Search for topological phase transition induced by broken inversion symmetry
Project/Area Number |
17K18753
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Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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Allocation Type | Multi-year Fund |
Research Field |
Condensed matter physics and related fields
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Research Institution | Kyoto University |
Principal Investigator |
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Research Collaborator |
Naritsuka Masahiro
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Project Period (FY) |
2017-06-30 – 2019-03-31
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Project Status |
Completed (Fiscal Year 2018)
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Budget Amount *help |
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
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Keywords | トポロジカル物性 / 超伝導 / 人工超格子 / 非従来型超伝導 / 空間反転対称性の破れ / トポロジカル物質 / 空間反転対称性 / トポロジカル相転移 / 超格子 / 電界効果 / 一軸応力 |
Outline of Final Research Achievements |
We have fabricated artificial superlattices using heavy-fermion superconductors to control topological phase transition and to create exotic superconducting state by artificially introducing broken inversion symmetry. In CeCoIn5/YbCoIn5/YbRhIn5 tricolor superlattice, global inversion symmetry breaking is artificially introduced in two-dimensional heavy fermion superconductors. We found an anomalous enhancement of the upper critical field at low temperature, suggesting the appearance of a new high-field superconducting phase, which has been theoretically predicted in superconductors without inversion symmetry. In superlattices comprised of heavy-fermion superconductor CeCoIn5 and antiferromagnet CeRhIn5, pairing interaction is largely enhanced by injecting the antiferromagnetic fluctuations into superconducting layer from adjacent antiferromagnetic layer through the interfaces.
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Academic Significance and Societal Importance of the Research Achievements |
空間反転対称性の破れの人工導入や界面を通じた反強磁性揺らぎの注入により、超伝導状態を大きく制御できることが明らかとなった。特に前者ではトポロジカル超伝導の発現が理論的に指摘されているが、通常の物質では空間反転対称性の破れは結晶構造によって決定されてしまうため、空間反転対称性の破れを制御することが困難な状況であり、物質探索に依存していた状況であった。これに対し、人工超格子を用いた手法は連続制御が可能であり、トポロジカル超伝導の新しい探索手法を提示するものである。
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Report
(3 results)
Research Products
(28 results)
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[Journal Article] Discovery of Emergent Photon and Monopoles in a Quantum Spin Liquid2018
Author(s)
Y. Tokiwa, T. Yamashita, D. Terazawa, K. Kimura, Y. Kasahara, T. Onishi, Y. Kato, M. Halim, P. Gegenwart, T. Shibauchi, S. Nakatsuji, E.-G. Moon, Y. Matsuda
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Journal Title
Journal of the Physical Society of Japan
Volume: 印刷中
NAID
Related Report
Peer Reviewed
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[Journal Article] Unusual Thermal Hall Effect in a Kitaev Spin Liquid Candidate α-RuCl32018
Author(s)
K. Kasahara, K. Sugii, T. Ohnishi, M. Shimozawa, M. Yamashita, N. Kurita, H. Tanaka, J. Nasu, M. Motome, T. Shibauchi, Y. Matsuda
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Journal Title
Physical Review Letters
Volume: 印刷中
Related Report
Peer Reviewed
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[Presentation] Kitaevスピン液体における半整数量子熱ホール効果の観測2018
Author(s)
馬斯嘯, 笠原裕一, 大西隆史, 杉井かおり, 下澤雅明, 山下穣, 栗田伸之, 田中秀数, 那須譲治, 求幸年, 芝内孝禎, 松田祐司
Organizer
日本物理学会第73回年次大会
Related Report
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[Presentation] Observation of half-integer thermal Hall conductance in a Kitaev quantum magnet2018
Author(s)
Y. Kasahara, K. Sugii, T. Ohnishi, M. Shimozawa, M. Yamashita, N. Kurita, H. Tanaka, J. Nasu, Y. Motome, T. Shibauchi, Y. Matsuda
Organizer
The American Physical Society March Meeting 2018
Related Report
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[Presentation] α-RuCl3のKitaevスピン液体状態におけるマヨラナカイラルエッジ電流2017
Author(s)
大西隆史, 笠原裕一, 杉井かおり, 下澤雅明, 山下穣, 常盤欣文, 栗田伸之, 田中秀数, 那須譲二, 求幸年, 芝内孝禎, 松田祐司
Organizer
日本物理学会2017年秋季大会
Related Report
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