Details of the Researcher

PHOTO

Tomoki Ozawa
Section
Advanced Institute for Materials Research
Job title
Professor
Degree

  • Ｐｈ．Ｄ．（イリノイ大学）

  • Ｍ．Ｓ．（イリノイ大学）

Research History 9

  • 2025/04 - Present
    Tohoku University　Advanced Institute for Materials Research　Deputy Director

  • 2024/04 - Present
    Tohoku University　Advanced Institute for Materials Research　Professor

  • 2020/02 - 2024/03
    Tohoku University　Advanced Institute for Materials Research　Associate Professor

  • 2019/10 - 2022/03
    JST PRESTO researcher (concurrent)

  • 2018/04 - 2020/01
    RIKEN　iTHEMS　Senior Research Scientist

  • 2018/01 - 2018/03
    Free University of Bruxelles　Physics of Complex Systems　Postdoctoral Researcher

  • 2015/04 - 2017/12
    University of Trento, BEC Center　Senior Postdoctoral Researcher

  • 2012/09 - 2015/03
    University of Trento, BEC Center　Postdoctoral Researcher

  • 2012/06 - 2012/08
    University of Illinois at Urbana-Champaign　Department of Physics　Postdoctoral Researcher

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Education 2

  • University of Illinois at Urbana-Champaign　Department of Physics

    2006/08 - 2012/05

  • The University of Tokyo　Faculty of Science　Department of Physics

    2002/04 - 2006/03

Committee Memberships 2

  • トヨタコンポン研究所　研究アドバイザー

    2024/04 - Present

  • American Physical Society　Editorial Board Member for Physical Review A

    2023/01 - 2025/12

Professional Memberships 2

  • American Physical Society

  • THE PHYSICAL SOCIETY OF JAPAN

Research Interests 5

  • Topological phases

  • Photonics

  • Ultracold atomic gas

  • Atomic, molecular, and optical physics

  • Condensed matter theory

Research Areas 2

  • Natural sciences / Semiconductors, optical and atomic physics /

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

Awards 11

  1. 丸文研究奨励賞

    2024/03　丸文財団

  2. 晝馬輝夫 光科学賞

    2024/03　光科学技術研究振興財団

  3. Asian Young Scientist Fellowship

    2023/10

  4. Tohoku University Distinguished Researcher

    2021/05　Tohoku University

  5. The Young Scientists' Award, The Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology

    2021/04　MEXT

  6. Young Scientist Award, 2021 (Division 1)

    2021/03　The Physical Society of Japan

  7. Ohbu Research Incentive Award

    2020/03　RIKEN

  8. Outstanding Referee

    2017　American Physical Society

  9. Vijay R. Pandharipande Prize in Nuclear Physics

    2012　University of Illinois at Urbana-Champaign

  10. Excellence in Teaching Award

    2010　University of Illinois at Urbana-Champaign

  11. Excellence in Teaching Award

    2006　University of Illinois at Urbana-Champaign

Show all ︎Show 5

Papers 81

  1. Geometric contribution to adiabatic amplification in non-Hermitian systems Peer-reviewed

    Tomoki Ozawa, Henning Schomerus

    Physical Review Research　7　(1)　2025/02/18

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevresearch.7.013173 　

    eISSN： 2643-1564

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    Concepts from non-Hermitian quantum mechanics have proven useful in understanding and manipulating a variety of classical systems, such as those encountered in optics, classical mechanics, and metamaterial design. Recently, the non-Hermitian analog of the Berry phase for adiabatic processes was experimentally measured. In non-Hermitian systems, the Berry phase can have an imaginary part, which contributes to the amplification or decay of the total wave intensity. When the imaginary part of the Berry curvature is zero, this geometric amplification factor is determined solely by the initial and final points of the adiabatic path in parameter space, and it does not depend on how these points are connected by the path. We list classes of non-Hermitian Hamiltonians where this path independence is guaranteed by suitable symmetries, and we find that, for some of these classes, the amplification factor can be written only in terms of the Petermann factors of the initial and final points. Our result can, in turn, be used to experimentally obtain the Petermann factor by observing how the norm of the wave function changes under adiabatic processes. We validate our theory using a couple of concrete examples of physical relevance. Published by the American Physical Society 2025

  2. Interaction-driven breakdown of Aharonov–Bohm caging in flat-band Rydberg lattices Peer-reviewed

    Tao Chen, Chenxi Huang, Ivan Velkovsky, Tomoki Ozawa, Hannah Price, Jacob P. Covey, Bryce Gadway

    Nature Physics　21　(2)　221-227　2025/01/10

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41567-024-02714-7 　

    ISSN： 1745-2473

    eISSN： 1745-2481

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    Abstract Flat bands in condensed matter systems can host emergent states of matter, from insulating states in twisted bilayer graphene to fractionalized excitations in frustrated magnets and quantum Hall materials. A key phenomenon in certain flat-band systems is Aharonov–Bohm caging, where particles become localized due to destructive interference caused by gauge fields. Here we report on the experimental realization of highly tunable flat-band models populated by strongly interacting Rydberg atoms. By employing synthetic dimensions, we engineer a flat-band rhombic lattice with twisted boundaries and explore the control of Aharonov–Bohm caging during non-equilibrium dynamics through a tunable gauge field. Microscopic measurements of Rydberg pairs reveal the interaction-driven breakdown of Aharonov–Bohm caging in the limit of strong dipolar interactions, where lattice bands mix. In the limit of weak interactions, where caging persists, we observe effective magnetism arising from the interaction-driven mixing of degenerate flat-band states. These observations offer insights into emergent phenomena in synthetic quantum materials and expand our understanding of quantum many-body physics in engineered lattice systems.

