Details of the Researcher

PHOTO

Masao Nakamura
Section
Graduate School of Science
Job title
Professor
Degree
e-Rad No.
50525780
Researcher ID
IXE-0113-2023

Research History 5

  • 2025/04 - Present
    Tohoku University　Graduate School of Science Department of Physics

  • 2014/04 - 2025/03
    理化学研究所　創発物性科学研究センター　上級研究員

  • 2016/10 - 2020/03
    科学技術振興機構 戦略的創造研究推進事業 さきがけ　研究員

  • 2008/01 - 2014/03
    理化学研究所　基幹研究所 交差相関超構造研究チー ム　基幹研究所研究員

  • 2005/04 - 2007/12
    産業技術総合研究所　強相関電子技術研究センター　科学技術振興機構 戦略的研究推進事業 「ナノテクデバイス」 研究チーム研究員

Education 3

  • 東京大学大学院　工学系研究科　物理工学専攻 博士課程

    2002/04 - 2005/03

  • The University of Tokyo　The Graduate School of Engineering　Department of Applied Physics

    2000/04 - 2002/03

  • The University of Tokyo　The Faculty of Engineering　Department of Applied Physics

    1996/04 - 2000/03

Professional Memberships 2

  • 日本物理学会

  • 応用物理学会

Research Interests 5

  • 強相関電子系

  • ハライド

  • 太陽電池

  • ヘテロ接合

  • 酸化物

Research Areas 3

  • Nanotechnology/Materials / Thin-film surfaces and interfaces /

  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Electronic devices and equipment /

  • Natural sciences / Magnetism, superconductivity, and strongly correlated systems /

Papers 91

  1. Record-high Glass coefficient in the shift current response of a ferroelectric halide perovskite Peer-reviewed

    Koma Miki, Masao Nakamura, Asahi Yamada, Gurvan Bosser, Kiyohiro Adachi, Daisuke Hashizume, Naoki Ogawa, Satoshi Okamoto, Yoshinori Tokura, Masashi Kawasaki

    Proceedings of the National Academy of Sciences　123　(26)　e2602252123　2026/06/22

    Publisher: National Academy of Sciences

    DOI： 10.1073/pnas.2602252123 　

    ISSN： 0027-8424

    eISSN： 1091-6490

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    Ferroelectric halide perovskites provide a fertile platform for optoelectronic functions based on the bulk photovoltaic effect, where broken inversion symmetry couples with quantum geometry of wave functions. The most prominent manifestation is the shift current, second-order nonlinear photocurrent arising from change in the Berry connection during optical transitions. Here we report a gigantic shift current response in epitaxial thin films of a lead-free ferroelectric halide perovskite CsGeI 3 . High-quality films grown by molecular beam epitaxy exhibit clear hallmarks of shift current, including spectral sign reversals, light-polarization dependence, and reversible electric-field modulation associated with switchable ferroelectric polarization. Remarkably, the normalized shift current magnitude surpasses those ever reported for other compounds by more than an order of magnitude, establishing a benchmark for bulk photovoltaic performance. These results identify ferroelectric halide perovskites as a powerful platform for exploring quantum-geometry-driven photoresponses and open a pathway toward next-generation photovoltaic and nonlinear optoelectronic technologies beyond the conventional junction-based architectures.

  2. Large terahertz photovoltaic effect enhanced by phonon excitations in ferroelectric semiconductor SbSI Peer-reviewed

    Yoshihiro Okamura, Guang-Yu Guo, Yoshio Kaneko, Masao Nakamura, Masato Sotome, Naoki Ogawa, Masashi Kawasaki, Yoshinori Tokura, Youtarou Takahashi

    Science Advances　12　(10)　eadw9796　2026/03/06

    Publisher: American Association for the Advancement of Science (AAAS)

    DOI： 10.1126/sciadv.adw9796 　

    eISSN： 2375-2548

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    Quantum geometry of Bloch electron in crystalline solids produces various exotic quantum phenomena. The shift current photovoltaic effect driven by the photo creation of quasiparticle is one such emerging example that enables the conversion from terahertz photon into dc charge current with absence of dissipative photocarrier. Despite wide-ranging potential applications, however, the fundamental nature of terahertz photovoltaic response has remained elusive. Here, we show the large photocurrent generation driven by terahertz phonons (<10 milli–electron volts) in ferroelectric semiconductor SbSI with the electronic bandgap of 2.3 electron volts. Zero-bias terahertz photocurrent is found to be resonantly enhanced by optical phonons. Its generation efficiency is larger than that for the direct interband transition and is comparable to the electronic shift current in Weyl semimetal TaAs. The theoretical scaling law of terahertz shift current and first-principles calculation reasonably explain these observations. The present work establishes the universality and high efficiency of phonon-driven shift current, opening the pathway to terahertz technology based on quantum geometry.

  3. Enhanced mobility of p-type transparent semiconductor CuI thin films grown on thermal expansion matched substrates Peer-reviewed

    Takahiro Yasunami, Masao Nakamura, Yoshinori Tokura, Masashi Kawasaki

    APL Materials　13　(8)　081121　2025/08/01

    Publisher: AIP Publishing

    DOI： 10.1063/5.0285140 　

    eISSN： 2166-532X

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    Cuprous iodide (CuI) is a promising p-type transparent conductor with high hole mobility and excellent optical transparency. However, its practical application is hindered by the significantly lower mobility observed in thin films compared to bulk crystals, which is primarily attributed to defects formed during the growth process. In thin-film systems, strain is another critical yet often overlooked factor influencing carrier transport. In this study, we examine the impact of strain arising from thermal expansion mismatch in epitaxial CuI films grown by molecular beam epitaxy on CaF2 and Al2O3 substrates. Films on CaF2, whose thermal expansion coefficient closely matches that of CuI, exhibit metallic conduction and a record-high mobility of 33.9 cm2 V−1 s−1 at 2 K. In contrast, films on Al2O3, with a much larger thermal mismatch, show lower mobility and insulating behavior. Exciton spectroscopy reveals that the thermal mismatch introduces structural disorder during the cooling process, which degrades carrier transport. These results highlight the crucial importance of strain engineering, particularly thermal expansion matching, for improving the performance of CuI thin films.

  4. Strongly enhanced shift current at exciton resonances in a noncentrosymmetric wide-gap semiconductor Peer-reviewed

    Masao Nakamura, Yang-Hao Chan, Takahiro Yasunami, Yi-Shiuan Huang, Guang-Yu Guo, Yajian Hu, Naoki Ogawa, Yiling Chiew, Xiuzhen Yu, Takahiro Morimoto, Naoto Nagaosa, Yoshinori Tokura, Masashi Kawasaki

    Nature Communications　15　(1)　9672　2024/11/16

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41467-024-53541-6 　

    eISSN： 2041-1723

  5. MT-pyrene-Based Conductive Radical Cation Salts: Crystal and Electronic Structure and Transport Properties International-journal Peer-reviewed

    Barun Dhara, Masao Nakamura, Kirill Bulgarevich, Kazuo Takimiya

    Crystal Growth & Design　24　(13)　5826-5833　2024/07/03

    DOI： 10.1021/acs.cgd.4c00689 　

  6. Bulk Photovoltaic Effect Along the Nonpolar Axis in Organic‐Inorganic Hybrid Perovskites Peer-reviewed

    Taishi Noma, Hsiao‐Yi Chen, Barun Dhara, Masato Sotome, Takuya Nomoto, Ryotaro Arita, Masao Nakamura, Daigo Miyajima

    Angewandte Chemie　135　(42)　2023/09/12

    Publisher: Wiley

    DOI： 10.1002/ange.202309055 　

    ISSN： 0044-8249

    eISSN： 1521-3757

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    Abstract The origin of the bulk photovoltaic effect (BPVE) was considered as a built‐in electric field formed by the macroscopic polarization of materials. Alternatively, the “shift current mechanism” has been gradually accepted as the more appropriate description of the BPVE. This mechanism implies that the photocurrent generated by the BPVE is a topological current featuring an ultrafast response and dissipation‐less nature, which is very attractive for photodetector applications. Meanwhile, the origin of the BPVE in organic–inorganic hybrid perovskites (OIHPs) has not been discussed and is still widely accepted as the classical mechanism without any experimental evidence. Herein, we observed the BPVE along the nonpolar axis in OIHPs, which is inconsistent with the classical explanation. Furthermore, based on the nonlinear optical tensor correlation, we substantiated that the BPVE in OIHPs is originated in the shift current mechanism.

