Measurement of Superconductivity and Edge States in Topological Superconductor Candidate TaSe3

• 作者: Shuai Liu Si-Min Nie Yan-Peng Qi Yan-Feng Guo Hong-Tao Yuan Le-Xian Yang Yu-Lin Chen Mei-Xiao Wang Zhong-Kai Liu
• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2021,（7）
• 所属期刊栏目: CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES
• 页码范围: 153-158
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/0256-307X/38/7/077302

摘要

Topological superconductors (TSCs) have been widely investigated in recent years due to their novel physics and ability to host Majorana fermions (MFs) which are key to topological quantum computation.Despite the great interest,only a few compounds have been proposed as candidates of intrinsic TSCs,such as iron-based superconductor FeSe0.55Te0.45 and 2M-WS2.Among them,quasi-one-dimensional superconductor TaSe3 possesses fascinating properties such as its simple stoichiometry,layered nature and chemical stability.Here,using scanning tunneling microscope/spectroscopy (STM/STS),we systematically investigate the topography and electronic structure of TaSe3.Our STM/STS measurement reveals large atomically flat,defect-free surfaces suitable for the search of MF;electronic density of states consistent with our angle-resolved photoemission result and band-structure calculations,and a uniform superconducting gap with a typical size of ～0.25 meV.Remarkably,additional edge states are observed in the vicinity of the terrace edge,suggesting they may have a topological origin.Our result proves the coexistence of superconductivity and topological electronic structure in TaSe3,making it an intriguing platform to investigate topological superconductivity.