Topological superconductivity in Janus monolayer transition metal dichalcogenides
Xian-Dong Li(李现东)1, Zuo-Dong Yu(余作东)1,2,†, Wei-Peng Chen(陈伟鹏)3,‡, and Chang-De Gong(龚昌德)1,4,5
1 National Laboratory of Solid State Microstructure, Department of Physics, Nanjing University, Nanjing 210093, China; 2 School of Information and Electronic Engineering, Zhejiang Gongshang University, Hangzhou 310018, China; 3 Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China; 4 Center for Statistical and Theoretical Condensed Matter Physics, Zhejiang Normal University, Jinhua 321004, China; 5 Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
Abstract The Janus monolayer transition metal dichalcogenides (TMDs) (, W, . and , Se, .) have been successfully synthesized in recent years. The Rashba spin splitting in these compounds arises due to the breaking of out-of-plane mirror symmetry. Here we study the pairing symmetry of superconducting Janus monolayer TMDs within the weak-coupling framework near critical temperature , of which the Fermi surface (FS) sheets centered around both ă and points. We find that the strong Rashba splitting produces two kinds of topological superconducting states which differ from that in its parent compounds. More specifically, at relatively high chemical potentials, we obtain a time-reversal invariant -wave mixed superconducting state, which is fully gapped and topologically nontrivial, , a topological state. On the other hand, a time-reversal symmetry breaking -wave superconducting state appears at lower chemical potentials. This state possess a large Chern number at appropriate pairing strength, demonstrating its nontrivial band topology. Our results suggest the Janus monolayer TMDs to be a promising candidate for the intrinsic helical and chiral topological superconductors.
Fund: We acknowledge Wei-Jian Li for useful discussions. Xian-Dong Li also thanks Ai-Lei He for helpful suggestions. Project supported by the National Natural Science Foundation of China (Grant No. 11904155).
Xian-Dong Li(李现东), Zuo-Dong Yu(余作东), Wei-Peng Chen(陈伟鹏), and Chang-De Gong(龚昌德) Topological superconductivity in Janus monolayer transition metal dichalcogenides 2022 Chin. Phys. B 31 110304
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