  7. Bulk Photovoltaic Effect Along the Nonpolar Axis in Organic-Inorganic Hybrid Perovskites Peer-reviewed

    Taishi Noma, Hsiao-Yi Chen, Barun Dhara, Masato Sotome, Takuya Nomoto, Ryotaro Arita, Masao Nakamura, Daigo Miyajima

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION　2023/09

    DOI： 10.1002/anie.202309055 　

    ISSN： 1433-7851

    eISSN： 1521-3773

  8. Superconductivity at epitaxial LaTiO3-KTaO3 interfaces Peer-reviewed

    D. Maryenko, I. V. Maznichenko, S. Ostanin, M. Kawamura, K. S. Takahashi, M. Nakamura, V. K. Dugaev, E. Ya. Sherman, A. Ernst, M. Kawasaki

    APL MATERIALS　11　(6)　2023/06

    DOI： 10.1063/5.0151227 　

    ISSN： 2166-532X

  9. Crossover from strong to weak exciton confinement in thickness-controlled epitaxial PbI2 thin films Peer-reviewed

    Masao Nakamura, Ryuichi Namba, Takahiro Yasunami, Naoki Ogawa, Yoshinori Tokura, Masashi Kawasaki

    APPLIED PHYSICS LETTERS　122　(7)　2023/02

    DOI： 10.1063/5.0138536 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  10. Magnetic field control of insulator-metal crossover in cobaltite films via thermally activated percolation Peer-reviewed

    Meng Wang, Keisuke Matsuura, Masao Nakamura, Masahiro Sawada, Masashi Kawasaki, Fumitaka Kagawa

    Physical Review B　106　(15)　2022/10/19

    DOI： 10.1103/physrevb.106.155135 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  11. Band structures in orientation-controlled CuI thin films under epitaxial strain Peer-reviewed

    Masao Nakamura, Sotaro Inagaki, Yoshihiro Okamura, Makiko Ogino, Youtarou Takahashi, Kiyohiro Adachi, Daisuke Hashizume, Yoshinori Tokura, Masashi Kawasaki

    PHYSICAL REVIEW B　106　(12)　2022/09

    DOI： 10.1103/PhysRevB.106.125307 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  12. Photovoltaic effect by soft phonon excitation Peer-reviewed

    Yoshihiro Okamura, Takahiro Morimoto, Naoki Ogawa, Yoshio Kaneko, Guang-Yu Guo, Masao Nakamura, Masashi Kawasaki, Naoto Nagaosa, Yoshinori Tokura, Youtarou Takahashi

    PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA　119　(14)　2022/04

    DOI： 10.1073/pnas.2122313119 　

    ISSN： 0027-8424

    eISSN： 1091-6490

  13. Molecular beam epitaxy of two-dimensional semiconductor BiI3 films exhibiting sharp exciton absorption Peer-reviewed

    T. Yasunami, M. Nakamura, S. Inagaki, S. Toyoda, N. Ogawa, Y. Tokura, M. Kawasaki

    APPLIED PHYSICS LETTERS　119　(24)　2021/12

    DOI： 10.1063/5.0070762 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  14. Imaging the formation and surface phase separation of the CE phase Peer-reviewed

    Haibiao Zhou, Qiyuan Feng, Yubin Hou, Masao Nakamura, Yoshinori Tokura, Masashi Kawasaki, Zhigao Sheng, Qingyou Lu

    npj Quantum Materials　6　(1)　2021/12

    DOI： 10.1038/s41535-021-00353-2 　

    eISSN： 2397-4648

  15. Real-space observations of 60-nm skyrmion dynamics in an insulating magnet under low heat flow Peer-reviewed

    Xiuzhen Yu, Fumitaka Kagawa, Shinichiro Seki, Masashi Kubota, Jan Masell, Fehmi S. Yasin, Kiyomi Nakajima, Masao Nakamura, Masashi Kawasaki, Naoto Nagaosa, Yoshinori Tokura

    NATURE COMMUNICATIONS　12　(1)　2021/08

    DOI： 10.1038/s41467-021-25291-2 　

    ISSN： 2041-1723

  16. Terahertz emission spectroscopy of ultrafast exciton shift current in the noncentrosymmetric semiconductor CdS Peer-reviewed

    M. Sotome, M. Nakamura, T. Morimoto, Y. Zhang, G.-Y. Guo, M. Kawasaki, N. Nagaosa, Y. Tokura, N. Ogawa

    Physical Review B　103　(24)　2021/06/21

    DOI： 10.1103/physrevb.103.l241111 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  17. Denoising electron holograms using the wavelet hidden Markov model for phase retrieval-Applications to the phase-shifting method Peer-reviewed

    Takehiro Tamaoka, Yoshihiro Midoh, Kazuo Yamamoto, Shodai Aritomi, Toshiaki Tanigaki, Masao Nakamura, Koji Nakamae, Masashi Kawasaki, Yasukazu Murakami

    AIP ADVANCES　11　(2)　2021/02

    DOI： 10.1063/5.0027599 　

    eISSN： 2158-3226

  18. Kinetic pathway facilitated by a phase competition to achieve a metastable electronic phase Peer-reviewed

    Keisuke Matsuura, Hiroshi Oike, Vilmos Kocsis, Takuro Sato, Yasuhide Tomioka, Yoshio Kaneko, Masao Nakamura, Yasujiro Taguchi, Masashi Kawasaki, Yoshinori Tokura, Fumitaka Kagawa

    PHYSICAL REVIEW B　103　(4)　2021/01

    DOI： 10.1103/PhysRevB.103.L041106 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  19. Heteroepitaxial growth of wide bandgap cuprous iodide films exhibiting clear free-exciton emission Peer-reviewed

    S. Inagaki, M. Nakamura, Y. Okamura, M. Ogino, Y. Takahashi, L. C. Peng, X. Z. Yu, Y. Tokura, M. Kawasaki

    APPLIED PHYSICS LETTERS　118　(1)　2021/01

    DOI： 10.1063/5.0036862 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  20. Defect tolerant zero-bias topological photocurrent in a ferroelectric semiconductor Peer-reviewed

    Hiroki Hatada, Masao Nakamura, Masato Sotome, Yoshio Kaneko, Naoki Ogawa, Takahiro Morimoto, Yoshinori Tokura, Masashi Kawasaki

    PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA　117　(34)　20411-20415　2020/08

