大熊 信之
Apr. 2023- Associate professor, Graduate School of Engineering, Kyushu Institute of Technology.
2023年4月より九州工業大学准教授 (大学院工学研究院・基礎科学研究系)
OKUMA, Nobuyuki
大熊 信之
Email address ( _at_ → @ ):
okuma_at_mns.kyutech.ac.jp (九州工業大学)←現所属
okuma_at_hosi.phys.s.u-tokyo.ac.jp (東京大学)←出身研究室, 半永久的に使える(?)
nobuyuki.okuma_at_yukawa.kyoto-u.ac.jp (京都大学)←失効(?)
Research interests:
Non-Hermitian Hamiltonian, magnon transport, topological materials, spintronics
日本物理学会若手奨励賞 (領域4)を受賞しました!
※非エルミートトポロジカル現象に関する招待レビュー論文 (掲載決定済)をarXivに投稿しました !
2023年4月にAnnual Review of Condensed Matter Physicsに掲載される予定です。
※最近研究している非エルミート表皮効果の数理について、日本語pdfを作成しました!
Papers:
20. Nobuyuki Okuma,
"Bosonic Andreev bound state"
19. Daichi Nakamura, Kazuya Inaka, Nobuyuki Okuma, Masatoshi Sato
"Universal platform of point-gap topological phases from topological materials"
to appear in Physical Review Letters
arXiv: 2304.08110
18. Yusuke O. Nakai, Nobuyuki Okuma, Daichi Nakamura, Kenji Shimomura, Masatoshi Sato
"Topological enhancement of non-normality in non-Hermitian skin effects"
17. Nobuyuki Okuma and Tomonari Mizoguchi,
"Relationship between two-particle topology and fractional Chern insulator"
Phys. Rev. Research 5, 013112 (2023).
16. Nobuyuki Okuma,
"Boundary-dependent dynamical instability of bosonic Green's function:
Dissipative Bogoliubov--de Gennes Hamiltonian and its application to non-Hermitian skin effect"
Phys. Rev. B 105, 224301 (2022)
15. (Review article)
Nobuyuki Okuma and Masatoshi Sato,
"Non-Hermitian topological phenomena: A review"
Annual Review of Condensed Matter Physics 14, 83 (2023).
14. Nobuyuki Okuma and Yuya Nakagawa,
"Non-normal Hamiltonian dynamics in quantum systems and its realization on quantum computers"
Phys. Rev. B 105, 054304, (2022).
13. Nobuyuki Okuma and Masatoshi Sato,
"Quantum anomaly, non-Hermitian skin effects, and entanglement entropy in open systems"
Phys. Rev. B 103, 085428 (2021).
12. Nobuyuki Okuma and Masatoshi Sato,
"Non-Hermitian Skin Effects in Hermitian Correlated/Disordered Systems: Boundary-Sensitive/Insensitive Quantities and Pseudo Quantum Number "
Phys. Rev. Lett. 126, 176601(2021)
11. Nobuyuki Okuma and Masatoshi Sato,
"Nonnormality-protected Hermitian zero modes: application of pseudospectra"
Phys. Rev. B 102, 014203 (2020).
10. Kohei Kawabata, Nobuyuki Okuma, Masatoshi Sato,
"Non-Bloch band theory of non-Hermitian Hamiltonians in the symplectic class"
Phys. Rev. B 101, 195147 (2020).
9. Nobuyuki Okuma, Kohei Kawabata, Ken Shiozaki, and Masatoshi Sato
"Topological Origin of Non-Hermitian Skin Effects"
Phys. Rev. Lett. 124, 086801 (2020).
8. Nobuyuki Okuma and Masatoshi Sato
"Topological Phase Transition driven by Infinitesimal Instability: Majorana Fermions in Non-Hermitian Spintronics "
Phys. Rev. Lett. 123, 097701 (2019).
7. Nobuyuki Okuma, Masatoshi Sato, and Ken Shiozaki
"Topological classification under nonmagnetic and magnetic point group symmetry: Application of real-space Atiyah-Hirzebruch spectral sequence to higher-order topology"
Phys. Rev. B 99, 085127 (2019).
6. Nobuyuki Okuma
"Nonreciprocal superposition state in antiferromagnetic optospintronics"
Phys. Rev. B 99, 094401 (2019).
5. Nobuyuki Okuma
"Magnon Spin-Momentum Locking: Various Spin Vortices and Dirac magnons in Noncollinear Antiferromagnets"
Phys. Rev. Lett. 119, 107205 (2017).
4. Nobuyuki Okuma, Massoud Ramezani Masir, and Allan H. MacDonald
“Theory of the spin-Seebeck effect at a topological-insulator/ferromagnetic-insulator interface”
Phys. Rev. B 95, 165418 (2017).
3. Nobuyuki Okuma and Kentaro Nomura
"Microscopic derivation of magnon spin current in topological insulator/ferromagnet heterostructure"
Phys. Rev. B 95, 115403 (2017).
2. Nobuyuki Okuma and Masao Ogata,
"Unconventional Spin Hall Effect and Axial Current Generation in a Dirac Semimetal"
Phys. Rev. B 93, 140205(R) (2016).
1. Nobuyuki Okuma and Masao Ogata,
"Long-range Coulomb interaction effects on the surface Dirac electron system of a three-dimensional topological insulator"
J. Phys. Soc. Jpn. 84, 034710 (2015).
Proceedings:
1. Nobuyuki Okuma and Masao Ogata,
"Study of spin transport in Dirac systems"
J. Phys. Conf. Ser. 603, 012018 (2015).