Details of the Researcher

PHOTO

Chen Hsiao Yi
Section
Institute for Materials Research
Job title
Assistant Professor
Degree

  • Ｐｈ．Ｄ．（カリフォルニア工科大学）

e-Rad No.
41012785

Research History 1

  • 2021/08 - 2024/06
    RIKEN　Center for Emergent Matter Science　Special Postdoctoral Researcher

Education 2

  • California Institute of Technology　Department of Physics

    2014/09 - 2021/06

  • National Taiwan University　Department of Physics

    2009/09 - 2013/06

Professional Memberships 2

  • Physical Society of Japan

    2024/07 - Present

  • アメリカ物理学会

    2017/03 - Present

Research Interests 11

  • スピン波

  • 計算物質科学

  • 物性物理学

  • nonlinear optics

  • phonon

  • First principle calculation

  • Hall Effect

  • 半導体光物性

  • 電子フォノン相互作用

  • Exciton

  • Density Functional Theory

Research Areas 1

  • Natural sciences / Mathematical physics and basic theory /

Awards 3

  1. Demetriades-Tsafka-Kokkalis Prize for best PhD thesis in Nanotechnology

    2021/06　California Institute of Thecnology

  2. J. Yang Scholarship

    2020/07　J. Yang & Family Foundation

  3. Ministry of Education Taiwan-Caltech Scholarship

    2014/09　Ministry of Education Taiwan

Papers 19

  1. Topological Hall Effect of Skyrmions from first Principles

    Hsiao-Yi Chen, Takuya Nomoto, Max Hirschberger, Ryotaro Arita

    Physical Review X　15　(1)　2025/03/11

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevx.15.011054 　

    eISSN： 2160-3308

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    We formulate a first-principles approach for calculating the topological Hall effect (THE) in magnets with noncollinear nanoscale spin textures. We employ a modeling method to determine the effective magnetic field induced by the spin texture, thereby circumventing the computational challenges associated with superlattice calculations. Based on these results, we construct a Wannier tight-binding Hamiltonian to characterize the electronic states and calculate the Hall conductivity. Applying this approach to the skyrmion material Gd2PdSi3 shows good agreement with experimental data. Our analysis in momentum space further reveals that the dominant contribution to the THE arises from the crossing points between the folded bands along high-symmetry lines in the Brillouin zone. This work advances numerical techniques for simulating a general magnetic system, exemplified by but not restricted to skyrmion lattice, and its result offering insights into the complex interplay between spin textures and electronic transport. Published by the American Physical Society 2025

  2. Exciton Dynamics Studies from First-Principles Calculations: Radiative Recombination, Exciton-Phonon Interactions, and Ultrafast Exciton Relaxation

    Hsiao-Yi Chen

    2021/06

    DOI： 10.7907/4edg-jw48 　

  3. Exciton-Phonon Interaction and Relaxation Times from First Principles

    Hsiao-Yi Chen, Davide Sangalli, Marco Bernardi

    Physical Review Letters　125　(10)　2020/08/31

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevlett.125.107401 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  4. Strain-tuning for superconductivity in La3Ni2O7 thin films

    Motoki Osada, Chieko Terakura, Akiko Kikkawa, Masamichi Nakajima, Hsiao-Yi Chen, Yusuke Nomura, Yoshinori Tokura, Atsushi Tsukazaki

    Communications Physics　2025/06/12

    DOI： 10.1038/s42005-025-02154-6 　

  5. DiracBilinears.jl: A package for computing Dirac bilinears in solids

    DiracBilinears.jl, A package for, computing Dirac bilinears in solids

    arXiv　2025/03

    DOI： 10.48550/arXiv.2503.11039 　

  6. Magnon-phonon interactions from first principles

    Khoa B. Le, Ali Esquembre-Kucukalic, Hsiao-Yi Chen, Ivan Maliyov, Jin-Jian Zhou, Davide Sangalli, Alejandro Molina-Sanchez, Marco Bernardi