    DOI： 10.1073/pnas.2007002117 　

    ISSN： 0027-8424

  21. Molecular beam epitaxy of high-quality Cul thin films on a low temperature grown buffer layer Peer-reviewed

    S. Inagaki, M. Nakamura, N. Aizawa, L. C. Peng, X. Z. Yu, Y. Tokura, M. Kawasaki

    APPLIED PHYSICS LETTERS　116　(19)　2020/05

    DOI： 10.1063/5.0007389 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  22. Non-local photocurrent in a ferroelectric semiconductor SbSI under local photoexcitation Peer-reviewed

    M. Nakamura, H. Hatada, Y. Kaneko, N. Ogawa, M. Sotome, Y. Tokura, M. Kawasaki

    APPLIED PHYSICS LETTERS　116　(12)　2020/03

    DOI： 10.1063/5.0001524 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  23. Noncentrosymmetric Columnar Liquid Crystals with the Bulk Photovoltaic Effect for Organic Photodetectors Peer-reviewed

    Cheng Zhang, Kyohei Nakano, Masao Nakamura, Fumito Araoka, Keisuke Tajima, Daigo Miyajima

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY　142　(7)　3326-3330　2020/02

    DOI： 10.1021/jacs.9b12710 　

    ISSN： 0002-7863

    eISSN： 1520-5126

  24. Growth of visible-light-responsive ferroelectric SbSI thin films by molecular beam epitaxy Peer-reviewed

    S. Inagaki, M. Nakamura, H. Hatada, R. Nishino, F. Kagawa, Y. Tokura, M. Kawasaki

    APPLIED PHYSICS LETTERS　116　(7)　2020/02

    DOI： 10.1063/1.5142642 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  25. Strain-engineering of charge transport in the correlated Dirac semimetal of perovskite CaIrO3 thin films Peer-reviewed

    M. Masuko, J. Fujioka, M. Nakamura, M. Kawasaki, Y. Tokura

    APL MATERIALS　7　(8)　2019/08

    DOI： 10.1063/1.5109582 　

    ISSN： 2166-532X

  26. Ultrafast spectroscopy of shift-current in ferroelectric semiconductor Sn2P2S6 Peer-reviewed

    Sotome M, Nakamura M, Fujioka J, Ogino M, Kaneko Y, Morimoto T, Zhang Y, Kawasaki M, Nagaosa N, Tokura Y, Ogawa N

    APPLIED PHYSICS LETTERS　114　(15)　2019/04/15

    DOI： 10.1063/1.5087960 　

    ISSN： 0003-6951

  27. Disentangling transient charge order from structural dynamics contributions during coherent atomic motion studied by ultrafast resonant x-ray diffraction Peer-reviewed

    Rettig L, Caviezel A, Mariager S. O, Ingold G, Dornes C, Huang S-W, Johnson J. A, Radovic M, Huber T, Kubacka T, Ferrer A, Lemke H. T, Chollet M, Zhu D, Glownia J. M, Sikorski M, Robert A, Nakamura M, Kawasaki M, Tokura Y, Johnson S. L, Beaud P, Staub U

    PHYSICAL REVIEW B　99　(13)　2019/04/09

    DOI： 10.1103/PhysRevB.99.134302 　

    ISSN： 2469-9950

  28. Spectral dynamics of shift current in ferroelectric semiconductor SbSI Peer-reviewed

    Sotome M, Nakamura M, Fujioka J, Ogino M, Kaneko Y, Morimoto T, Zhang Y, Kawasaki M, Nagaosa N, Tokura Y, Ogawa N

    PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA　116　(6)　1929-1933　2019/02/05

    DOI： 10.1073/pnas.1802427116 　

    ISSN： 0027-8424

    eISSN： 1091-6490

  29. Current-Voltage Characteristic and Shot Noise of Shift Current Photovoltaics Peer-reviewed

    Morimoto Takahiro, Nakamura Masao, Kawasaki Masashi, Nagaosa Naoto

    PHYSICAL REVIEW LETTERS　121　(26)　2018/12/28

    DOI： 10.1103/PhysRevLett.121.267401 　

    ISSN： 0031-9007

  30. Impact of electrodes on the extraction of shift current from a ferroelectric semiconductor SbSI Peer-reviewed

    Nakamura M, Hatada H, Kaneko Y, Ogawa N, Tokura Y, Kawasaki M

    APPLIED PHYSICS LETTERS　113　(23)　2018/12/03

    DOI： 10.1063/1.5055692 　

    ISSN： 0003-6951

  31. Emergence of Topological Hall Effect in Half-Metallic Manganite Thin Films by Tuning Perpendicular Magnetic Anisotropy Peer-reviewed

    Masao Nakamura, Daisuke Morikawa, Xiuzhen Yu, Fumitaka Kagawa, Taka-hisa Arima, Yoshinori Tokura, Masashi Kawasaki

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　87　(7)　2018/07

    DOI： 10.7566/JPSJ.87.074704 　

    ISSN： 0031-9015

  32. Visualization of Electronic Multiple Ordering and Its Dynamics in High Magnetic Field: Evidence of Electronic Multiple Ordering Crystals Peer-reviewed

    Zhigao Sheng, Qiyuan Feng, Haibiao Zhou, Shuai Dong, Xueli Xu, Long Cheng, Caixing Liu, Yubin Hou, Wenjie Meng, Yuping Sun, Masao Nakamura, Yoshinori Tokura, Masashi Kawasaki, Qingyou Lu

    ACS Applied Materials and Interfaces　10　(23)　20136-20141　2018/06/13

    DOI： 10.1021/acsami.8b04057 　

    ISSN： 1944-8252 1944-8244

  33. Tensile-Strain-Dependent Spin States in Epitaxial LaCoO3 Thin Films Peer-reviewed

    Y. Yokoyama, Y. Yamasaki, M. Taguchi, Y. Hirata, K. Takubo, J. Miyawaki, Y. Harada, D. Asakura, J. Fujioka, M. Nakamura, H. Daimon, M. Kawasaki, Y. Tokura, H. Wadati

    Physical Review Letters　120　(20)　2018/05/17

    DOI： 10.1103/PhysRevLett.120.206402 　

    ISSN： 1079-7114 0031-9007

  34. Photoinduced transitions in magnetoresistive manganites: A comprehensive view Peer-reviewed

    V. Esposito, L. Rettig, E. Abreu, E. M. Bothschafter, G. Ingold, M. Kawasaki, M. Kubli, G. Lantz, M. Nakamura, J. Rittman, M. Savoini, Y. Tokura, U. Staub, S. L. Johnson, P. Beaud

    Physical Review B　97　(1)　2018/01/31

    DOI： 10.1103/PhysRevB.97.014312 　

    ISSN： 2469-9969 2469-9950

  35. Shift current photovoltaic effect in a ferroelectric charge-transfer complex Peer-reviewed

    M. Nakamura, S. Horiuchi, F. Kagawa, N. Ogawa, T. Kurumaji, Y. Tokura, M. Kawasaki

    NATURE COMMUNICATIONS　8　6　2017/08

    DOI： 10.1038/s41467-017-00250-y 　

    ISSN： 2041-1723

  36. Nonlinear Electron-Phonon Coupling in Doped Manganites Peer-reviewed

    V. Esposito, M. Fechner, R. Mankowsky, H. Lemke, M. Chollet, J. M. Glownia, M. Nakamura, M. Kawasaki, Y. Tokura, U. Staub, P. Beaud, M. Foerst