  3. Relating the Hall conductivity to the many-body Chern number using Fermi’s Golden rule and Kramers–Kronig relations Peer-reviewed

    Nathan Goldman, Tomoki Ozawa

    Comptes Rendus. Physique　25　(G1)　289-302　2024/09/05

    Publisher: Cellule MathDoc/Centre Mersenne

    DOI： 10.5802/crphys.191 　

    eISSN： 1878-1535

  4. Uniqueness of Landau levels and their analogs with higher Chern numbers Peer-reviewed

    Bruno Mera, Tomoki Ozawa

    Physical Review Research　6　(3)　2024/09/03

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevresearch.6.033238 　

    eISSN： 2643-1564

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    Landau levels are the eigenstates of a charged particle in two dimensions under a magnetic field and are at the heart of the integer and fractional quantum Hall effects, which are two prototypical phenomena showing topological features. Following recent discoveries of fractional quantum Hall phases in van der Waals materials, there is a rapid progress in understanding of the precise condition under which the fractional quantum Hall phases can be stabilized. It is now understood that the key to obtaining the fractional quantum Hall phases is the energy band whose eigenstates are holomorphic functions in both real and momentum space coordinates. Landau levels are indeed examples of such energy bands with an additional special property of having flat geometrical features. In this paper, we prove that, in fact, the only energy eigenstates having holomorphic wave functions with a flat geometry are the Landau levels and their higher Chern number analogs. Since it has been known that any holomorphic eigenstates can be constructed from the ones with a flat geometry such as the Landau levels, our uniqueness proof of the Landau levels allows one to construct any possible holomorphic eigenstate with which the fractional quantum Hall phases can be stabilized. Published by the American Physical Society 2024

  5. Bulk-entanglement spectrum correspondence in PT- and PC-symmetric topological insulators and superconductors Peer-reviewed

    Ryo Takahashi, Tomoki Ozawa

    Physical Review Research　6　(3)　2024/08/21

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevresearch.6.033192 　

    eISSN： 2643-1564

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    In this study, we discuss a type of bulk-boundary correspondence, which holds for topological insulators and superconductors when the parity-time (PT) and/or parity-particle-hole (PC) symmetry are present. In these systems, even when the bulk topology is nontrivial, the edge spectrum is generally gapped, and thus the conventional bulk-boundary correspondence does not hold. We find that, instead of the edge spectrum, the single-particle entanglement spectrum becomes gapless when the bulk topology is nontrivial: i.e., the holds in PT- and/or PC-symmetric topological insulators and superconductors. After showing the correspondence using K-theoretic approach, we provide concrete models for each symmetry class up to three dimensions where nontrivial topology because of PT and/or PC is expected. An implication of our results is that, when the bulk topology under PT and/or PC symmetry is nontrivial, the noninteracting many-body entanglement spectrum is multiply degenerate in one dimension and is gapless in two or higher dimensions. Published by the American Physical Society 2024

  6. Mean-chiral displacement in coherently driven photonic lattices and its application to synthetic frequency dimensions Peer-reviewed

    Greta Villa, Iacopo Carusotto, Tomoki Ozawa

    Communications Physics　7　(1)　2024/07/17

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s42005-024-01727-1 　

    eISSN： 2399-3650

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    Abstract Characterizing topologically nontrivial photonic lattices by measuring their topological invariants is crucial in topological photonics. In conservative one-dimensional systems, a widely used observable to extract the winding number is the mean-chiral displacement. In many realistic photonic systems, however, losses can hardly be avoided, and little is known on how one can extend the mean-chiral displacement to a driven-dissipative context. Here we theoretically propose an experimentally viable method to directly detect the topological winding number of one-dimensional chiral photonic lattices. The method we propose is a generalization of the mean-chiral displacement to a driven-dissipative context with coherent illumination. By integrating the mean-chiral displacement of the steady state over the pump light frequency, one can obtain the winding number with a correction of the order of the loss rate squared. We demonstrate that this method can be successfully applied to lattices along synthetic frequency dimensions.

  7. Reconfigurable synthetic dimension frequency lattices in an integrated lithium niobate ring cavity Peer-reviewed

    Hiep X. Dinh, Armandas Balčytis, Tomoki Ozawa, Yasutomo Ota, Guanghui Ren, Toshihiko Baba, Satoshi Iwamoto, Arnan Mitchell, Thach G. Nguyen

    Communications Physics　7　(1)　2024/06/11

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s42005-024-01676-9 　

    eISSN： 2399-3650

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    Abstract Harnessing non-spatial properties of photons as if they represent an additional independent coordinate underpins the emerging synthetic dimension approach. It enables probing of higher-dimensional physical models within low-dimensional devices, such as on a planar chip where this method is relatively nascent. We demonstrate an integrated thin-film lithium niobate ring resonator that, under dynamic modulation, simulates a tight-binding model with its discrete frequency modes representing lattice sites. Inter-mode coupling, and the simulated lattice geometry, can be reconfigured by controlling the modulating signals. Up to a quasi-3D lattice connectivity with controllable gauge potentials has been achieved by simultaneous synchronized nearest-, second- and third-nearest-neighbor coupling, and verified by acquiring synthetic band structures. Development of synthetic frequency dimension devices in the thin-film lithium niobate photonic integration platform is a key step in increasing the complexity of topological models achievable on a chip, combining efficient electro-optic mode coupling with non-linear effects for long-range mode interactions.

