The Kavli ITS workshop - Majorana Modes | Tetsuo Hanaguri

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 | Tetsuo Hanaguri

题目：Nature of the Zero-Energy Vortex Bound State in Fe (Se, Te)

报告人：Tetsuo Hanaguri

单位：RIKEN CEMS

时间：2019年1月8日-11日

地点：中国科学院大学卡弗里理论科学研究所

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报告摘要

Bulk superconductors with a topological surface state attract much attention because vortex cores at the surface can accommodate Majorana quasiparticles. We performed ultra-low-temperature spectroscopic-imaging STM experiments on Fe（Se, Te）that host superconducting topological surface state. We found various chemical and electronic quenched disordersat the surface and two kinds of vortices with and without zero-energy vortex bound state, which may represent the Majorana quasiparticle. Interestingly, there is no clear correlation between the quenched disorders and thezero-energy vortex bound state. We argue that a disorder in the vortex latticemay play a role for the appearance of the zero-energy vortex bound state.

个人简介

Dr. Tetsuo Hanaguri, Team Leader, Emergent Phenomena Measurement Research Team, RIKEN Center for Emergent Mater Science, Japan. Research Interests: Experimental condensed-matter physics, Superconductivity, Topological quantum phenomena, Measurement science and technology. Honors: 1992 Research Fellow, Japan Society for the Promotion of Science. 2009 13th Superconductivity Science & Technology Award from the Society of Non-traditional Technology, Japan. Membership: The Physical Society of Japan, American Physical Society.

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