    PHYSICAL REVIEW LETTERS　118　(24)　2017/06

    DOI： 10.1103/PhysRevLett.118.247601 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  37. Current-Induced Nucleation and Annihilation of Magnetic Skyrmions at Room Temperature in a Chiral Magnet Peer-reviewed

    Xiuzhen Yu, Daisuke Morikawa, Yusuke Tokunaga, Masashi Kubota, Takashi Kurumaji, Hiroshi Oike, Masao Nakamura, Fumitaka Kagawa, Yasujiro Taguchi, Taka-hisa Arima, Masashi Kawasaki, Yoshinori Tokura

    ADVANCED MATERIALS　29　(21)　6　2017/06

    DOI： 10.1002/adma.201606178 　

    ISSN： 0935-9648

    eISSN： 1521-4095

  38. Spontaneous Polarization and Bulk Photovoltaic Effect Driven by Polar Discontinuity in LaFeO3/SrTiO3 Heterojunctions Peer-reviewed

    M. Nakamura, F. Kagawa, T. Tanigaki, H. S. Park, T. Matsuda, D. Shindo, Y. Tokura, M. Kawasaki

    PHYSICAL REVIEW LETTERS　116　(15)　2016/04

    DOI： 10.1103/PhysRevLett.116.156801 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  39. Surface Ordering of Orbitals at a Higher Temperature in LaCoO3 Thin Film Peer-reviewed

    Yuichi Yamasaki, Jun Fujioka, Hironori Nakao, Jun Okamoto, Takaaki Sudayama, Youichi Murakami, Masao Nakamura, Masashi Kawasaki, Takahisa Arima, Yoshinori Tokura

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　85　(2)　2016/03

    DOI： 10.7566/JPSJ.85.023704 　

    ISSN： 0031-9015

  40. Current-induced creation of magnetic skyrmion lattice at room temperature

    Yu X.Z., Morikawa D., Tokunaga Y., Kubota M., Oike H., Kurumaji T., Nakamura M., Kagawa F., Taguchi Y., Arima T-H., Kawasaki M., Tokura Y.

    Meeting Abstracts of the Physical Society of Japan　71　717-717　2016

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.71.2.0_717 　

  41. Direct Imaging of Dynamic Glassy Behavior in a Strained Manganite Film Peer-reviewed

    Worasom Kundhikanjana, Zhigao Sheng, Yongliang Yang, Keji Lai, Eric Yue Ma, Yong-Tao Cui, Michael A. Kelly, Masao Nakamura, Masashi Kawasaki, Yoshinori Tokura, Qiaochu Tang, Kun Zhang, Xinxin Li, Zhi-Xun Shen

    PHYSICAL REVIEW LETTERS　115　(26)　2015/12

    DOI： 10.1103/PhysRevLett.115.265701 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  42. Thermal Generation of Spin Current in an Antiferromagnet Peer-reviewed

    S. Seki, T. Ideue, M. Kubota, Y. Kozuka, R. Takagi, M. Nakamura, Y. Kaneko, M. Kawasaki, Y. Tokura

    PHYSICAL REVIEW LETTERS　115　(26)　2015/12

    DOI： 10.1103/PhysRevLett.115.266601 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  43. Strain-sensitive spin-state ordering in thin films of perovskite LaCoO3 Peer-reviewed

    J. Fujioka, Y. Yamasaki, A. Doi, H. Nakao, R. Kumai, Y. Murakami, M. Nakamura, M. Kawasaki, T. Arima, Y. Tokura

    PHYSICAL REVIEW B　92　(19)　2015/11

    DOI： 10.1103/PhysRevB.92.195115 　

    ISSN： 1098-0121

    eISSN： 1550-235X

  44. Band alignment and photovoltaic effect of epitaxial alpha-PbO thin films Peer-reviewed

    Eishi Majima, Yusuke Kozuka, Masaki Uchida, Masao Nakamura, Masashi Kawasaki

    APPLIED PHYSICS EXPRESS　8　(7)　2015/07

    DOI： 10.7567/APEX.8.074001 　

    ISSN： 1882-0778

    eISSN： 1882-0786

  45. Perovskite LaRhO3 as a p-type active layer in oxide photovoltaics Peer-reviewed

    Masao Nakamura, Yoshiharu Krockenberger, Jun Fujioka, Masashi Kawasaki, Yoshinori Tokura

    APPLIED PHYSICS LETTERS　106　(7)　2015/02

    DOI： 10.1063/1.4909512 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  46. 17pCG-1 Spin current generation from Mn oxide

    Kondou K., Nakamura M., Idzuchi H., Matsuno J., Fukuma Y., Kawasaki M., Tokura Y., Otani Y.

    Meeting Abstracts of the Physical Society of Japan　70　881-881　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.2.0_881 　

    ISSN： 2189-079X

  47. 21aAD-10 Spin current generation with antiferromagnets

    Seki S., Ideue T., Kubota M., Kozuka Y., Nakamura M., Kaneko Y., Kawasaki M., Tokura Y.

    Meeting Abstracts of the Physical Society of Japan　70　963-963　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.1.0_963 　

    ISSN： 2189-079X

  48. A time-dependent order parameter for ultrafast photoinduced phase transitions Peer-reviewed

    P. Beaud, A. Caviezel, S. O. Mariager, L. Rettig, G. Ingold, C. Dornes, S-W. Huang, J. A. Johnson, M. Radovic, T. Huber, T. Kubacka, A. Ferrer, H. T. Lemke, M. Chollet, D. Zhu, J. M. Glownia, M. Sikorski, A. Robert, H. Wadati, M. Nakamura, M. Kawasaki, Y. Tokura, S. L. Johnson, U. Staub

    NATURE MATERIALS　13　(10)　923-927　2014/10

    DOI： 10.1038/NMAT4046 　

    ISSN： 1476-1122

    eISSN： 1476-4660

  49. Magneto-tunable photocurrent in manganite-based heterojunctions Peer-reviewed

    Z. G. Sheng, M. Nakamura, W. Koshibae, T. Makino, Y. Tokura, M. Kawasaki

    NATURE COMMUNICATIONS　5　2014/08

    DOI： 10.1038/ncomms5584 　

    ISSN： 2041-1723

  50. Orbital correlations and dimensional crossover in epitaxial Pr0.5Ca0.5MnO3/La0.5Sr0.5MnO3 superlattices Peer-reviewed

    H. Wadati, J. Okamoto, M. Garganourakis, V. Scagnoli, U. Staub, E. Sakai, H. Kumigashira, T. Sugiyama, E. Ikenaga, M. Nakamura, M. Kawasaki, Y. Tokura

    NEW JOURNAL OF PHYSICS　16　2014/07

    DOI： 10.1088/1367-2630/16/7/073044 　

    ISSN： 1367-2630

  51. Gate Control of Percolative Conduction in Strongly Correlated Manganite Films Peer-reviewed

    Takafumi Hatano, Zhigao Sheng, Masao Nakamura, Masaki Nakano, Masashi Kawasaki, Yoshihiro Iwasa, Yoshinori Tokura

    ADVANCED MATERIALS　26　(18)　2874-2877　2014/05

    DOI： 10.1002/adma.201304813 　

    ISSN： 0935-9648

    eISSN： 1521-4095

  52. Revealing orbital and magnetic phase transitions in Pr0.5Ca0.5MnO3 epitaxial thin films by resonant soft x-ray scattering Peer-reviewed