  8. Two-dimensional lattice with an imaginary magnetic field Peer-reviewed

    Tomoki Ozawa, Tomoya Hayata

    Physical Review B　109　(8)　2024/02/08

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevb.109.085113 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  9. Density Dependent Gauge Field Inducing Emergent Su-Schrieffer-Heeger Physics, Solitons, and Condensates in a Discrete Nonlinear Schrödinger Equation Peer-reviewed

    W. N. Faugno, Mario Salerno, Tomoki Ozawa

    Physical Review Letters　132　(2)　2024/01/08

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevlett.132.023401 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  10. Drude weight and the many-body quantum metric in one-dimensional Bose systems Peer-reviewed

    G. Salerno, T. Ozawa, P. Törmä

    Physical Review B　108　(14)　2023/10/11

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevb.108.l140503 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  11. Measuring the adiabatic non-Hermitian Berry phase in feedback-coupled oscillators Peer-reviewed

    Yaashnaa Singhal, Enrico Martello, Shraddha Agrawal, Tomoki Ozawa, Hannah Price, Bryce Gadway

    Physical Review Research　5　(3)　2023/08/24

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevresearch.5.l032026 　

    eISSN： 2643-1564

  12. Bulk-edge correspondence of Stiefel-Whitney and Euler insulators through the entanglement spectrum and cutting procedure Peer-reviewed

    Ryo Takahashi, Tomoki Ozawa

    Physical Review B　108　(7)　2023/08/11

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevb.108.075129 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  13. Edge-to-edge topological spectral transfer in diamond photonic lattices Peer-reviewed

    Gabriel Cáceres-Aravena, Bastián Real, Diego Guzmán-Silva, Paloma Vildoso, Ignacio Salinas, Alberto Amo, Tomoki Ozawa, Rodrigo A. Vicencio

    APL Photonics　8　(8)　2023/08/01

    Publisher: AIP Publishing

    DOI： 10.1063/5.0153770 　

    eISSN： 2378-0967

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    The transfer of information between topological edge states is a robust way of spatially manipulating spatial states in lattice environments. This method is particularly efficient when the edge modes are kept within the topological gap of the lattice during the transfer. In this work, we show experimentally the transfer of photonic modes between topological edge states located at opposite ends of a dimerized one-dimensional photonic lattice. We use a diamond lattice of coupled waveguides and show that the topological transfer is insensitive to the presence of a high density of states in the form of a flat band at an energy close to that of the edge states and prevails in the presence of a hopping impurity. We explore the dynamics in the waveguide lattice using a wavelength-scan method, where different input wavelengths translate into different effective lattice lengths. Our results offer an alternative way to the implementation of efficient transfer protocols based on active driving mechanisms.

  14. Synthetic mechanical lattices with synthetic interactions Peer-reviewed

    Ritika Anandwade, Yaashnaa Singhal, Sai Naga Manoj Paladugu, Enrico Martello, Michael Castle, Shraddha Agrawal, Ellen Carlson, Cait Battle-McDonald, Tomoki Ozawa, Hannah M. Price, Bryce Gadway

    Physical Review A　108　(1)　2023/07/28

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physreva.108.012221 　

    ISSN： 2469-9926

    eISSN： 2469-9934

  15. Coexistence of stable and unstable population dynamics in a nonlinear non-Hermitian mechanical dimer Peer-reviewed

    Enrico Martello, Yaashnaa Singhal, Bryce Gadway, Tomoki Ozawa, Hannah M. Price

    Physical Review E　107　(6)　2023/06/26

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physreve.107.064211 　

    ISSN： 2470-0045

    eISSN： 2470-0053

  16. 人工量子系の物性物理とトポロジカル物性 Invited

    小澤知己

    第67回物性若手夏の学校 講義ノート　188　2023/02

  17. Singular-connection approach to topological phases and resonant optical responses Peer-reviewed

    Bruno Mera, Tomoki Ozawa

    Physical Review B　106　(24)　2022/12/20

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevb.106.245134 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  18. Quantum Fisher information measurement and verification of the quantum Cramér–Rao bound in a solid-state qubit Peer-reviewed

    Min Yu, Yu Liu, Pengcheng Yang, Musang Gong, Qingyun Cao, Shaoliang Zhang, Haibin Liu, Markus Heyl, Tomoki Ozawa, Nathan Goldman, Jianming Cai

    npj Quantum Information　8　(1)　2022/12

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41534-022-00547-x 　

    eISSN： 2056-6387

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    Abstract The quantum Cramér–Rao bound sets a fundamental limit on the accuracy of unbiased parameter estimation in quantum systems, relating the uncertainty in determining a parameter to the inverse of the quantum Fisher information. We experimentally demonstrate near saturation of the quantum Cramér–Rao bound in the phase estimation of a solid-state spin system, provided by a nitrogen-vacancy center in diamond. This is achieved by comparing the experimental uncertainty in phase estimation with an independent measurement of the related quantum Fisher information. The latter is independently extracted from coherent dynamical responses of the system under weak parametric modulations, without performing any quantum-state tomography. While optimal parameter estimation has already been observed for quantum devices involving a limited number of degrees of freedom, our method offers a versatile and powerful experimental tool to explore the Cramér–Rao bound and the quantum Fisher information in systems of higher complexity, as relevant for quantum technologies.

