Topological superconductors (TSCs), with the capability to host Majorana bound states that can lead to non-Abelian statistics and application in quantum computation, have been one of the most intensively studied topics in condensed matter physics recently. Up to date, only a few compounds have been proposed as candidates of intrinsic TSCs, such as doped topological insulator CuxBi2Se3 and iron-based superconductor FeTe0.55Se0.45. Here, by carrying out synchrotron and laser based angle-resolved photoemission spectroscopy (ARPES), we systematically investigated the electronic structure of a quasi-1D superconductor TaSe3, and identified the nontrivial topological surface states. In addition, our scanning tunneling microscopy (STM) study revealed a clean cleaved surface with a persistent superconducting gap, proving it suitable for further investigation of potential Majorana modes. These results prove TaSe3 as a stoichiometric TSC candidate that is stable and exfoliable, therefore a great platform for the study of rich novel phenomena and application potentials.
@article{arxiv.2009.02002,
title = {Observation of topological electronic structure in quasi-1D superconductor TaSe3},
author = {Cheng Chen and Aiji Liang and Shuai Liu and Simin Nie and Junwei Huang and Meixiao Wang and Yiwei Li and Ding Pei and Haifeng Yang and Huijun Zheng and Yong Zhang and Donghui Lu and Makoto Hashimoto and Alexei Barinov and Chris Jozwiak and Aaron Bostwick and Eli Rotenberg and Xufeng Kou and Lexian Yang and Yanfeng Guo and Zhijun Wang and Hongtao Yuan and Zhongkai Liu and Yulin Chen},
journal= {arXiv preprint arXiv:2009.02002},
year = {2020}
}