    H. Wadati, J. Geck, E. Schierle, R. Sutarto, F. He, D. G. Hawthorn, M. Nakamura, M. Kawasaki, Y. Tokura, G. A. Sawatzky

    NEW JOURNAL OF PHYSICS　16　2014/03

    DOI： 10.1088/1367-2630/16/3/033006 　

    ISSN： 1367-2630

  53. A detailed view of an ultrafast phase transition using femtosecond resonant x-ray diffraction Peer-reviewed

    Beaud P, Caviezel A, Mariager S.O, Rettig L, Ingold G, Dornes C, Huang S.-W, Johnson J.A, Radovic M, Huber T, Kubacka T, Ferrer A, Lemke H.T, Chollet M, Zhu D, Glownia J.M, Sikorski M, Robert A, Wadati H, Nakamura M, Kawasaki M, Tokura Y, Johnson S.L, Staub U

    Optics InfoBase Conference Papers　2014

  54. Enhanced second-harmonic generation in Pr0.5Ca0.5MnO3/La0.5Sr0.5MnO3 superlattices Peer-reviewed

    J. S. Lee, M. Nakamura, M. Kawasaki, Y. Tokura

    APPLIED PHYSICS LETTERS　103　(25)　2013/12

    DOI： 10.1063/1.4851237 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  55. Imprinting Magnetic Information in Manganites with X Rays Peer-reviewed

    M. Garganourakis, V. Scagnoli, S. W. Huang, U. Staub, H. Wadati, M. Nakamura, V. A. Guzenko, M. Kawasaki, Y. Tokura

    PHYSICAL REVIEW LETTERS　109　(15)　2012/10

    DOI： 10.1103/PhysRevLett.109.157203 　

    ISSN： 0031-9007

  56. E g-Level splitting in a layered perovskite manganite as revealed by charge modulation spectroscopy Peer-reviewed

    Masao Nakamura, Masashi Kawasaki, Yoshinori Tokura

    Physical Review B - Condensed Matter and Materials Physics　86　(12)　2012/09/18

    DOI： 10.1103/PhysRevB.86.125127 　

    ISSN： 1098-0121 1550-235X

  57. e(g)-level splitting in a layered perovskite manganite as revealed by charge modulation spectroscopy Peer-reviewed

    Masao Nakamura, Masashi Kawasaki, Yoshinori Tokura

    PHYSICAL REVIEW B　86　(12)　2012/09

    DOI： 10.1103/PhysRevB.86.125127 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  58. Dynamics of multiple phases in a colossal-magnetoresistive manganite as revealed by dielectric spectroscopy Peer-reviewed

    Zhigao Sheng, Masao Nakamura, Fumitaka Kagawa, Masashi Kawasaki, Yoshinori Tokura

    NATURE COMMUNICATIONS　3　2012/07

    DOI： 10.1038/ncomms1943 　

    ISSN： 2041-1723

  59. Nature of the coexisting phase in YMnO3 thin films revealed by soft and hard x-ray diffraction studies Peer-reviewed

    H. Wadati, J. Okamoto, M. Garganourakis, V. Scagnoli, U. Staub, Y. Yamasaki, H. Nakao, Y. Murakami, M. Nakamura, M. Kawasaki, Y. Tokura

    Phys. Rev. Lett.　108　047203　2012/01

    DOI： 10.1103/PhysRevLett.108.047203 　

  60. Origin of the Large Polarization in Multiferroic YMnO3 Thin Films Revealed by Soft- and Hard-X-Ray Diffraction Peer-reviewed

    H. Wadati, J. Okamoto, M. Garganourakis, V. Scagnoli, U. Staub, Y. Yamasaki, H. Nakao, Y. Murakami, M. Mochizuki, M. Nakamura, M. Kawasaki, Y. Tokura

    PHYSICAL REVIEW LETTERS　108　(4)　2012/01

    DOI： 10.1103/PhysRevLett.108.047203 　

    ISSN： 0031-9007

  61. Photocarrier collection from depletion layer of LaMnO3 Peer-reviewed

    J. Fujioka, M. Nakamura, M. Kawasaki, Y. Tokura

    JOURNAL OF APPLIED PHYSICS　111　(1)　2012/01

    DOI： 10.1063/1.3677790 　

    ISSN： 0021-8979

  62. Interfacial Structure of Manganite Superlattice Peer-reviewed

    Yoshihiro Yamasaki, Daisuke Okuyama, Masao Nakamura, Taka-hisa Arima, Masashi Kawasaki, Yoshinori Tokura, Tsuyoshi Kimura, Yusuke Wakabayashi

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　80　(7)　2011/07

    DOI： 10.1143/JPSJ.80.073601 　

    ISSN： 0031-9015

  63. Multiferroicity in an orthorhombic YMnO3 single-crystal film Peer-reviewed

    Masao Nakamura, Yusuke Tokunaga, Masashi Kawasaki, Yoshinori Tokura

    APPLIED PHYSICS LETTERS　98　(8)　2011/02

    DOI： 10.1063/1.3555462 　

    ISSN： 0003-6951

  64. Transient photoinduced 'hidden' phase in a manganite Peer-reviewed

    Hirohiko Ichikawa, Shunsuke Nozawa, Tokushi Sato, Ayana Tomita, Kouhei Ichiyanagi, Matthieu Chollet, Laurent Guerin, Nicky Dean, Andrea Cavalleri, Shin-ichi Adachi, Taka-hisa Arima, Hiroshi Sawa, Yasushi Ogimoto, Masao Nakamura, Ryo Tamaki, Kenjiro Miyano, Shin-ya Koshihara

    NATURE MATERIALS　10　(2)　101-105　2011/02

    DOI： 10.1038/nmat2929 　

    ISSN： 1476-1122

    eISSN： 1476-4660

  65. Interface band profiles of Mott-insulator/Nb : SrTiO3 heterojunctions as investigated by optical spectroscopy Peer-reviewed

    Masao Nakamura, Akihito Sawa, Jun Fujioka, Masashi Kawasaki, Yoshinori Tokura

    PHYSICAL REVIEW B　82　(20)　2010/11

    DOI： 10.1103/PhysRevB.82.201101 　

    ISSN： 1098-0121

  66. The essentials for the control of charge-orbital ordering in thin films of perovskite manganites Peer-reviewed

    Yasushi Ogimoto, Masao Nakamura, Nobutaka Harada, Naoki Ogawa, Kenjiro Miyano

    MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS　173　(1-3)　51-56　2010/10

    DOI： 10.1016/j.mseb.2010.02.009 　

    ISSN： 0921-5107

    eISSN： 1873-4944

  67. Competing electronic orders in anisotropically strained (Pr0.6Ca0.4)(1-x)(La0.6Sr0.4)(x)MnO3 thin films Peer-reviewed

    J. S. Lee, M. Nakamura, D. Okuyama, R. Kumai, T. Arima, M. Kawasaki, Y. Tokura

    PHYSICAL REVIEW B　82　(5)　2010/08

    DOI： 10.1103/PhysRevB.82.052406 　

    ISSN： 1098-0121

  68. Growth of superconducting Sr2RuO4 thin films Peer-reviewed

    Y. Krockenberger, M. Uchida, K. S. Takahashi, M. Nakamura, M. Kawasaki, Y. Tokura

    APPLIED PHYSICS LETTERS　97　(8)　2010/08

    DOI： 10.1063/1.3481363 　

    ISSN： 0003-6951

  69. Mesoscopic Percolating Resistance Network in a Strained Manganite Thin Film Peer-reviewed

    Keji Lai, Masao Nakamura, Worasom Kundhikanjana, Masashi Kawasaki, Yoshinori Tokura, Michael A. Kelly, Zhi-Xun Shen

