题目

Topological Superconductor and Majorana Zero Mode in the Vortex

报告人

Prof. Jin-Feng Jia(贾金锋）

Key Laboratory of Artificial Structures and Quantum Control, School of Physics and Astronomy, Shanghai Jiao Tong University

时间

2019年5月22日（星期三）下午2：00

地点

微尺度国家研究中心一楼科技展厅

贾金锋，1987年本科毕业于北京大学物理系，1992年北京大学物理系获博士学位，现任上海交通大学讲席教授。在SCI收录的杂志上发表文章250多篇，文章被引用11000多次，被选为2018年Highly cited research（Clarivate Analytics）。曾获2016年教育部自然科学一等奖；2013年全球华人物理学会“亚洲成就奖”；2011年国家自然科学二等奖（第一获奖人）；2011年香港求是科技基金会“杰出科技成就集体奖”；2004年国家自然科学二等奖（第三获奖人）；2003年北京市科学技术奖一等奖；1997年国家教育委员会科技进步一等奖等重要奖项。国家杰出青年基金获得者（2003）、国家教育部“长江学者奖励计划”特聘教授（2009）。

报告摘要

Majorana zero mode (MZM) can be used in fault-tolerant quantum computation relying on their non-Abelian braiding statistics, therefore, lots of efforts have been made to find them. Signatures of the MZM have been reported as zero energy modes in various systems. As predicted, MZM in the vortex of a topological superconductor appears as a zero energy mode with a cone like spatial distribution. Also, MZM can induce spin selective Andreev reflection (SSAR), a novel magnetic property which can be used to detect the MZM.Here, I will show you that the Bi₂Te₃/NbSe₂ hetero-structure is an artificial topological superconductor and all the three features are observed for the MZM inside the vortices on the Bi₂Te₃/NbSe₂. Especially, by using spin-polarized scanning tunneling microscopy/spectroscopy (STM/STS), we observed the spin dependent tunneling effect, which is a direct evidence for the SSAR from MZM, and fully supported by theoretical analyses. More importantly, all evidences are self-consistent. Our work provides definitive evidences of MZM and will stimulate the MZM research on their novel physical properties, hence a step towards their statistics and application in quantum computing.

References:

1. M. X. Wang, et al., Science 336, 52-55 (2012).

2. J. P. Xu, et al., Phys. Rev. Lett. 112, 217001 (2014).

3. J. P. Xu, et al., Phys. Rev. Lett. 114, 017001 (2015).

4. H. H Sun, et al.,Phys. Rev. Lett. 116, 257003 (2016).

5. H. H. Sun, Jin-Feng Jia, NPJ Quan. Mater. 2, 34 (2017).