Details of the Researcher

PHOTO

Tatsuya Miki
Section
Institute for Materials Research
Job title
e-Rad No.
21033771

Research History 3

  • 2026/04 - Present
    Tohoku University　Institute for Materials Research　Research Fellowship for Young Scientists PD

  • 2025/10 - 2026/03
    Tohoku University　Institute for Materials Research　Specially Appointed Researcher

  • 2023/04 - 2025/09
    Saitama University　Graduate School of Science and Engineering　Research Fellowship for Young Scientists DC1

Education 3

  • Saitama University　Graduate School of Science and Engineering　Science and Engineering Material Science

    2023/04 - 2025/09

  • Saitama University　Graduate School of Science and Engineering　Physics and Functional Materials Science Physics Course

    2021/04 - 2023/03

  • Saitama University　Faculty of Science　Department of Physics

    2017/04 - 2021/03

Research Interests 3

  • first-principles calculation

  • Chirality

  • Superconductivity

Research Areas 1

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

Papers 12

  1. Electron chirality and hydrodynamic helicity: Analysis in the atomic limit Peer-reviewed

    Tatsuya Miki, Yuta Kakinuma, Masato Senami, Masahiro Fukuda, Michi-To Suzuki, Hiroaki Ikeda, Shintaro Hoshino

    Physical Review B　113　235127　2026/06/15

    DOI： 10.1103/ghyy-mynx 　

  2. Dirac bilinears in condensed matter physics: Relativistic correction for observables and conjugate electromagnetic fields Peer-reviewed

    Shintaro Hoshino, Tatsuya Miki, Michi-To Suzuki, Hiroaki Ikeda

    Physical Review B　113　115113　2026/03/09

    DOI： 10.1103/1zfs-f3s8 　

  3. Symmetry-breaking perturbations in the Jahn-Teller-Hubbard model Peer-reviewed

    Natsuki Okada, Tatsuya Miki, Yusuke Nomura, Philipp Werner, Shintaro Hoshino

    Physical Review B　113　(2)　024517　2026/01/27

    Publisher: American Physical Society (APS)

    DOI： 10.1103/nwnn-4rx5 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  4. Weak coupling approach to magnetic and orbital susceptibilities for superconducting states in multiorbital electron-phonon coupled model Peer-reviewed

    Natsuki Okada, Tatsuya Miki, Shintaro Hoshino

    Journal of Physics: Conference Series　3161　(1)　012016-012016　2026/01/01

    Publisher: IOP Publishing

    DOI： 10.1088/1742-6596/3161/1/012016 　

    ISSN： 1742-6588

    eISSN： 1742-6596

    More details Close

    Abstract Alkali-doped fullerides are molecular-based superconductors with multiple active orbitals. In this paper, using the Eliashberg theory with the retardation effect of Jahn-Teller phonons, we study the response of the spin-singlet superconducting state relevant to fulleride materials. The spin Zeeman field is not active for the singlet pairing state, and the magnetic orbital field, which physically generates a circular electron motion inside the fullerene molecule, is also shown to be inactive. On the other hand, the electric orbital (or quadrupolar) field, which corresponds to a uniaxial distortion, remains active across the superconducting phase transition. This is understood by the orbital-symmetric structure of the Cooper pair, which is susceptible to the electric orbital field, while it is not the case for the magnetic orbital field, which tends to create an antisymmetric part.

  5. Properties of electronic axiality in bulk crystals Peer-reviewed

    Tatsuya Miki, Hiroaki Ikeda, Michi-To Suzuki, Shintaro Hoshino

    Journal of Physics: Conference Series　3161　(1)　012015-012015　2026/01/01

    Publisher: IOP Publishing

    DOI： 10.1088/1742-6596/3161/1/012015 　

    ISSN： 1742-6588

    eISSN： 1742-6596

    More details Close

    Abstract Axial materials, with an axial vector as their order parameter, represent a novel class of ferroic materials with the potential for unique functionalities due to their intrinsic asymmetry. We recently proposed the order parameter in axial materials, namely axiality, based on relativistic quantum theory. The axiality is defined by the spatial integral of the axial vector over the unit cell, which depends on the choice of the unit cell and its origin. In this study, we examine these dependencies on axiality for the axial crystal K 2 Zr(PO 4 ) 2 . We investigate two unit cell choices: the Wigner–Seitz cell and the simple unit cell spanned by the primitive lattice vectors a 1 , a 2 , a 3 . We find that in the simple unit cell, the x - and y -components of axiality are finite and comparable in magnitude to the z -component. In contrast, in the Wigner–Seitz cell, the x - and y -componentsof axiality become zero due to the three-fold rotational symmetry. While the x - and y -components of axiality exhibit distinct behaviors in these cells, we demonstrate that the z -component of axiality remains identical in both cells.

