Novel Edge Phenomena in Spin-Triplet Superfluids

2014 Fiscal Year Final Research Report

• Project Area: Topological Quantum Phenomena in Condensed Matter with Broken Symmetries
• Project/Area Number: 22103003
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Osaka City University
• Principal Investigator: ISHIKAWA Osamu 大阪市立大学, 大学院理学研究科, 教授 (90184473)
• Co-Investigator(Kenkyū-buntansha): NOMURA Ryuji 東京工業大学, 大学院理工学研究科(理学系), 助教 (00323783) ; HIGASHITANI Seiji 広島大学, 総合科学研究科, 准教授 (70304368) ; MIYAKE Kazumasa 公益財団法人豊田理化学研究所, 常勤フェロー (90109265) ; TAKAGI Takeo 福井大学, 工学研究科, 教授 (00206723) ; NAKAHARA Mikio 近畿大学, 理工学部, 教授 (90189019) ; IKEGAMI Hiroki 独立行政法人理化学研究所, 主任研究員研究室, 専任研究員 (70313161)
• Co-Investigator(Renkei-kenkyūsha): OBARA Ken 大阪市市立大学, 大学院理学研究科, 講師 (50347481) ; MATSUMOTO Koichi 金沢大学, 理工研究域, 教授 (10219496) ; TAKEUCHI Hiromitsu 大阪市立大学, 大学院理学研究科, 講師 (10587760) ; KUBOTA Minoru 東京大学, 物性研究所, 准教授 (60192035)
• Project Period (FY): 2010-04-01 – 2015-03-31
• Keywords: 超流動3He / スピン三重項超流体 / 固有軌道角運動量 / 表面マヨラナ状態 / 奇周波数クーパー対 / トポロジカル超流体 / 半整数量子渦 / トポロジカル量子現象

Outline of Final Research Achievements

Superfluid 3He has two types of superfluid state, one is the time reversal symmetry breaking A phase and another is the orbit-spin symmetry breaking B phase. We have investigated the topological quantum phenomena at the interface or the boundary and obtained notable results as below. We showed the first evidence of the macroscopic angular momentum in the A phase and that of the Majorana cone of the surface bound state in the B phase. The local chirality of the A phase is also observed. We theoretically concluded that the density of state at the surface exactly corresponds to the amplitude of odd frequency pairing state. We also established new method of considering the odd frequency bulk superconductor, which includes the Meissner effect, by using the retarded pairing potential.

Free Research Field

超低温物理学・核磁気共鳴・流体物理学