    arXiv　2025/02

    DOI： 10.48550/arXiv.2502.05385 　

  7. Giant Hall effect in a highly conductive frustrated magnet GdCu2

    Kosuke Karube, Yoshichika Ōnuki, Taro Nakajima, Hsiao-Yi Chen, Hiroaki Ishizuka, Motoi Kimata, Takashi Ohhara, Koji Munakata, Takuya Nomoto, Ryotaro Arita, Taka-hisa Arima, Yoshinori Tokura, Yasujiro Taguchi

    arXiv　2024/12

    DOI： 10.48550/arXiv.2409.17478 　

  8. Development of an ab initio method for exciton condensation and its application to TiSe2

    Hsiao-Yi Chen, Takuya Nomoto, Ryotaro Arita

    Physical Review Research　5　(4)　2023/11/27

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevresearch.5.043183 　

    eISSN： 2643-1564

  9. Bulk Photovoltaic Effect Along the Nonpolar Axis in Organic‐Inorganic Hybrid Perovskites

    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.

  10. First-principles ultrafast exciton dynamics and time-domain spectroscopies: Dark-exciton mediated valley depolarization in monolayer WSe2

    Hsiao-Yi Chen, Davide Sangalli, Marco Bernardi

    Physical Review Research　4　(4)　2022/12/21

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevresearch.4.043203 　

    eISSN： 2643-1564

  11. Dark matter direct detection in materials with spin-orbit coupling

    Hsiao-Yi Chen, Andrea Mitridate, Tanner Trickle, Zhengkang Zhang, Marco Bernardi, Kathryn M. Zurek

    Physical Review D　106　(1)　2022/07/25

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevd.106.015024 　

    ISSN： 2470-0010

    eISSN： 2470-0029

  12. Facile ab initio approach for self-localized polarons from canonical transformations

    Nien-En Lee, Hsiao-Yi Chen, Jin-Jian Zhou, Marco Bernardi

    Physical Review Materials　5　(6)　2021/06/24

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevmaterials.5.063805 　

    eISSN： 2475-9953

  13. Radiative properties of quantum emitters in boron nitride from excited state calculations and Bayesian analysis

    Shiyuan Gao, Hsiao-Yi Chen, Marco Bernardi

    npj Computational Materials　7　(1)　2021/06/04

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41524-021-00544-2 　

    eISSN： 2057-3960

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    Abstract Point defects in hexagonal boron nitride (hBN) have attracted growing attention as bright single-photon emitters. However, understanding of their atomic structure and radiative properties remains incomplete. Here we study the excited states and radiative lifetimes of over 20 native defects and carbon or oxygen impurities in hBN using ab initio density functional theory and GW plus Bethe-Salpeter equation calculations, generating a large data set of their emission energy, polarization and lifetime. We find a wide variability across quantum emitters, with exciton energies ranging from 0.3 to 4 eV and radiative lifetimes from ns to ms for different defect structures. Through a Bayesian statistical analysis, we identify various high-likelihood charge-neutral defect emitters, among which the native VNNB defect is predicted to possess emission energy and radiative lifetime in agreement with experiments. Our work advances the microscopic understanding of hBN single-photon emitters and introduces a computational framework to characterize and identify quantum emitters in 2D materials.

  14. Ab initio electron-two-phonon scattering in GaAs from next-to-leading order perturbation theory

    Nien-En Lee, Jin-Jian Zhou, Hsiao-Yi Chen, Marco Bernardi

    Nature Communications　11　(1)　2020/03/30

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41467-020-15339-0 　

    eISSN： 2041-1723

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    Abstract Electron-phonon (e–ph) interactions are usually treated in the lowest order of perturbation theory. Here we derive next-to-leading order e–ph interactions, and compute from first principles the associated electron-two-phonon (2ph) scattering rates. The derivations involve Matsubara sums of two-loop Feynman diagrams, and the numerical calculations are challenging as they involve Brillouin zone integrals over two crystal momenta and depend critically on the intermediate state lifetimes. Using Monte Carlo integration together with a self-consistent update of the intermediate state lifetimes, we compute and converge the 2ph scattering rates, and analyze their energy and temperature dependence. We apply our method to GaAs, a weakly polar semiconductor with dominant optical-mode long-range e–ph interactions. We find that the 2ph scattering rates are as large as nearly half the value of the one-phonon rates, and that including the 2ph processes is necessary to accurately predict the electron mobility in GaAs from first principles.

