お問い合わせ

研究室での区分 · 旧スタッフ

奥川 亮 Ryo Okugawa

物性理論を専門とし、電子状態の幾何と対称性に関わるトポロジカル物性を研究しています。

所属

  • 東京理科大学 先進工学部 物理工学科 嘱託特別講師

研究・活動の広がり

掲載した成果には、物性・材料の理論、量子ダイナミクスに関する研究が含まれます。

研究成果とあわせて、講演・発表の記録も紹介しています。

論文

大関研究室での活動による業績

No. Title Author Bibliography DOI
82 Mirror-symmetry-protected dynamical quantum phase transitions in topological crystalline insulators Ryo Okugawa, Hiroki Oshiyama, Masayuki Ohzeki Physical Review Research 3 (4) 043064 (2021) 10.1103/PhysRevResearch.3.043064

講演・発表

Title Conference / Event 区分 Date
鏡映対称性に守られた動的量子相転移およびその高次トポロジカル相における例 日本物理学会2021秋季大会 国内 2021年9月23日 口頭講演
研究業績に戻る

主な研究成果

論文・会議録から主な成果を紹介します。掲載年：2014〜2026年。

研究室での活動に限定せず、これまでの主な成果を紹介します。

  1. 雑誌論文

    Topological Dirac nodal lines and surface charges in fcc alkaline earth metals

    Motoaki Hirayama, Ryo Okugawa, Takashi Miyake, Shuichi Murakami

    Nature Communications 8 (1) 14022 2017-01-11

  2. 雑誌論文

    Exceptional second-order topological insulators

    Yutaro Tanaka, Daichi Nakamura, Ryo Okugawa, Kohei Kawabata

    Physical Review B 112 (24) 245302 2025-12-03

  3. 雑誌論文

    Chern insulators and topological flat bands in cavity-embedded kagome systems

    Hikaru Goto, Ryo Okugawa, Takami Tohyama

    Physical Review B 113 (16) 165201 2026-04-01

  4. 雑誌論文

    Quasiperiodicity-induced bulk localization with self-similarity in non-Hermitian systems

    Yu-Peng Wang, Chuo-Kai Chang, Ryo Okugawa, Chen-Hsuan Hsu

    Physical Review Research 7 (4) 043353 2025-12-31

  5. 雑誌論文

    Gapless superconductivity and its real-space topology in quasicrystals

    Kazuma Saito, Masahiro Hori, Ryo Okugawa, K. Tanaka, Takami Tohyama

    Physical Review Research 7 (2) L022077 2025-06-25

  6. 雑誌論文

    Second-order topological phases protected by chiral symmetry

    Ryo Okugawa, Shin Hayashi, Takeshi Nakanishi

    Physical Review B 100 (23) 235302 2019-12-04

  7. 雑誌論文

    Second-order topological non-Hermitian skin effects

    Ryo Okugawa, Ryo Takahashi, Kazuki Yokomizo

    Physical Review B 102 (24) 241202 2020-12-16

  8. 雑誌論文

    Non-Hermitian band topology with generalized inversion symmetry

    Ryo Okugawa, Ryo Takahashi, Kazuki Yokomizo

    Physical Review B 103 (20) 205205 2021-05-21

  9. 雑誌論文

    Discriminant indicators with generalized inversion symmetry

    Tsuneya Yoshida, Ryo Okugawa, Yasuhiro Hatsugai

    Physical Review B 105 (8) 085109 2022-02-07

  10. 雑誌論文

    Rotoinversion-symmetric bulk-hinge correspondence and its applications to higher-order Weyl semimetals

    Yutaro Tanaka, Ryo Takahashi, Ryo Okugawa, Shuichi Murakami

    Physical Review B 105 (11) 115119 2022-03-14

  11. 雑誌論文

    Non-Hermitian skin effect enforced by nonsymmorphic symmetries

    Yutaro Tanaka, Ryo Takahashi, Ryo Okugawa

    Physical Review B 109 (3) 035131 2024-01-16

  12. 雑誌論文

    Dispersion of Fermi arcs in Weyl semimetals and their evolutions to Dirac cones

    Ryo Okugawa, Shuichi Murakami

    Physical Review B 89 (23) 235315 2014-06-20

  13. 雑誌論文

    Universal phase transition and band structures for spinless nodal-line and Weyl semimetals

    Ryo Okugawa, Shuichi Murakami

    Physical Review B 96 (11) 115201 2017-09-01

  14. 雑誌論文

    Generic phase diagram for Weyl superconductivity in mirror-symmetric superconductors

    Ryo Okugawa, Takehito Yokoyama

    Physical Review B 97 (6) 060504 2018-02-15

  15. 雑誌論文

    Topological exceptional surfaces in non-Hermitian systems with parity-time and parity-particle-hole symmetries

    Ryo Okugawa, Takehito Yokoyama

    Physical Review B 99 (4) 041202 2019-01-24

  16. 雑誌論文

    Weyl Node and Spin Texture in Trigonal Tellurium and Selenium

    Motoaki Hirayama, Ryo Okugawa, Shoji Ishibashi, Shuichi Murakami, Takashi Miyake

    Physical Review Letters 114 (20) 206401 2015-05-22

  17. 雑誌論文

    In-Plane Electric Polarization of Bilayer Graphene Nanoribbons Induced by an Interlayer Bias Voltage

    Ryo Okugawa, Junya Tanaka, Takashi Koretsune, Susumu Saito, Shuichi Murakami

    Physical Review Letters 115 (15) 156601 2015-10-05

  18. 雑誌論文

    Weyl superconductivity and quasiperiodic Majorana arcs in quasicrystals

    Masahiro Hori, Ryo Okugawa, K. Tanaka, Takami Tohyama

    Physical Review Research 6 (3) 033088 2024-07-19

  19. 雑誌論文

    Emergence of topological semimetals in gap closing in semiconductors without inversion symmetry

    Shuichi Murakami, Motoaki Hirayama, Ryo Okugawa, Takashi Miyake

    Science Advances 3 (5) e1602680 2017-05-05

  20. 会議録論文

    Dirac Point in Trigonal Tellurium and Selenium

    Motoaki Hirayama, Ryo Okugawa, Shoji Ishibashi, Shuichi Murakami, Takashi Miyake

    Proceedings of Computational Science Workshop 2014 (CSW2014) 2015-02-25

  21. 雑誌論文

    Topological Semimetals Studied by Ab Initio Calculations

    Motoaki Hirayama, Ryo Okugawa, Shuichi Murakami

    Journal of the Physical Society of Japan 87 (4) 041002 2018-04-15

プレプリント

  1. Quasiperiodicity-induced non-Hermitian skin effect from the breakdown of scale-free localization

    Kazuma Saito, Ryo Okugawa, Kazuki Yokomizo, Takami Tohyama, Chen-Hsuan Hsu

    arXiv:2602.11155 ·

  2. Quantum-geometric origin of superfluid weight in quasicrystals with critical states

    Kazuma Saito, Ryo Okugawa, Yusuke Kato, Takami Tohyama

    arXiv:2606.09989 ·

  3. Floquet-Weyl states at one-photon resonances in three-dimensional topological insulators

    Keiya Uehara, Ryo Okugawa, Takami Tohyama, Shun Okumura

    arXiv:2607.07199 · 2026-07-08

  4. Topological Superconducting Phases in a Strained Altermagnet-Superconductor Heterostructure

    Keita Yoshizawa, Ryo Okugawa, Takami Tohyama

    arXiv:2609.30791 · 2026-09-25