  6. DiracBilinears.jl: A package for computing Dirac bilinears in solids Peer-reviewed

    Tatsuya Miki, Hsiao-Yi Chen, Takashi Koretsune, Yusuke Nomura

    Computer Physics Communications　317　109857-109857　2025/12

    Publisher: Elsevier BV

    DOI： 10.1016/j.cpc.2025.109857 　

    ISSN： 0010-4655

  7. Quantification of Electronic Asymmetry: Chirality and Axiality in Solids Peer-reviewed

    Tatsuya Miki, Hiroaki Ikeda, Michi-To Suzuki, Shintaro Hoshino

    Physical Review Letters　134　(22)　226401　2025/06/04

    Publisher: American Physical Society (APS)

    DOI： 10.1103/PhysRevLett.134.226401 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  8. Odd-frequency pairing of Bogoliubov quasiparticles in superconductor junctions Peer-reviewed

    Tatsuya Miki, Yukio Tanaka, Shun Tamura, Shintaro Hoshino

    Physical Review B　110　(5)　054517　2024/08/20

    Publisher: American Physical Society (APS)

    DOI： 10.1103/PhysRevB.110.054517 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  9. Impurity effect on Bogoliubov Fermi surfaces: Analysis based on iron-based superconductors Peer-reviewed

    Tatsuya Miki, Hiroaki Ikeda, Shintaro Hoshino

    Physical Review B　109　(9)　094502　2024/03/04

    Publisher: American Physical Society (APS)

    DOI： 10.1103/PhysRevB.109.094502 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  10. Effect of Normal Self-energy on the Free Energy Functional for the Odd-frequency Pairing near Transition Temperature Peer-reviewed

    Tatsuya Miki, Shintaro Hoshino

    Proceedings of the 29th International Conference on Low Temperature Physics (LT29)　38　011060　2023/05/22

    Publisher: Journal of the Physical Society of Japan

    DOI： 10.7566/jpscp.38.011060 　

  11. Impurity effects on Bogoliubov Fermi surfaces: A comparison with conventional BCS pairing Peer-reviewed

    Shintaro Hoshino, Tatsuya Miki

    Journal of Physics: Conference Series　2323　(1)　012002-012002　2022/08/01

    Publisher: IOP Publishing

    DOI： 10.1088/1742-6596/2323/1/012002 　

    ISSN： 1742-6588

    eISSN： 1742-6596

    More details Close

    Abstract The superconductors can have a Fermi surface even below the transition temperature, which is known as the Bogoliubov Fermi surface. Focusing on the degrees of freedom at low energies, which are described by the spinless Bogoliubov particles for the case without time-reversal symmetry, we consider the self-energy from the impurity scattering on the Bogoliubov Fermi surfaces. The physical quantities such as the density of states are evaluated based on the single-particle Green’s functions. We systematically compare these results with those of the conventional s-wave spin-singlet pairing state, to illuminate the characteristic features of the Bogoliubov particles located at the Fermi level.

  12. Odd-frequency pairing inherent in a Bogoliubov Fermi liquid Peer-reviewed

    Tatsuya Miki, Shun-Ta Tamura, Shoma Iimura, Shintaro Hoshino

    Physical Review B　104　(9)　094518　2021/09/21

    Publisher: American Physical Society (APS)

    DOI： 10.1103/PhysRevB.104.094518 　

    ISSN： 2469-9950

    eISSN： 2469-9969

Show all ︎Show first 5

Research Projects 2

  1. 電子カイラリティで拓く界面物理学

    三木 健矢

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 特別研究員奨励費

    Institution: 東北大学

    2026/04/01 - 2029/03/31

  2. ボゴリウボフ・フェルミ面に対するフェルミ液体論の性質の解明

    三木 健矢

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 特別研究員奨励費

    Institution: 埼玉大学

    2023/04 - 2026/03

    More details Close

    通常の超伝導体はフェルミ準位にエネルギーギャップを有するが、近年、超伝導状態にもかかわらずフェルミ面を有する新たなタイプの超伝導体（ボゴリウボフ・フェルミ面）が提案されている。この超伝導状態のフェルミ面を構成する準粒子（ボゴロン）は、通常の金属におけるフェルミ面を構成する電子とは異なる性質を持つと考えられる。 本研究の目的は、ボゴロンに特有な物理的効果に注目し、その性質を反映したボゴリウボフ・フェルミ面における新たな物性を解明することである。これまでに、相互作用や不純物によって、物質内部（バルク）において純粋な奇周波数ペアが空間反転対称性に起因して誘起されるという、ボゴロン特有の物理現象を明らかにしてきた。 本年度は、接合界面に現れる特殊なボゴロン状態を解析し、界面における空間反転対称性の破れに由来する特有の性質を明らかにした。具体的には、通常の超伝導体の解析にも用いられるマクミラン・グリーン関数法を用いてボゴロンのグリーン関数を計算した。その結果、ボゴロンのペアポテンシャルにおける位相差が増加するにつれて、界面におけるゼロエネルギー局所状態密度が減少することを見出した。この局所状態密度の減少は、空間反転対称性の破れにより偶周波数ペア振幅が増大することと対応しており、通常のs波超伝導体とは対照的な振る舞いである。 さらに、バルクに存在する奇周波数ペアにより、π接合に類似した準粒子流と位相の関係が実現されることを示した。加えて、計算されたマクミラン・グリーン関数から空間的に緩やかな振動成分を抽出することにより準古典グリーン関数を求め、ボゴロンのペアの空間的変化を支配する典型的な長さスケールを明らかにした。