  15. Precise radiative lifetimes in bulk crystals from first principles: the case of wurtzite gallium nitride

    Vatsal A Jhalani, Hsiao-Yi Chen, Maurizia Palummo, Marco Bernardi

    Journal of Physics: Condensed Matter　32　(8)　084001-084001　2019/11/22

    Publisher: IOP Publishing

    DOI： 10.1088/1361-648x/ab5563 　

    ISSN： 0953-8984

    eISSN： 1361-648X

  16. Ab initio calculations of exciton radiative lifetimes in bulk crystals, nanostructures, and molecules

    Hsiao-Yi Chen, Vatsal A. Jhalani, Maurizia Palummo, Marco Bernardi

    Physical Review B　100　(7)　2019/08/16

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevb.100.075135 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  17. Theory and Ab Initio Computation of the Anisotropic Light Emission in Monolayer Transition Metal Dichalcogenides

    Hsiao-Yi Chen, Maurizia Palummo, Davide Sangalli, Marco Bernardi

    Nano Letters　18　(6)　3839-3843　2018/05/08

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acs.nanolett.8b01114 　

    ISSN： 1530-6984

    eISSN： 1530-6992

  18. Connecting mirror symmetry in 3D and 2D via localization

    Heng-Yu Chen, Hsiao-Yi Chen, Jun-Kai Ho

    International Journal of Modern Physics A　29　(32)　1530004-1530004　2014/12/30

    Publisher: World Scientific Pub Co Pte Lt

    DOI： 10.1142/s0217751x15300045 　

    ISSN： 0217-751X

    eISSN： 1793-656X

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    We explicitly apply localization results to study the interpolation between three- and two-dimensional mirror symmetries for Abelian gauge theories with four supercharges. We first use the ellipsoid [Formula: see text] partition functions to verify the mirror symmetry between a pair of general three-dimensional 𝒩 = 2 Abelian Chern–Simons quiver gauge theories. These expressions readily factorize into holomorphic blocks and their antiholomorphic copies, so we can also obtain the partition functions on S1×S2 via fusion procedure. We then demonstrate S1×S2 partition functions for the three-dimensional Abelian gauge theories can be dimensionally reduced to the S2 partition functions of 𝒩 = (2, 2) GLSM and Landau–Ginzburg model for the corresponding two-dimensional mirror pair, as anticipated previously in M. Aganagic et al., J. High Energy Phys.0107, 022 (2001). We also comment on the analogous interpolation for the non-Abelian gauge theories and compute the K-theory vortex partition function for a simple limit to verify the prediction from holomorphic block.

  19. Heterotic surface defects and dualities from 2d/4d indices

    Heng-Yu Chen, Hsiao-Yi Chen

    Journal of High Energy Physics　2014　(10)　2014/10/01

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/jhep10(2014)004 　

    eISSN： 1029-8479

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Presentations 18

  1. Ab initio approach for exciton-phonon interactions and exciton dynamics Invited

    Marco Bernardi, Davide Sangalli, Hsiao-Yi Chen

    APS March Meeting　2024/03

  2. First-principles study of spin-wave in non-collinear chiral magnet

    Hsiao-Yi Chen, Ryotaro Arita, Yusuke Nomura

    APS March Meeting　2025/03

  3. Development of an Ab Initio Method for Non-coplanar Chiral Magnets and Response Properties

    Hsiao-Yi Chen, Takuya Nomoto, Max Hirschberger, Ryotaro Arita

    Workshop on theory of cross correlations, multipoles, and computational material design　2025/02

