Physics of Odd-frequency pairings Theory and Experiment

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H03686
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Nagoya University
• Principal Investigator: Tanaka Yukio 名古屋大学, 工学研究科, 教授 (40212039)
• Co-Investigator(Kenkyū-buntansha): 柏谷 聡 国立研究開発法人産業技術総合研究所, その他部局等, 首席研究員 (40356770)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 超伝導対称性 / 超伝導近接効果 / マヨラナフェルミオン / 2重量子ドット / スピン3重項超伝導体

Outline of Final Research Achievements

Odd-frequency pairing is an exotic pairing which has a sign change of the exchange of time of electrons forming Cooper pair. From the theoretical side, we have studied
(1)Influence of the impurity scattering in unconventional superconductor / normal metal junctions on the charge transport profile including charge conductance and shot noise (2)Non-local conductance in the superconductor double quantum dot hybrid system (3)Double semiconductor nano-wires on the superconductor from the view point of odd-frequency pairings. Also, we have studied two channel Kondo lattice where bulk odd-frequency gap function is realized. We have calculated tunneling conductance and Josephson current in this model. Experimentally,　we have measured a surface impedance of Au/ Sr2RuO4 junctions. We have found anomalous temperature dependence as compared to conventional superconductor Al. We have also developed a suspended normal metal type tunneling junction refrigerator.

Free Research Field

凝縮系物理学の理論