  19. Interaction-Induced Non-Hermitian Topological Phases from a Dynamical Gauge Field Peer-reviewed

    W. N. Faugno, Tomoki Ozawa

    Physical Review Letters　129　(18)　2022/10/24

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevlett.129.180401 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  20. Roadmap on topological photonics Peer-reviewed

    Hannah Price, Yidong Chong, Alexander Khanikaev, Henning Schomerus, Lukas J Maczewsky, Mark Kremer, Matthias Heinrich, Alexander Szameit, Oded Zilberberg, Yihao Yang, Baile Zhang, Andrea Alù, Ronny Thomale, Iacopo Carusotto, Philippe St-Jean, Alberto Amo, Avik Dutt, Luqi Yuan, Shanhui Fan, Xuefan Yin, Chao Peng, Tomoki Ozawa, Andrea Blanco-Redondo

    Journal of Physics: Photonics　4　(3)　032501-032501　2022/07/01

    Publisher: IOP Publishing

    DOI： 10.1088/2515-7647/ac4ee4 　

    eISSN： 2515-7647

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    Abstract Topological photonics seeks to control the behaviour of the light through the design of protected topological modes in photonic structures. While this approach originated from studying the behaviour of electrons in solid-state materials, it has since blossomed into a field that is at the very forefront of the search for new topological types of matter. This can have real implications for future technologies by harnessing the robustness of topological photonics for applications in photonics devices. This roadmap surveys some of the main emerging areas of research within topological photonics, with a special attention to questions in fundamental science, which photonics is in an ideal position to address. Each section provides an overview of the current and future challenges within a part of the field, highlighting the most exciting opportunities for future research and developments.

  21. Band structures under non-Hermitian periodic potentials: Connecting nearly-free and bi-orthogonal tight-binding models Peer-reviewed

    Ken Mochizuki, Tomoki Ozawa

    Physical Review B　105　(17)　2022/05/19

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevb.105.174108 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  22. Synthetic dimension band structures on a Si CMOS photonic platform Peer-reviewed

    Armandas Balčytis, Tomoki Ozawa, Yasutomo Ota, Satoshi Iwamoto, Jun Maeda, Toshihiko Baba

    Science Advances　8　(4)　2022/01/28

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

    DOI： 10.1126/sciadv.abk0468 　

    eISSN： 2375-2548

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    Synthetic dimensions, which simulate spatial coordinates using nonspatial degrees of freedom, are drawing interest in topological science and other fields for modeling higher-dimensional phenomena on simple structures. We present the first realization of a synthetic frequency dimension on a silicon ring resonator integrated photonic device fabricated using a CMOS process. We confirm that its coupled modes correspond to a one-dimensional tight-binding model through acquisition of up to 280-GHz bandwidth optical frequency comb-like spectra and by measuring synthetic band structures. Furthermore, we realized two types of gauge potentials along the frequency dimension and probed their effects through the associated band structures. An electric field analog was produced via modulation detuning, whereas effective magnetic fields were induced using synchronized nearest- and second nearest–neighbor couplings. Creation of coupled mode lattices and two effective forces on a monolithic Si CMOS device represents a key step toward wider adoption of topological principles.

  23. Author Correction: Lasing in topological edge states of a one-dimensional lattice

    P. St-Jean, V. Goblot, E. Galopin, A. Lemaître, T. Ozawa, L. Le Gratiet, I. Sagnes, J. Bloch, A. Amo

    Nature Photonics　15　(11)　862-862　2021/07/07

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41566-021-00846-3 　

    ISSN： 1749-4885

    eISSN： 1749-4893

  24. Photonic Topological Materials: feature introduction Invited

    Tomoki Ozawa, Ramy El-Ganainy, Alberto Amo

    Optical Materials Express　11　(6)　1592-1592　2021/06/01

    Publisher: The Optical Society

    DOI： 10.1364/ome.430428 　

    ISSN： 2159-3930

    eISSN： 2159-3930

  25. Spatial and spectral mode-selection effects in topological lasers with frequency-dependent gain Peer-reviewed

    Secl{\`i}, M., Ozawa, T., Capone, M., Carusotto, I.

    APL Photonics　6　(5)　050803-050803　2021/05/01

    Publisher: AIP Publishing

    DOI： 10.1063/5.0041124 　

    ISSN： 2378-0967

    eISSN： 2378-0967

  26. Artificial magnetic field for synthetic quantum matter without dynamical modulation Peer-reviewed

    Ozawa, T.

    Physical Review A　103　(3)　2021/03/19

    Publisher: American Physical Society (APS)

    DOI： 10.1103/PhysRevA.103.033318 　

    ISSN： 2469-9934 2469-9926

    eISSN： 2469-9934

  27. Relations between topology and the quantum metric for Chern insulators Peer-reviewed

    Ozawa, T., Mera, B.

    Physical Review B　104　(4)　2021

    DOI： 10.1103/PhysRevB.104.045103 　

    ISSN： 2469-9969 2469-9950

  28. Engineering geometrically flat Chern bands with Fubini-Study Kähler structure Peer-reviewed

    Mera, B., Ozawa, T.

    Physical Review B　104　(11)　2021

    DOI： 10.1103/PhysRevB.104.115160 　

    ISSN： 2469-9969 2469-9950

  29. Kähler geometry and Chern insulators: Relations between topology and the quantum metric KÄHLER GEOMETRY and CHERN INSULATORS: ... BRUNO MERA and TOMOKI OZAWA Peer-reviewed

    Mera, B., Ozawa, T.