  4. Development of an Ab Initio Method for Non-coplanar Chiral Magnets and Response Properties

    Hsiao-Yi Chen, Takuya Nomoto, Max Hirschberger, Ryotaro Arita

    Summit of Materials Science 2024 and GIMRT User Meeting 2024　2024/11

  5. Development of an Ab Initio Method for Non-coplanar Chiral Magnets and Response Properties

    Hsiao-Yi Chen, Takuya Nomoto, Max Hirschberger, Ryotaro Arita

    The 8th Symposium for the Core Research Clusters for Materials Science and Spintronics and the 7th Symposium on International Joint Graduate Programs in Materials Science and Spintronics　2024/11

  6. 磁気スキルミオン格子における トポロジカルホール効果の第一原理計算

    Hsiao-Yi Chen, 野本 拓也, Max Hirschberger, 有田 亮太郎

    日本物理学会 第79回年次大会　2024/09

  7. First-Principles Study of the Topological Hall Effect Induced by Spin Textures

    Hsiao-Yi Chen, Takuya Nomoto, Max Hirschberger, Ryotaro Arita

    APS March Meeting　2024/03

  8. First Principles Calculation of Topological Hall Conductance in the Skyrmion lattice

    Hsiao-Yi Chen, Takuya Nomoto, Max Hirschberger, Ryotaro Arita

    RIKEN Symposium: Second Workshop on Fundamentals in Density Functional Theory　2024/02

  9. First Principles Calculation of Topological Hall Conductance in the Skyrmion lattice

    Hsiao-Yi Chen, Takuya Nomoto, Max Hirschberger, Ryotaro Arita

    The Symposium on Quantum Electronics　2023/12

  10. Density Functional Theory for excitonic insulator

    Hsiao-Yi Chen, Takuya Nomoto, Ryotaro Arita

    Hierarchical Structure and Machine Learning (HISML) 2023　2023/11

  11. Development of ab initio method for exciton condensation and its application to TiSe2

    Hsiao-Yi Chen, Takuya Nomoto, Ryotaro Arita

    APS March Meeting　2023/03

  12. Development of ab initio method for exciton condensation and its application to TiSe2

    Hsiao-Yi Chen, Takuya Nomoto, Ryotaro Arita

    Integrated Spectroscopy for Strong Electron Correlation - Theory, Computation and Experiment (ISSEC2022)　2022/12

  13. Exciton dynamics and transient behavior from first-principle Invited

    Hsiao-Yi Chen

    The 20th Workshop on First-Principles Computational Materials Physics　2022/11

  14. Exciton Dynamics in Monolayer WSe2

    Hsiao-Yi Chen, Davide Sangalli, Marco Bernardi

    APS March Meeting　2021/03

  15. Ab Initio Approach for Exciton Dynamics

    Hsiao-Yi Chen, Marco Bernardi

    APS March Meeting　2020/03

  16. Ab Initio Approach for Exciton Dynamics and Radiative Properties

    Hsiao-Yi Chen, Marco Bernardi

    ETSF Workshop on Electronic Excitations　2019/09

  17. Ab Initio Approach for Exciton-Phonon Interactions

    Hsiao-Yi Chen, Davide Sangalli, Andrea Marini, Marco Bernardi

    APS March Meeting　2019/03

  18. Ab Initio Radiative Lifetimes and Angular Dependence of the Photoluminescence in Two-Dimensional Transition Metal Dichalcogenides

    Hsiao-Yi Chen, Maurizia Palummo, Davide Sangalli, Marco Bernardi

    APS March Meeting　2018/03

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Media Coverage 1

  1. 複雑なナノスピン構造に由来する物性を予測する 第一原理計算手法を開発 ―次世代高速・低消費エネルギーのスピントロニクス素子開発に貢献― Myself

    東北大学金属材料研究所 情報企画室広報班　https://www.imr.tohoku.ac.jp/ja/news/results/detail---id-1721.html

    2025/03/13

    Type: Promotional material