Topological superconductors have attracted tremendous interest for hosting Majorana bound states on their boundaries, which are potential in realizing quantum computations. One promising approach to engineer topological superconductors is to discovery superconductors with nontrivial topology in their electronic band structure. In this talk, I will introduce our recent work on exploration of such materials. Specifically, I will first talk about our high-pressure measurement on the topological nodal-line semimetal SrAs₃, which induces a Lifshitz transition below 1 GPa and then superconductivity at 20.6 GPa associated with a structural phase transition. The new cubic SrAs₃ phase is found to host not only superconductivity but also a topological crystalline insulator state. I then will introduce our recent high magnetic field magnetotransport measurement on the layered superconductor TaSe₃, which reveals the existence of a strong topological insulator state.

References:

[1] E. J. Cheng, et al. arXiv:1910.02603.

[2] W. Xia, et al. under preparation.

郭艳峰, 上海科技大学物质科学与技术学院研究员、终身制序列助理教授、博导、课题组长，上海市东方学者、浦江人才计划获得者。2008年硕博连读毕业于中科院物理研究所；2008年至2012年日本国立材料研究所（NIMS）博士后；2012年至2015年牛津大学物理系博士后；2015年加入上科大任现职。长期从事新量子物质材料探索、高质量单晶生长及物理性质研究。已在Nature Materials, Nature Physics, Physical Review Letters, Journal of the American Chemical Society等学术期刊发表论文80多篇，总引用次数逾1700次。