    Physical Review B　104　(4)　2021

    DOI： 10.1103/PhysRevB.104.045104 　

    ISSN： 2469-9969 2469-9950

  30. Erratum: Photonic topological materials feature issue (Optical Materials Express (2021) 11:4 (1119) DOI: 10.1364/OME.427194)

    Amo, A., Ozawa, T., El-Ganainy, R.

    Optical Materials Express　11　(5)　1410-1410　2021

    DOI： 10.1364/OME.11.001410 　

    ISSN： 2159-3930

  31. Direct observation of photonic Landau levels and helical edge states in strained honeycomb lattices Peer-reviewed

    Jamadi, O., Rozas, E., Salerno, G., Mili?evi?, M., Ozawa, T., Sagnes, I., Lema{\^i}tre, A., Le Gratiet, L., Harouri, A., Carusotto, I., Bloch, J., Amo, A.

    Light: Science and Applications　9　(1)　2020/12

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41377-020-00377-6 　

    ISSN： 2047-7538 2095-5545

    eISSN： 2047-7538

  32. Semi-Dirac Transport and Anisotropic Localization in Polariton Honeycomb Lattices Peer-reviewed

    Real, B., Jamadi, O., Mili?evi?, M., Pernet, N., St-Jean, P., Ozawa, T., Montambaux, G., Sagnes, I., Lema{\^i}tre, A., Le Gratiet, L., Harouri, A., Ravets, S., Bloch, J., Amo, A.

    Physical Review Letters　125　(18)　2020/10/28

    Publisher: American Physical Society (APS)

    DOI： 10.1103/PhysRevLett.125.186601 　

    ISSN： 1079-7114 0031-9007

    eISSN： 1079-7114

  33. Synthetic dimensions and topological chiral currents in mesoscopic rings Peer-reviewed

    Price, H.M., Ozawa, T., Schomerus, H.

    Physical Review Research　2　(3)　2020/07/16

    Publisher: American Physical Society (APS)

    DOI： 10.1103/PhysRevResearch.2.032017 　

    ISSN： 2643-1564

    eISSN： 2643-1564

  34. 人工次元を用いたトポロジカル物性の研究 Invited Peer-reviewed

    小澤知己

    日本物理学会誌　75　(4)　201　2020/04

  35. Experimental measurement of the quantum geometric tensor using coupled qubits in diamond Peer-reviewed

    Yu, M., Yang, P., Gong, M., Cao, Q., Lu, Q., Liu, H., Zhang, S., Plenio, M.B., Jelezko, F., Ozawa, T., Goldman, N., Cai, J.

    National Science Review　7　(2)　254-260　2020/02/01

    Publisher: Oxford University Press (OUP)

    DOI： 10.1093/nsr/nwz193 　

    ISSN： 2053-714X 2095-5138

    eISSN： 2053-714X

  36. Active topological photonics Peer-reviewed

    Yasutomo Ota, Kenta Takata, Tomoki Ozawa, Alberto Amo, Zhetao Jia, Boubacar Kante, Masaya Notomi, Yasuhiko Arakawa, Satoshi Iwamoto

    Nanophotonics　9　(3)　547-567　2020/01/28

    Publisher: Walter de Gruyter GmbH

    DOI： 10.1515/nanoph-2019-0376 　

    ISSN： 2192-8614

    eISSN： 2192-8614

  37. Probing localization and quantum geometry by spectroscopy Peer-reviewed

    Ozawa, T., Goldman, N.

    Physical Review Research　1　(3)　032019(R)　2019/11

    DOI： 10.1103/PhysRevResearch.1.032019 　

    ISSN： 2643-1564

  38. Exploring topological photonics in synthetic dimensions

    Hannah M. Price, Tomoki Ozawa, Nathan Goldman, Oded Zilberberg, Iacopo Carusotto

    2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019　2019/06/01

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/CLEOE-EQEC.2019.8872904 　

  39. Topological and geometrical effects in the bulk hall response of driven-dissipative photonic lattices

    Tomoki Ozawa, Iacopo Carusotto

    2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019　2019/06/01

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/CLEOE-EQEC.2019.8873225 　

  40. Type-III and Tilted Dirac Cones Emerging from Flat Bands in Photonic Orbital Graphene Peer-reviewed

    Mili?evi?, M., Montambaux, G., Ozawa, T., Jamadi, O., Real, B., Sagnes, I., Lema{\^i}tre, A., Le Gratiet, L., Harouri, A., Bloch, J., Amo, A.

    Physical Review X　9　(3)　031010　2019

    DOI： 10.1103/PhysRevX.9.031010 　

    ISSN： 2160-3308

  41. Topological quantum matter in synthetic dimensions Invited Peer-reviewed

    Ozawa, T., Price, H.M.

    Nature Reviews Physics　1　(5)　349-357　2019

    DOI： 10.1038/s42254-019-0045-3 　

    ISSN： 2522-5820

  42. Measuring quantized circular dichroism in ultracold topological matter Peer-reviewed

    Asteria, L., Tran, D.T., Ozawa, T., Tarnowski, M., Rem, B.S., Fl{\"a}schner, N., Sengstock, K., Goldman, N., Weitenberg, C.

    Nature Physics　15　(5)　449-454　2019

    DOI： 10.1038/s41567-019-0417-8 　

    ISSN： 1745-2481 1745-2473

  43. Topological photonics Invited Peer-reviewed

    Ozawa, T., Price, H.M., Amo, A., Goldman, N., Hafezi, M., Lu, L., Rechtsman, M.C., Schuster, D., Simon, J., Zilberberg, O., Carusotto, I.

