Kavli ITS Workshop-Majorana Modes | Lingyuan Kong

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 consider able 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 computation, 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| Lingyuan Kong

题目：Majorana Bound States in an-grown FeTe_0.55Se_0.45

报告人：Lingyuan Kong

单位：Institute of Physics, Chinese Academy of Sciences

时间：2019年1月8日-11日

地点：卡弗里理论科学研究所

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报告摘要

Majorana bound states (MBS) can emerge as zero-energy quasi-particle excitations in a vortex core of superconducting topological surface states. Inspired by Fu-Kane model, we raised a new and promising platform (FeTe_0.55Se_0.45) supporting Majorana-type excitations, which does not require complicated hererostructure fabrications.

Previously, our low temperature STM experiments show non-split zero bias peak (ZBP) across a vortex core. Its intensity line-profile was reproduced very well by a theoretical model of topological surface states. Temperature evolution of ZBP shows enhanced suppression at lifting temperatures, which indicates the bulk component may poison ZBP by thermal quasi-particles over the mini-gap inside bulk vortex line. Although those observations provide strong evidence towards MBS, the behavior of ZBP alone is not enough to prove it. Recently, we performed thorough studies onvortices of FeTe_0.55Se_0.45, the topological nature of MBS was distinguished under a global view. 

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