Theoretical perspectives on novel quantum phases generated by excitonic condensation
| Project/Area Number |
17K05530
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Chiba University |
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Principal Investigator |
Ohta Yukinori 千葉大学, 大学院理学研究院, 教授 (70168954)
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| Project Period (FY) |
2017-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | 励起子絶縁体 / 励起子凝縮 / 強相関電子系 / 物性理論 / 遷移金属カルコゲナイド / コバルト酸化物 / スピン流 / 遷移金属化合物 / 遷移金属酸化物 / 変分クラスター近似 |
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| Outline of Final Research Achievements |
Research on excitonic condensation in correlated electron systems is entering an era of explosive development. In the present study, we aim to deepen the theory of pair condensation mechanism of fermionic systems, which is in analogy with the theory of superconductivity. Comprehensively working on the study of three items of spin-singlet excitonic systems, spin-triplet excitonic systems, and spin-orbit coupled systems, we obtained some important research results such as elucidating the anomalous normal state in Ta2NiSe5 in the spin-singlet excitonic system, magnetic multipole order, spin current, and k-space spin texture in the spin-triplet exciter system. We believe that such results have a great spillover effect that transcends the boundaries of fields in the study of quantum condensation in, e.g., heavy fermion materials, semiconductor double layer systems, and ultracold atomic systems.
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| Academic Significance and Societal Importance of the Research Achievements |
相関電子系における励起子凝縮（電子と正孔の対凝縮）の問題は、超伝導（電子と電子の対凝縮）と並ぶ、フェルミオン系における対凝縮機構の解明という、基礎科学としての物理学分野において大きな学術的意義を有する問題である。超伝導が応用可能性の観点から大き社会的意義を持つことを鑑みれば、そのカウンターパートとしての励起子凝縮研究も幾ばくかの社会的意義を持ち得よう。特に本研究は、現実に存在する物質に関して励起子凝縮の可能性を解明するものであり、従ってそこで得られた研究成果は、大きな学術的意義および社会的意義を持つと期待される。
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Report
(6 results)
Research Products
(105 results)
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[Journal Article] Observation of a Novel Phase Transition in Sr7Re4O192020
Author(s)
Yutaka Ueda, Mina Murase, Yoshiaki Kobayashi, Masayuki Itoh, Takeshi Yajima, Tomoki Yamaguchi, Ryo Takahashi, Koudai Sugimoto, Yukinori Ohta
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Journal Title
Journal of the Physical Society of Japan
Volume: 89
Issue: 5
Pages: 054703-054703
DOI
NAID
Related Report
Peer Reviewed / Open Access
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[Journal Article] Observation of metal to nonmagnetic insulator transition in polycrystalline RuP by photoemission spectroscopy2020
Author(s)
Daiki Ootsuki, Kei Sawada, Hiroki Goto, Daigorou Hirai, Daisuke Shibata, Masato Kawamoto, Akira Yasui, Eiji Ikenaga, Masashi Arita, Hirofumi Namatame, Masaki Taniguchi, Tatsuya Toriyama, Takehisa Konishi, Yukinori Ohta, Naurang L. Saini, Teppei Yoshida, Takashi Mizokawa, Hidenori Takagi
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Journal Title
Physical Review B
Volume: 101
Issue: 16
DOI
NAID
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Large entropy change derived from orbitally assisted three-centered two-electron σ bond formation in metallic Li0.33VS22018
Author(s)
Katayama N., Tamura S., Yamaguchi T., Sugimoto K., Iida K., Matsukawa T., Hoshikawa A., Ishigaki T., Kobayashi S., Ohta Y., Sawa H.
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Journal Title
Physical Review B
Volume: 98
Issue: 8
DOI
Related Report
Peer Reviewed
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[Presentation] 低エネルギー逆光電子分光によるTa2NiSe5の伝導帯の直接観測2020
Author(s)
川村啓太, 佐藤晴輝, 折尾響, 杉本高大, 太田幸則, 大槻太毅, 吉田鉄平, 丸岡うらら, 中埜彰俊, 寺崎一郎, 吉田弘幸
Organizer
日本物理学会2020年秋季大会
Related Report
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[Presentation] 光電子分光によるRuPの金属－非磁性絶縁体転移の観測2018
Author(s)
大槻太毅, 澤田慶, 柴田大輔, 川本雅人, 吉田鉄平, N. L. Saini, 溝川貴司, 後藤広樹, 小西健久, 太田幸則, 保井晃, 池永英司, 有田将司, 生天目博文, 谷口雅樹, 平井大悟郎, 高木英典
Organizer
日本物理学会2018年秋季大会
Related Report
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