    Reviews of Modern Physics　91　(1)　015006　2019

    DOI： 10.1103/RevModPhys.91.015006 　

    ISSN： 1539-0756 0034-6861

  44. Steady-state Hall response and quantum geometry of driven-dissipative lattices Peer-reviewed

    Ozawa, T.

    Physical Review B　97　(4)　041108(R)　2018

    DOI： 10.1103/PhysRevB.97.041108 　

    ISSN： 2469-9969 2469-9950

  45. Extracting the quantum metric tensor through periodic driving Peer-reviewed

    Ozawa, T., Goldman, N.

    Physical Review B　97　(20)　201117(R)　2018

    DOI： 10.1103/PhysRevB.97.201117 　

    ISSN： 2469-9969 2469-9950

  46. Lasing in topological edge states of a one-dimensional lattice Peer-reviewed

    P. St-Jean, V. Goblot, E. Galopin, A. Lemaitre, T. Ozawa, L. Le Gratiet, I. Sagnes, J. Bloch, A. Amo

    NATURE PHOTONICS　11　(10)　651-+　2017/10

    DOI： 10.1038/s41566-017-0006-2 　

    ISSN： 1749-4885

    eISSN： 1749-4893

  47. Klein tunneling in driven-dissipative photonic graphene Peer-reviewed

    Tomoki Ozawa, Alberto Amo, Jacqueline Bloch, Iacopo Carusotto

    PHYSICAL REVIEW A　96　(1)　2017/07

    DOI： 10.1103/PhysRevA.96.013813 　

    ISSN： 2469-9926

    eISSN： 2469-9934

  48. Propagating edge states in strained honeycomb lattices Peer-reviewed

    Grazia Salerno, Tomoki Ozawa, Hannah M. Price, Iacopo Carusotto

    PHYSICAL REVIEW B　95　(24)　2017/06

    DOI： 10.1103/PhysRevB.95.245418 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  49. Spin-orbit coupling in a hexagonal ring of pendula Peer-reviewed

    Grazia Salerno, Alice Berardo, Tomoki Ozawa, Hannah M. Price, Ludovic Taxis, Nicola M. Pugno, Iacopo Carusotto

    NEW JOURNAL OF PHYSICS　19　(5)　2017/05

    DOI： 10.1088/1367-2630/aa6c03 　

    ISSN： 1367-2630

  50. Orbital Edge States in a Photonic Honeycomb Lattice Peer-reviewed

    M. Milicevic, T. Ozawa, G. Montambaux, I. Carusotto, E. Galopin, A. Lemaitre, L. Le Gratiet, I. Sagnes, J. Bloch, A. Amo

    PHYSICAL REVIEW LETTERS　118　(10)　2017/03

    DOI： 10.1103/PhysRevLett.118.107403 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  51. Synthetic dimensions for cold atoms from shaking a harmonic trap Peer-reviewed

    Hannah M. Price, Tomoki Ozawa, Nathan Goldman

    PHYSICAL REVIEW A　95　(2)　2017/02

    DOI： 10.1103/PhysRevA.95.023607 　

    ISSN： 2469-9926

    eISSN： 2469-9934

  52. Synthetic Dimensions with Magnetic Fields and Local Interactions in Photonic Lattices Peer-reviewed

    Tomoki Ozawa, Iacopo Carusotto

    PHYSICAL REVIEW LETTERS　118　(1)　2017/01

    DOI： 10.1103/PhysRevLett.118.013601 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  53. Optical-lattice-assisted magnetic phase transition in a spin-orbit-coupled Bose-Einstein condensate Peer-reviewed

    Giovanni I. Martone, Tomoki Ozawa, Chunlei Qu, Sandro Stringari

    PHYSICAL REVIEW A　94　(4)　2016/10

    DOI： 10.1103/PhysRevA.94.043629 　

    ISSN： 2469-9926

    eISSN： 2469-9934

  54. Measurement of Chern numbers through center-of-mass responses Peer-reviewed

    H. M. Price, O. Zilberberg, T. Ozawa, I. Carusotto, N. Goldman

    PHYSICAL REVIEW B　93　(24)　2016/06

    DOI： 10.1103/PhysRevB.93.245113 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  55. Quantum Hall effect in momentum space Peer-reviewed

    Tomoki Ozawa, Hannah M. Price, Iacopo Carusotto

    PHYSICAL REVIEW B　93　(19)　2016/05

    DOI： 10.1103/PhysRevB.93.195201 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  56. Synthetic dimensions in integrated photonics: From optical isolation to four-dimensional quantum Hall physics Peer-reviewed

    Tomoki Ozawa, Hannah M. Price, Nathan Goldman, Oded Zilberberg, Iacopo Carusotto

    PHYSICAL REVIEW A　93　(4)　2016/04

    DOI： 10.1103/PhysRevA.93.043827 　

    ISSN： 2469-9926

    eISSN： 2469-9934

  57. Floquet topological system based on frequency-modulated classical coupled harmonic oscillators Peer-reviewed

    Grazia Salerno, Tomoki Ozawa, Hannah M. Price, Iacopo Carusotto

    PHYSICAL REVIEW B　93　(8)　2016/02

    DOI： 10.1103/PhysRevB.93.085105 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  58. Momentum-space Landau levels in driven-dissipative cavity arrays Peer-reviewed

