Unconventional Pairing Induced Anomalous Transverse Shift in Andreev Reflection

报告题目: Unconventional Pairing Induced Anomalous Transverse Shift in Andreev Reflection

报告人:余智明新加坡科技设计大学

报告时间:20181010 日 上午 10:00-11:00

报告地点:凤鸣楼 101   (高等研究院)

报告摘要:Superconductors with unconventional pairings have been a fascinating subject of research, for which a central issue is to explore effects that can be used to characterize the pairing. The process of Andreev reflection---the reflection of an electron as a hole at a normal-mental-superconductor interface---offers a basic mechanism to probe the pairing. Here we predict that in Andreev reflection from unconventional superconductors, the reflected hole acquires an anomalous spatial shift normal to the plane of incidence, arising from the unconventional pairing. The transverse shift is sensitive to the superconducting gap structure, exhibiting characteristic features for each pairing type, and can be detected as voltage signals. Our work not only unveils a fundamentally new effect with a novel underlying mechanism, but also suggests a possible new technique capable of probing the structure of unconventional pairings.

References:

1.Ying Liu, Zhi-Ming Yu*, and Shengyuan A. Yang, “Transverse Shift in Andreev Reflection,” Phys. Rev. B Rapid Comm. 96, 121101 (2017).

2.Zhi-Ming Yu, Ying Liu, Yugui Yao, and Shengyuan A. Yang, “Unconventional pairing induced anomalous transverse shift in Andreev reflection,” arXiv:1708.06915. Accepted in Phys. Rev. Lett..

报告人简介:余智明,江西鄱阳人。2006年毕业于华中科技大学物理学系,2008-2014年在中国人民大学读凝聚态物理研究生,获博士学位。2014-2016年在北京理工大学姚裕贵教授课题组做博士后。2016年起在新加坡科技设计大学杨声远教授课题组做博士后。研究课题主要集中于二维材料/拓扑材料的物理性质:包括拓扑半金属,拓扑绝缘体,二维材料和纳米结构的物理性质,自旋和谷电子学,散射中的反常位移及量子输运等。

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