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Observation of Topological Electronic Structure in Quasi-1D Superconductor TaSe3

Cheng Chen,Aiji Liang,Shuai Liu,Simin Nie,Junwei Huang,Meixiao Wang,Yiwei Li,Ding Pei,Haifeng Yang,Huijun Zheng,Yong Zhang,Donghui Lu,Makoto Hashimoto,Alexei Barinov,Chris Jozwiak,Aaron Bostwick,Eli Rotenberg,Xufeng Kou,Lexian Yang,Yanfeng Guo,Zhijun Wang,Hongtao Yuan,Zhongkai Liu,Yulin Chen

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. To date, only a few compounds have been proposed as candidates of intrinsic TSCs, such as doped topological insulator Cu x Bi 2 Se 3 and iron-based superconductor FeTe 0.55 Se 0.45 . Here, by carrying out synchrotron- and laser-based angle-resolved photoemission spectroscopy, we systematically investigated the electronic structure of a quasi-one-dimensional superconductor TaSe 3 and identified the non-trivial topological surface states. In addition, our scanning tunneling microscopy study revealed a clean cleaved surface with a persistent superconducting gap, proving it suitable for further investigation of potential Majorana modes. These results prove TaSe 3 as a stoichiometric TSC candidate that is stable and exfoliable and therefore a promising platform for the study of rich novel phenomena and application potentials.