    Andrei C. Berceanu, Hannah M. Price, Tomoki Ozawa, Iacopo Carusotto

    PHYSICAL REVIEW A　93　(1)　2016/01

    DOI： 10.1103/PhysRevA.93.013827 　

    ISSN： 1050-2947

    eISSN： 1094-1622

  59. Momentum-space Landau levels in arrays of coupled ring resonators Peer-reviewed

    Hannah M. Price, Andrei C. Berceanu, Tomoki Ozawa, Iacopo Carusotto

    ADVANCES IN PHOTONICS OF QUANTUM COMPUTING, MEMORY, AND COMMUNICATION IX　9762　2016

    DOI： 10.1117/12.2218615 　

    ISSN： 0277-786X

  60. Towards four-dimensional photonics Peer-reviewed

    Hannah M. Price, Tomoki Ozawa, Nathan Goldman, Oded Zilberberg, Iacopo Carusotto

    ADVANCES IN PHOTONICS OF QUANTUM COMPUTING, MEMORY, AND COMMUNICATION IX　9762　2016

    DOI： 10.1117/12.2218539 　

    ISSN： 0277-786X

  61. Four-Dimensional Quantum Hall Effect with Ultracold Atoms Peer-reviewed

    H. M. Price, O. Zilberberg, T. Ozawa, I. Carusotto, N. Goldman

    PHYSICAL REVIEW LETTERS　115　(19)　2015/11

    DOI： 10.1103/PhysRevLett.115.195303 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  62. ULTRACOLD ATOMS Feel the gauge Peer-reviewed

    Tomoki Ozawa

    NATURE PHYSICS　11　(10)　801-802　2015/10

    DOI： 10.1038/nphys3447 　

    ISSN： 1745-2473

    eISSN： 1745-2481

  63. Edge states in polariton honeycomb lattices Peer-reviewed

    M. Milicevic, T. Ozawa, P. Andreakou, I. Carusotto, T. Jacqmin, E. Galopin, A. Lemaitre, L. Le Gratiet, I. Sagnes, J. Bloch, A. Amo

    2D MATERIALS　2　(3)　2015/09

    DOI： 10.1088/2053-1583/2/3/034012 　

    ISSN： 2053-1583

  64. How to directly observe Landau levels in driven-dissipative strained honeycomb lattices Peer-reviewed

    Grazia Salerno, Tomoki Ozawa, Hannah M. Price, Iacopo Carusotto

    2D MATERIALS　2　(3)　2015/09

    DOI： 10.1088/2053-1583/2/3/034015 　

    ISSN： 2053-1583

  65. Momentum-space Harper-Hofstadter model Peer-reviewed

    Tomoki Ozawa, Hannah M. Price, Iacopo Carusotto

    PHYSICAL REVIEW A　92　(2)　2015/08

    DOI： 10.1103/PhysRevA.92.023609 　

    ISSN： 1050-2947

    eISSN： 1094-1622

  66. Artificial magnetic fields in momentum space in spin-orbit-coupled systems Peer-reviewed

    Hannah M. Price, Tomoki Ozawa, Nigel R. Cooper, Iacopo Carusotto

    PHYSICAL REVIEW A　91　(3)　2015/03

    DOI： 10.1103/PhysRevA.91.033606 　

    ISSN： 1050-2947

    eISSN： 1094-1622

  67. Quantum Mechanics with a Momentum-Space Artificial Magnetic Field Peer-reviewed

    Hannah M. Price, Tomoki Ozawa, Iacopo Carusotto

    PHYSICAL REVIEW LETTERS　113　(19)　2014/11

    DOI： 10.1103/PhysRevLett.113.190403 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  68. Chandrasekhar-Clogston limit and critical polarization in a Fermi-Bose superfluid mixture Peer-reviewed

    Tomoki Ozawa, Alessio Recati, Marion Delehaye, Frederic Chevy, Sandro Stringari

    PHYSICAL REVIEW A　90　(4)　2014/10

    DOI： 10.1103/PhysRevA.90.043608 　

    ISSN： 2469-9926

    eISSN： 2469-9934

  69. Anomalous and Quantum Hall Effects in Lossy Photonic Lattices Peer-reviewed

    Tomoki Ozawa, Iacopo Carusotto

    PHYSICAL REVIEW LETTERS　112　(13)　2014/04

    DOI： 10.1103/PhysRevLett.112.133902 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  70. Condensation of bosons with Rashba-Dresselhaus spin-orbit coupling Peer-reviewed

    Gordon Baym, Tomoki Ozawa

    17TH INTERNATIONAL CONFERENCE ON RECENT PROGRESS IN MANY-BODY THEORIES (MBT17)　529　2014

    DOI： 10.1088/1742-6596/529/1/012006 　

    ISSN： 1742-6588

  71. Discontinuities in the First and Second Sound Velocities at the Berezinskii-Kosterlitz-Thouless Transition Peer-reviewed

    Tomoki Ozawa, Sandro Stringari

    PHYSICAL REVIEW LETTERS　112　(2)　2014/01

    DOI： 10.1103/PhysRevLett.112.025302 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  72. Supercurrent and dynamical instability of spin-orbit-coupled ultracold Bose gases Peer-reviewed

    Ozawa, T., Pitaevskii, L.P., Stringari, S.

    Physical Review A - Atomic, Molecular, and Optical Physics　87　(6)　2013/06

    DOI： 10.1103/PhysRevA.87.063610 　

    ISSN： 1050-2947 1094-1622

  73. Condensation transition of ultracold bose gases with rashba spin-orbit coupling Peer-reviewed

    Ozawa, T., Baym, G.

