Theory of spin and heat transport in topological insulator/superconductor junctions

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H03525
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Nanostructural physics
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: KAWABATA SHIRO 国立研究開発法人産業技術総合研究所, エレクトロニクス・製造領域, 研究グループ長 (30356852)
• Co-Investigator(Kenkyū-buntansha): 浅野 泰寛 北海道大学, 工学研究院, 准教授 (20271637)
• Co-Investigator(Renkei-kenkyūsha): TOMINAGA JYUNJI 産業技術総合研究所, ナノエレクトロニクス研究部門, 首席研究員 (10357577)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: トポロジカル絶縁体 / 超伝導接合 / 熱輸送 / トポロジカル超伝導体 / マヨラナ粒子 / ワイル半金属 / スピントロニクス / 電子冷却

Outline of Final Research Achievements

We have investigated the thermal and quantum transport in superconductor/topological meterial hybrid systems theoretically and numerically.　Due to the suppression of the Andreev reflection by the topological spin-momentum locking induced by the spin-orbit interaction, the cooling power of the system is found to be higher than that for conventional coolers. Therefore we can extract large amount of heat from normal metals. We also have investigated the electron transport in superconducting single-electron devices and found that the heating by thermal quasiparticles gives large influences on electron transport. In addition, we have theoretically investigated several properties of chiral topological superconductors, Josephson effect through anomalous hall insulator, and impurity effect in carrier doped topological insulators.

Free Research Field

超伝導量子レレクトロニクス