【学术视频】The Kavli ITS workshop - Majorana Modes | 香港科技大学戴希教授

The Kavli ITS workshop on “Majorana Modes in Topological Superconductors” was held at the Kavli Institute for Theoretical Sciences (Kavli ITS) at UCAS in Beijing from January 8-11, 2019. The workshop mainly focuses on the realization and application of elusive Majorana modes in topological superconductors.

Majorana particles, which are their own antiparticles, have been of considerable interest for quantum computing in solid state systems since the zero-bias peak of the conductance was observed in the semiconductor nanowires. Now there are multiple experimental hints to support the potential existence of the Majorana states possessing zero energy. Since Majorana states can form qubits for quantum computations, once the Majorana states are able to be fully controlled and manipulated, the number of the Majorana qubits can be scalable to accelerate the speed of the quantum computation.

The scope of this workshop is to discuss the recent topics in Majorana bound states and Chiral Majorana edge modes in class D, aiming at promoting new collaborations among participants and seeking practical implementations to use Majorana modes for quantum computation. Furthermore, in the workshop, there will be a discussion session focusing on Majorana physics in the vortices of the topological superconductors.

图 | Xi Dai

题目：Quantum Anomalous Vortex & Majorana Zero Mode in Fe₁+_y(Te1-_xSe_x) Superconductors

报告人：戴希

单位：香港科技大学

时间：Jan. 8th-11th, 2019

地点：University of Chinese Academy of Sciences

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报告摘要

In topological insulators doped with magnetic ions, spin-orbit coupling and ferromagnetism give rise to the quantum anomalous Hall effect. Here we show that in s-wave superconductors with strong spin-orbit coupling, magnetic impurity ions can generate topological vortices in the absence of external magnetic fields. Such vortices, dubbed quantum anomalous vortices, support robust Majorana zero-energy modes when superconductivity is induced in the topological surface states. We demonstrate that the zero-energy bound states observed in Fe(Te,Se) superconductors are possible realizations of the Majorana zero modes in quantum anomalous vortices produced by the interstitial magnetic Fe. The quantum anomalous vortex matter not only advance fundamental understandings of topological defect excitations of Cooper pairing, but also provides new and advantageous platforms for manipulating Majorana zero modes in quantum computing.

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个人简介

戴希教授，1993年毕业于浙江大学材料系，1999年在中国科学院理论物理研究所获得博士学位。1999年至2005年先后在香港、美国等国家和地区的多个高等研究机构工作，长期从事强关联理论及计算方面的研究工作。2005年回国在中科院物理研究所工作，任研究员、博士生导师。2009年任北京凝聚态物理国家实验室副主任，2017年10月加入香港科技大学担任教授。现任香港科技大学物理学系讲座教授，2012年度荣获国际华人物理与天文学亚洲学术成就奖，2014年获得香港周光召基金会授予的基础科学奖，2017年获得中国物理学会周培源物理奖。

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