【学术视频】固态量子器件暑期学校与国际学术研讨会 | 中科院理论所Panagiotis Kotetes博士

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图 | Panagiotis Kotetes

题   目：Aspects of hybridization, topology, and Majorana manipulations in super-semi hybrids (Lecture 1)

The rise of synthetic topology & chiral anomaly in Majorana-Josephson devices (Lecture 2) 

报告人：Panagiotis Kotetes

单   位：中科院理论物理研究所

时   间：2019-08-27

地   点：北京大学

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报告摘要

(Lecture 1): In this intro Lecture, I will focus on three key aspects of topological superconductivity in hybrid devices. (i) First, I will discuss the proximity effect from a self-consistent Schrödinger - Poisson viewpoint. Based on numerical and analytical methods，I will bring forward a number of material aspects which control the degree of hybridization in these devices, as well as the arising topological properties. (ii) After briefly introducing the general framework for the classification of topological systems，I will analyze hybrid devices which harbor multiple Majorana bound states (MBSs) per edge, that are protected by either a Kramers degeneracy or a sublattice symmetry. (iii) Finally, I will conclude with properties of coupled MBSs, e.g. the 4π - Josephson effect,and review two routes to perform braiding, i.e. by direct MBS exchange, and effectively.

(Lecture 2): In this talk, I demonstrate how to design various nonstandard types of Andreev-bound-state (ABS) dispersions, via a composite construction relying on Majorana bound states (MBSs). Here, the MBSs appear at the interface of a Josephson junction consisting of two topological superconductors (TSCs). Each TSC harbors multiple MBSs per edge by virtue of a chiral or a unitary symmetry. My collaborators and I have found that, while the ABS dispersions are - periodic, they still contain multiple crossings which are protected by the conservation of fermion parity. Our findings open perspectives for topological band structures with nodes or Weyl points in synthetic dimensions, the realization of chiral anomaly and, finally, the possibility for fermion - parity pumping with a cycle set by the ABS - dispersion details. The successful experimental demonstration of ABS engineering in these devices, further promises to unveil new paths for the indirect detection of MBSs.

个人简介

Panagiotis Kotetes， 2005年7月本科毕业于雅典国立技术大学的应用数学与物理系；于2011年5月雅典国立技术大学获得博士学位，自2011年-2015年，在德国卡尔斯鲁厄理工学院做博士后研究，期间担任助教以及硕士生导师工作，2015年-2018年在丹麦哥本哈根大学尼尔斯玻尔研究所担任博士后，2019年至今，任ITP-CAS副教授。

会议简介

为普及固态量子器件与量子计算芯片前沿技术领域基本知识，吸引国内年轻学者和优秀研究生投身于固态量子器件研究，打好量子计算理论、半导体量子点量子比特器件和拓扑超导量子器件物理等专业方向基础，培养年轻学者和学生的科研创造能力，并为其提供近距离了解和认识国内外固态量子器件前沿的校园创新研究平台，北京大学《固态量子器件北京市重点实验室》于2019年8月举办固态量子器件暑期学校和国际固态量子器件研讨会。主办方：北京大学信息科学技术学院、半导体纳米结构物理与量子器件实验室—— ——往期精彩回顾—— ——

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