【学术视频】第五届全国统计物理与复杂系统学术会议 | 中科院物理所高鸿钧院士
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图 | 高鸿钧
题 目:Observation of Majorana Bound States in an Iron-Based Superconductor
报告人:高鸿钧
单 位:中国科学院物理研究所
时 间:2019-07-27
地 点:中国科学技术大学
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报告摘要
Majorana bound states (MBSs) in condensed matter systems have attracted tremendous interest owing to their non-Abelian statistics and potential applications in topological quantum computation. A MBS is theoretically predicted to emerge as a spatially localized zero-energy mode in certain pwave topological superconductors in one and two dimensions. Two-dimensional topological superconductors have been predicted to host MBSs as zero-energy modes in vortex cores. In this lecture, I will present an observation of a sharp zero-bias peak inside a vortex core that doesn’t split when moving away from the vortex center by using 400 mK-high magnetic field (11 T) scanning tunneling microscopy/ spectroscopy (STM/ STS) on superconducting Dirac surface state of an ironbased superconductor FeTe0.55Se0.45 with a superconducting transition temperature of 14.5 K. The evolution of the peak under varying magnetic field, temperature, and tunneling barrier is consistent with the tunneling to a nearly pure MBS, separated from non-topological bound states. Furthermore, I will talk about the observation of the Majorana conductance plateau in vortices on the FeTe0.55Se0.45 surface by using 40 mK-(9 2 2) T STM/ STS. These observations offer a potential platform for realizing and manipulating MBSs at a relatively high temperature.
个人简介
会议简介
全国统计物理与复杂系统学术会议由中国科学院理论物理研究所主办,是我国统计物理与复杂系统领域最具影响力的学术活动,每两年举办一届。第五届全国统计物理与复杂系统学术会议于2019年7月26日至7月29日在安徽举行,会议主要以邀请报告、口头报告及张贴报告的形式,交流国内外统计物理与复杂系统领域的最新进展,同时讨论中国统计物理与复杂系统研究的现状与发展趋势。此次会议由中国科学院理论物理研究所主办,中国科学技术大学承办,安徽大学、安庆师范大学、安徽师范大学协办。
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