    SCIENCE　329　(5988)　190-193　2010/07

    DOI： 10.1126/science.1189925 　

    ISSN： 0036-8075

  70. Little volume change in orbital ordering transition in manganite thin films Peer-reviewed

    Wakabayashi, Yusuke, Sawa, Hiroshi, Takubo, Naoko, Nakamura, Masao, Ogimoto, Yasushi, Miyano, Kenjiro, Bruckel, T, Schweika, W, Tonnerre, JM

    Polarized Neutrons and Synchrotron X-Rays For Magnetism Conference 2009　211　2010

    DOI： 10.1088/1742-6596/211/1/012004 　

  71. Magnetically Tunable Metal-Insulator Superlattices Peer-reviewed

    Masao Nakamura, Daisuke Okuyama, Jong Seok Lee, Taka-hisa Arima, Yusuke Wakabayashi, Reiji Kumai, Masashi Kawasaki, Yoshinori Tokura

    ADVANCED MATERIALS　22　(4)　500-+　2010/01

    DOI： 10.1002/adma.200902734 　

    ISSN： 0935-9648

  72. Epitaxial-strain effect on charge/orbital order in Pr0.5Ca0.5MnO3 films Peer-reviewed

    D. Okuyama, M. Nakamura, Y. Wakabayashi, H. Itoh, R. Kumai, H. Yamada, Y. Taguchi, T. Arima, M. Kawasaki, Y. Tokura

    APPLIED PHYSICS LETTERS　95　(15)　2009/10

    DOI： 10.1063/1.3246158 　

    ISSN： 0003-6951

  73. Size of orbital-ordering domain controlled by the itinerancy of the 3d electrons in a manganite thin film Peer-reviewed

    Y. Wakabayashi, H. Sagayama, T. Arima, M. Nakamura, Y. Ogimoto, Y. Kubo, K. Miyano, H. Sawa

    PHYSICAL REVIEW B　79　(22)　2009/06

    DOI： 10.1103/PhysRevB.79.220403 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  74. Orbital ordering structures in (Nd,Pr)(0.5)Sr0.5MnO3 manganite thin films on perovskite (011) substrates Peer-reviewed

    Yusuke Wakabayashi, Daisuke Bizen, Yugo Kubo, Hironori Nakao, Youichi Murakami, Masao Nakamura, Yasushi Ogimoto, Kenjiro Miyano, Hiroshi Sawa

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　77　(1)　2008/01

    DOI： 10.1143/JPSJ.77.014712 　

    ISSN： 0031-9015

  75. Optical probe of electrostatic-doping in an n-type Mott insulator Peer-reviewed

    M. Nakamura, A. Sawa, H. Sato, H. Akoh, M. Kawasaki, Y. Tokura

    PHYSICAL REVIEW B　75　(15)　2007/04

    DOI： 10.1103/PhysRevB.75.155103 　

    ISSN： 1098-0121

  76. Orbital ordered structure of a manganite thin film observed by K-edge resonant X-ray scattering Peer-reviewed

    Y. Wakabayashi, D. Bizen, H. Nakao, Y. Murakami, M. Nakamura, Y. Ogimoto, K. Miyano, H. Sawa

    SYNCHROTRON RADIATION INSTRUMENTATION, PTS 1 AND 2　879　1711-+　2007

    DOI： 10.1063/1.2436399 　

    ISSN： 0094-243X

  77. Ultrafast photoinduced magnetic moment in a charge-orbital-ordered antiferromagnetic Nd0.5Sr0.5MnO3 thin film Peer-reviewed

    K. Miyasaka, M. Nakamura, Y. Ogimoto, H. Tamaru, K. Miyano

    PHYSICAL REVIEW B　74　(1)　2006/07

    DOI： 10.1103/PhysRevB.74.012401 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  78. Novel orbital ordering induced by anisotropic stress in a manganite thin film Peer-reviewed

    Wakabayashi, Y, Bizen, D, Nakao, H, Murakami, Y, Nakamura, M, Ogimoto, Y, Miyano, K, Sawa, H

    Physical Review Letters　96　(1)　2006

    DOI： 10.1103/PhysRevLett.96.017202 　

  79. Dimensional crossover in transport property in manganite thin films with finely controlled lattice distortion Peer-reviewed

    M Nakamura, M Izumi, K Miyano

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　74　(12)　3387-3390　2005/12

    DOI： 10.1143/JPSJ.74.3387 　

    ISSN： 0031-9015

  80. Critical phase control of the charge-orbital ordered manganite thin films Peer-reviewed

    Y Ogimoto, M Nakamura, N Takubo, H Tamaru, M Izumi, K Miyano

    THIN SOLID FILMS　486　(1-2)　104-107　2005/08

    DOI： 10.1016/j.tsf.2004.11.213 　

    ISSN： 0040-6090

  81. Persistent and reversible all-optical phase control in a manganite thin film Peer-reviewed

    N Takubo, Y Ogimoto, M Nakamura, H Tamaru, M Izumi, K Miyano

    PHYSICAL REVIEW LETTERS　95　(1)　2005/07

    DOI： 10.1103/PhysRevLett.95.017404 　

    ISSN： 0031-9007

  82. Phase control through anisotropic strain in Nd0.5Sr0.5MnO3 thin films Peer-reviewed

    M Nakamura, Y Ogimoto, H Tamaru, N Izumi, K Miyano

    APPLIED PHYSICS LETTERS　86　(18)　2005/05

    DOI： 10.1063/1.1923754 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  83. Pseudomorphic strain effect on the charge-orbital ordering pattern in Pr0.5Sr0.5MnO3 epitaxial thin films Peer-reviewed

    Y Ogimoto, N Takubo, M Nakamura, H Tamaru, M Izumi, K Miyano

    APPLIED PHYSICS LETTERS　86　(11)　2005/03

    DOI： 10.1063/1.1885191 　

    ISSN： 0003-6951

  84. Strain-induced crossover of the metal-insulator transition in perovskite manganites Peer-reviewed

    Y Ogimoto, M Nakamura, N Takubo, H Tamaru, M Izumi, K Miyano

    PHYSICAL REVIEW B　71　(6)　2005/02

    DOI： 10.1103/PhysRevB.71.060403 　

    ISSN： 1098-0121

  85. Antiferromagnetic coupling in ferromagnetic oxide trilayer films composed of Sr0.7Ca0.3RuO3 and La0.6Sr0.4MnO3 Peer-reviewed

    Y Uozu, T Nakajima, M Nakamura, Y Ogimoto, M Izumi, K Miyano

    APPLIED PHYSICS LETTERS　85　(14)　2875-2877　2004/10

    DOI： 10.1063/1.1800284 　

    ISSN： 0003-6951

  86. Relative contributions of lattice distortion and Coulomb interaction to resonant X-ray scattering in manganites Peer-reviewed

    M Nakamura, M Izumi, N Ogawa, H Ohsumi, Y Wakabayashi, K Miyano

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　73　(10)　2802-2806　2004/10

    DOI： 10.1143/JPSJ.73.2802 　

    ISSN： 0031-9015

  87. Lack of influence of anisotropic electron clouds on resonant x-ray scattering from manganite thin films Peer-reviewed

    Y. Wakabayashi, H. Sawa, M. Nakamura, M. Izumi, K. Miyano

    Physical Review B - Condensed Matter and Materials Physics　69　(14)　1-144414　2004/04

