2014 Fiscal Year Final Research Report
Novel Edge States in Superconductors with Broken Time-Reversal Symmetry
| Project Area | Topological Quantum Phenomena in Condensed Matter with Broken Symmetries |
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| Project/Area Number |
22103002
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| Research Category |
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
KASHIWAYA Satoshi 独立行政法人産業技術総合研究所, 電子光技術研究部門, 首席研究員 (40356770)
ASANO Yasuhiro 北海道大学, 大学院工学研究院, 准教授 (20271637)
IRIE Hiroshi 日本電信電話株式会社NTT 物性科学基礎研究所, 量子電子物性研究部, 研究員 (20646856)
AKAZAKI Tatsushi 高知工業高等専門学校, 電気情報工学科, 教授 (10393779)
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| Co-Investigator(Renkei-kenkyūsha) |
TERASHIMA Takahito 京都大学, 低温物質科学研究センター, 教授 (40252506)
YONEZAWA Shingo 京都大学, 大学院理学研究科, 助教 (30523584)
ISHIDA Kenji 京都大学, 大学院理学研究科, 教授 (90243196)
MAEKAWA Sadamichi 独立行政法人日本電子力研究開発機構, 先端基礎研究センター研究推進室, センター長 (60005973)
KASHIWAYA Hiromi 独立行政法人産業技術総合研究所, 計測フロンティア研究部門, 主任研究員 (60443181)
MURAKI Koji 日本電信電話株式会社NTT 物性科学基礎研究所, 量子電子物性研究部, グループリーダー (90393769)
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| Project Period (FY) |
2010-04-01 – 2015-03-31
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| Keywords | トポロジカル量子現象 / カイラル超伝導 / ルテニウム酸化物 / スピン三重項超伝導 / 超伝導接合 / エッジ状態 |
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| Outline of Final Research Achievements |
To clarify the topological quantum phenomena, especially novel surface/interface phenomena, in superconductors with broken time-reversal symmetry, we investigated ruthenate superconductor Sr2RuO4 and its eutectic, as well as hybrid systems consisting of a conventional superconductor and a ferromagnet.
We discovered the half-quantum flux state in micro-rings of Sr2RuO4, and in-gap density of states indicating its chiral-edge mode. We also accumulated new facts concerning its superconducting symmetry, such as reconfirming evidence for spin-triplet pairing from NMR and the first-order superconducting transition under in-plane magnetic fields. We deepened our knowledge of the odd-frequency pairing state characteristic of topological superconductivity. We developed a hybrid system of ferromagnetic thin film of SrRuO3 deposited on the Sr2RuO4 crystal surface, which is ideal for the investigation of novel proximity effects involving odd-frequency pairing.
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| Free Research Field |
低温物理学実験・超伝導
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