    Physical Review Letters　110　(8)　2013/02

    DOI： 10.1103/PhysRevLett.110.085304 　

    ISSN： 0031-9007 1079-7114

  74. Erratum: Striped states in weakly trapped ultracold Bose gases with Rashba spin-orbit coupling [Phys. Rev. A85, 063623 (2012)]

    Tomoki Ozawa, Gordon Baym

    Physical Review A　86　(1)　2012/07/26

    DOI： 10.1103/physreva.86.019905 　

    ISSN： 1050-2947

    eISSN： 1094-1622

  75. Stability of Ultracold Atomic Bose Condensates with Rashba Spin-Orbit Coupling against Quantum and Thermal Fluctuations Peer-reviewed

    Tomoki Ozawa, Gordon Baym

    PHYSICAL REVIEW LETTERS　109　(2)　2012/07

    DOI： 10.1103/PhysRevLett.109.025301 　

    ISSN： 0031-9007

  76. Striped states in weakly trapped ultracold Bose gases with Rashba spin-orbit coupling Peer-reviewed

    Tomoki Ozawa, Gordon Baym

    PHYSICAL REVIEW A　85　(6)　2012/06

    DOI： 10.1103/PhysRevA.85.063623 　

    ISSN： 1050-2947

  77. Ground-state phases of ultracold bosons with Rashba-Dresselhaus spin-orbit coupling Peer-reviewed

    Tomoki Ozawa, Gordon Baym

    PHYSICAL REVIEW A　85　(1)　2012/01

    DOI： 10.1103/PhysRevA.85.013612 　

    ISSN： 1050-2947

  78. Renormalization of interactions of ultracold atoms in simulated Rashba gauge fields Peer-reviewed

    Tomoki Ozawa, Gordon Baym

    PHYSICAL REVIEW A　84　(4)　2011/10

    DOI： 10.1103/PhysRevA.84.043622 　

    ISSN： 1050-2947

  79. Plastid-to-nucleus retrograde signals are essential for the expression of nuclear starch biosynthesis genes during amyloplast differentiation in tobacco BY-2 cultured cells

    Enami, K., Ozawa, T., Motohashi, N., Nakamura, M., Tanaka, K., Hanaoka, M.

    Plant Physiology　157　(1)　2011

    DOI： 10.1104/pp.111.178897 　

    ISSN： 1532-2548 0032-0889

  80. Population imbalance and pairing in the BCS-BEC crossover of three-component ultracold fermions Peer-reviewed

    Tomoki Ozawa, Gordon Baym

    PHYSICAL REVIEW A　82　(6)　2010/12

    DOI： 10.1103/PhysRevA.82.063615 　

    ISSN： 1050-2947

  81. Two-slit diffraction with highly charged particles: Niels Bohr's consistency argument that the electromagnetic field must be quantized Peer-reviewed

    Gordon Baym, Tomoki Ozawa

    PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA　106　(9)　3035-3040　2009/03

    DOI： 10.1073/pnas.0813239106 　

    ISSN： 0027-8424

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Books and Other Publications 2

  1. Quantum Fluids of Light and Matter, Proceedings of the International School of Physics "Enrico Fermi"

    Alberto Bramati, Iacopo Carusotto, Cristiano Ciuti

    IOS Press　2025

    ISBN: 9781643685748

  2. 研究者、生活を語る : 「両立」の舞台裏

    岩波書店編集部

    岩波書店　2024/10

    ISBN: 9784000616614

Research Projects 7

  1. Geometrical effects in non-Hermitian quantum systems

    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: Tohoku University

    2024/04 - 2028/03

  2. 量子幾何とトポロジーを用いたAMO量子技術の開発

    小澤知己

    Offer Organization: JST

    System: さきがけ

    2023/10 - 2027/03

  3. 自己駆動する集団におけるカイラル輸送現象の研究

    早田 智也, 川口 喬吾, 小澤 知己

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 基盤研究(B)

    Category: 基盤研究(B)

    Institution: 慶應義塾大学

    2021/04 - 2024/03

  4. Study of localization and topology through quantum metric and quantum geometric tensor

    Offer Organization: Japan Society for the Promotion of Science

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

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

    Institution: Institute of Physical and Chemical Research

    2020/04 - 2024/03

  5. Topological physics and its applications in atomic, molecular, and optical physics

    Tomoki Ozawa

    Offer Organization: JST

    System: PRESTO

    2019/10 - 2023/03

  6. Theoretical study of high dimensional physical phenomena in ultracold atomic gases Competitive

    Tomoki Ozawa

    Offer Organization: Japan Society for the Promotion of Science

    System: KAKENHI Research Activity Start-up

    2018/08 - 2020/03

  7. Novel method for realizing artificial magnetic fields in ultracold atomic gases Competitive

    Tomoki Ozawa

    Offer Organization: RIKEN

    System: Incentive Research Projects

    2018 - 2019

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Teaching Experience 6

  1. Quantum simulation and topological physics in synthetic quantum materials　Tokyo Institute of Technology

  2. An Introduction to Topological Phases of Matter　トレント大学

  3. Statistical Physics　イリノイ大学アーバナ・シャンペーン校

  4. Quantum Mechanics I　イリノイ大学アーバナ・シャンペーン校

  5. College Physics: Mechanics & Heat　イリノイ大学アーバナ・シャンペーン校

  6. University Physics: Thermal & Quantum Physics　イリノイ大学アーバナ・シャンペーン校

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