    DOI： 10.1103/PhysRevB.69.144414 　

    ISSN： 0163-1829

  88. Lack of influence of anisotropic electron clouds on resonant x-ray scattering from manganite thin films Peer-reviewed

    Y Wakabayashi, H Sawa, M Nakamura, M Izumi, K Miyano

    PHYSICAL REVIEW B　69　(14)　2004/04

    DOI： 10.1103/PhysRevB.69.144414 　

    ISSN： 1098-0121

  89. Diffuse phase transition and magnetic-domain microstructures in a Cr-doped manganite thin film Peer-reviewed

    H Oshima, Y Ishihara, M Nakamura, K Miyano

    PHYSICAL REVIEW B　63　(9)　2001/03

    ISSN： 1098-0121

    eISSN： 1550-235X

  90. Persistent photoconductivity in a ferromagnetic-metallic state of a Cr-doped manganite thin film Peer-reviewed

    H Oshima, M Nakamura, K Miyano

    PHYSICAL REVIEW B　63　(7)　2001/02

    ISSN： 2469-9950

    eISSN： 2469-9969

  91. Persistent photoconductivity in a ferromagnetic-metallic state of a Cr-doped manganite thin film

    Hirotaka Oshima, Masao Nakamura, Kenjiro Miyano

    Physical Review B - Condensed Matter and Materials Physics　63　(7)　2001/01/30

    DOI： 10.1103/PhysRevB.63.075111 　

    ISSN： 1098-0121

    eISSN： 1550-235X

Show all ︎Show first 5

Misc. 4

  1. Shift current: A quantum-mechanical photovoltaic effect in noncentrosymmetric crystals. Peer-reviewed

    中村優男, 五月女真人, 小川直毅, 川崎雅司, 川崎雅司

    応用物理　90　(2)　98-102　2021

    ISSN： 0369-8009

  2. Bulk Photovoltaic Effect: A Modern View and Possible Applications

    Masao Nakamura and Masashi Kawasaki

    AAPPS Bulletin　30　(4)　22-28　2020

  3. Shift Current: Quantum Mechanical Picture of the Bulk Photovoltaic Effect Peer-reviewed

    Ogawa Naoki, Sotome Masato, Nakamura Masao, Morimoto Takahiro

    Butsuri　75　(3)　154-159　2020

    Publisher: The Physical Society of Japan

    DOI： 10.11316/butsuri.75.3_154 　

    ISSN： 0029-0181

    More details Close

    <p>When a photon induces an interband transition in a solid, the excited electron (hole) experiences a spatial shift if the crystal lacks an inversion symmetry, leading to a generation of directional photocurrent. This phenomenon has been known as bulk or anomalous photovoltaic effect for years, and is recently reformulated with the viewpoint of quantum mechanics as the change in the geometrical phase upon photoexcitation. It is also predicted that this so-called shift current of electron (hole) can be less-dissipative and ultrafast. We demonstrate the emergence of shift current in several organic and inorganic ferroelectrics by using extensive optical spectroscopies, whose excitation spectra nicely compared to the ones from first-principles band calculations.</p>

  4. Spin Superstructures in Thin Films of Correlated Electron Systems Peer-reviewed

    NAKAMURA Masao, KAWASAKI Masashi, TOKURA Yoshinori

    J. Surf. Sci. Soc. Jpn.　32　(3)　128-133　2011

    Publisher: The Surface Science Society of Japan

    DOI： 10.1380/jsssj.32.128 　

    ISSN： 0388-5321

    More details Close

    Realizing an electronic phase competition in a material is a promising approach to induce a large electronic change by a small external field. One of typical materials showing the phase competition is the half-doped perovskite manganite, in which the ground state drastically changes between the antiferromagnetic-insulating (AFM-I) and ferromagnetic-metallic (FM-M) states depending on the slight difference in the band width. Near the phase boundary, the two phases coexist and compete with each other, giving rise to a gigantic field response like the colossal magnetoresistance. We show in this paper the observation of a self-organized anisotropic phase separation with use of a microwave impedance microscope for a thin film of Nd0.5Sr0.5MnO3, which locates on the verge of the phase boundary. We also show an artificially tailored phase separation and its magnetic control realized in superlattices composed of Pr0.5Ca0.5MnO3 (AFM-I) and La0.5Sr0.5MnO3 (FM-M).

Presentations 24

  1. Temperature-Programmable Bulk Photovoltaic Effect in Ionic Intramolecular Charge Transfer Complexes

    Gurvan Bosser, Justin Llandro, Naoki Ogawa, Masao Nakamura, Yoshinori Tokura, Satoshi Okamoto

    2026/03/18

  2. Photocurrent with a quantum geometric origin in halide semiconductor thin films Invited

    Masao Nakamura

    JPS symposium : Recent progress in topological matters　2025/09/16

  3. エピタキシャル薄膜成長で拓くハライドの光電子物性の新展開 Invited

    中村優男

    2025年度 理研RAP & 東北大学 第1回連携ワークショップ　2025/07/29

  4. 引張歪みを導入した CuI 薄膜におけるシフト電流観測

    松田 優馬, 中村 優男, 川﨑 雅司

    2025年第72回応用物理学会春季学術講演会　2025/03/16

  5. 分子線エピタキシー法で作製したCsGeI3高品質薄膜のシフト電流

    三木 孝馬, 中村 優男, 小川 直毅, 十倉 好紀, 川﨑 雅司

    2025年第72回応用物理学会春季学術講演会　2025/03/16

  6. Exciton-enhanced nonlinear photocurrent response in halide heterostructures International-presentation Invited

    Masao Nakamura

    Topological Nonlinear Optics in Quantum Materials　2025/02/21

  7. Gigantic exciton shift current observed in MBE-grown CuI thin films

    2024/03/25

  8. New photovoltaic functionalities and exciton physics opened by shift current Invited

    Masao Nakamura

    2024/03/21

  9. Direct observation of exciton shift current in a noncentrosymmetric widegap semiconductor

    Masao Nakamura, Takahiro Yasunami, Yang-Hao Chan, Yi-Shiuang Huang, Guang-Yu Guo, Yajian Hu, Naoki Ogawa, Yiling Chiew, Xiuzhen Yu, Takahiro Morimoto, Naoto Nagaosa, Yoshinori Tokura, Masashi Kawasaki

    APS March Meeting　2024/03/04

  10. Gigantic exciton shift current in a noncentrosymmetric widegap semiconductor

    Masao Nakamura, Takahiro Yasunami, Yang-Hao Chan, Yi-Shiuang Huang, Guang-Yu Guo, Yajian Hu, Naoki Ogawa, Yiling Chiew, Xiuzhen Yu, Takahiro Morimoto, Naoto Nagaosa, Yoshinori Tokura, Masashi Kawasaki

    CEMS symposium on Emergent Quantum Materials 2024　2024/02/22

  11. フッ化物基板上の エピタキシャルCuI薄膜における格子整合の影響

    米虫 遼太郎, 中村 優男, 安波 貴広, 十倉 好紀, 川﨑 雅司

    第84回 応用物理学会秋季学術講演会　2023/09/21

  12. MBE成長したCuI薄膜における金属的な低温伝導特性の観測

    安波 貴広, 中村 優男, 小川 直毅, 十倉 好紀, 川﨑 雅司

    2023年 第70回応用物理学会 春季学術講演会　2023/03/17

  13. 膜厚制御されたPbI2薄膜における二次元励起子閉じ込め効果

    中村 優男, 難波 隆一, 安波 貴広, 小川 直毅, 十倉 好紀, 川﨑 雅司

    2023年 第70回応用物理学会 春季学術講演会　2023/03/17

  14. 配向制御したCuI薄膜における 歪み誘起バンド構造変化

    中村 優男, 稲垣 宗太朗, 岡村 嘉大, 荻野 槙子, 高橋 陽太郎, 足立 精宏, 橋爪 大輔, 十倉 好紀, 川﨑 雅司

    2022年 第83回応用物理学会 秋季学術講演会　2022/09/20

  15. 分子性結晶における非線形光電流応答 Invited

    中村優男

    日本物理学会 第77回年次大会「分子性結晶におけるトポロジカル物性の展開」　2022/03/18

  16. Nonlinear photocurrent generation in halide and organic polar semiconductors

    Masao Nakamura

    CEMS Topical Online Meeting “Nonlinear electric and optical responses in quantum materials”　2022/03/03

  17. 量子位相に駆動される低散逸で高速応答の シフト電流光電変換 Invited

    中村優男

    分子研研究会「エネルギー科学の最前線：階層横断的な理解に向けて」　2022/02/28

  18. 量子力学的位相に駆動されるシフト電流の実験検証 Invited

    中村優男

    東京工業大学 量子物理学・ナノサイエンス第329 回セミナー　2022/01/07

  19. Shift current of topological origin in polar semiconductors Invited

    Masao Nakamura

    Material Research Meeting 2021　2021/12/15

  20. Molecular beam epitaxy of single-crystalline iodide films toward the development of halide electronics Invited

    Masao Nakamura

    Annual Meeting and Status Seminar of DFG Research Group FOR2857 “Copper Iodide as Multifunctional Semiconductor“　2021/09/30

  21. 層状化合物BiI3薄膜のエピタキシャル成長と光学特性評価

    安波 貴広, 中村 優男, 稲垣 宗太朗, 豊田 新悟, 小川 直毅, 十倉 好紀, 川﨑 雅司

    第82回応用物理学会秋季学術講演会　2021/09/13

  22. Extremely sharp free exciton emission in heteroepitaxial cuprous iodide thin films grown by MBE

    M. Nakamura, S. Inagaki, Y. Okamura, M. Ogino, Y. Takahashi, L. C. Peng, X. Z. Yu, Y. Tokura, M. Kawasaki

    2021 Virtual MRS Spring Meeting　2021/04/19

  23. ヘテロエピタキシャル成長したCuI 単結晶薄膜における自由励起子発光

    稲垣宗太朗, 中村優男, 岡村嘉大, 荻野槙子, 高橋陽太郎, Licong Peng, Xiuzhen Yu, 十倉好紀, 川﨑雅司

    第68回応用物理学会春季学術講演会　2021/03/18

  24. 大きな電子分極を持つ有機・ハライド 強誘電体における低散逸で高速応答のシフト電流発生 Invited

    中村優男

    第5回 分子性固体オンラインセミナー　2021/01/19

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Industrial Property Rights 3

  1. 光電変換素子、光センサ、発電装置、及び光電変換方法

    中村 優男, 川崎 雅司, 十倉 好紀, 永長 直人, 森本 高裕, 金子 良夫

    Property Type: Patent

  2. 磁気素子、スキルミオンメモリ、スキルミオンメモリ搭載固体電子デバイス、データ記録装置、データ処理装置及び通信装置

    中村 優男, 松野 丈夫, 川崎 雅司, 十倉 好紀, 金子 良夫

    Property Type: Patent

  3. 太陽電池

    小椎八重, 中村 優男, 川崎 雅司, 永長 直人, 田口 康二郎, 十倉 好紀, 古川 信夫

    Property Type: Patent

Research Projects 7

  1. Chimera Quasiparticles:Molecular Science

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Transformative Research Areas (A)

    Institution: Tokyo Institute of Technology

    2024/04 - 2029/03

  2. 三方晶系極性有機結晶の構築とバルク光起電流効果デバイスへの応用

    瀧宮 和男, 川畑 公輔, 中村 優男

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 挑戦的研究(開拓)

    Institution: 国立研究開発法人理化学研究所

    2025/06/27 - 2028/03/31

  3. Development of metal halide X-nics in high-quality single-crystalline thin films and interfaces

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)

    Category: Grant-in-Aid for Scientific Research (S)

    Institution: The University of Tokyo

    2022/04 - 2027/03

  4. Demonstration of shift current photovoltaic response in high-quality thin films of halide ferroelectrics

    Nakamura Masao

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Institute of Physical and Chemical Research

    2020/04 - 2023/03

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    Materials with broken inversion symmetry exhibit photocurrent driven by quantum-mechanical phase, called shift current. However, experimental demonstration of shift current in thin-film device structures has been lacking. In this study, we target halide ferroelectric semiconductors, which have large spontaneous polarization and strong optical absorption in the visible light range, and demonstrate photovoltaic conversion by shift current mechanism in thin film samples. We first prepared high-quality thin films of ferroelectric halide semiconductors with well-defined polarization axes by molecular beam epitaxy. Then, we successfully observed shift current response in the thin-film device structure. The observed current was found to be enhanced by several orders of magnitude compared to that in bulk samples.

  5. バルク光起電力効果による光電変換プロセスの機構解明と高効率化に向けた新材料開拓 Competitive

    中村 優男

    Offer Organization: 科学技術振興機構

    System: さきがけ

    2016/10 - 2020/03

  6. Farbrication of polar superstructures to develop new photovoltaic materials

    Nakamura Masao

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (A)

    Category: Grant-in-Aid for Young Scientists (A)

    Institution: Institute of Physical and Chemical Research

    2015/04 - 2017/03

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    The bulk photovoltaic effect observed in polar materials has a potential to be a photon-to-electron conversion mechanism to realize novel high efficiency solar cells. In this study, I investigated photovoltaic properties of heterojunctions composed of LaFeO3 and SrTiO3. Due to the polar discontinuity at the interface, the originally nonpolar insulator LaFeO3 becomes polar. The junctions exhibit anomalous photovoltaic properties driven by the induced polarization, such as the reversal of the sign of photocurrent depending on the thickness and interfacial termination layer. The photovoltaic efficiency of the LaFeO3 junctions exhibits large improvement compared to other Mott insulator junctions due to the bulk photovoltaic effect associated with the induced polarization.

  7. Artificial phase separated structure of charge- and magnetic-order in oxide superlattices

    NAKAMURA Masao

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

    Category: Grant-in-Aid for Young Scientists (B)

    Institution: The Institute of Physical and Chemical Research

    2009 - 2010

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    Artificial superlattices composed of two perovskite-type manganites with slightly different chemical compositions were fabricated by depositing each composition alternatively in a nanometer-scale. The two compositions have contrastive electronic phases, a ferromagnetic-metal and antiferromagnetic- insulator. It was revealed that the superlattices are in phase-coexisting state from transport and magnetic properties, optical spectra, and results of synchrotron x-ray diffraction. The resistivity and magnetization of the superlattice could be continuously tuned by a magnetic field or electric field as a result of the displacement of the electronic phase boundaries by the external fields.

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Social Activities 2

  1. 光を分解してみよう！ 太陽電池と色の世界

    ぶらりがく for You

    2025/12/07 -

  2. 電子の波がひらく物質科学の世界― 半導体から日本発祥の太陽電池まで ―

    東京都立小松川高等学校 大学模擬講義

    2025/10/08 -