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Chin. Phys. B, 2022, Vol. 31(11): 110304    DOI: 10.1088/1674-1056/ac8739
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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) $MXY$ ($M={\rm Mo}$, W, $etc$. and $X, Y={\rm S}$, Se, $etc$.) 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 $T_{\rm c}$, of which the Fermi surface (FS) sheets centered around both $ărGamma$ and $K (K')$ 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 $s + f + p$-wave mixed superconducting state, which is fully gapped and topologically nontrivial, $i.e.$, a $\mathbb{Z}_2$ topological state. On the other hand, a time-reversal symmetry breaking $d + p + f$-wave superconducting state appears at lower chemical potentials. This state possess a large Chern number $|C|=6$ 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.
Keywords:  topological      superconductivity      Janus      transition metal dichalcogenides (TMDs)  
Received:  08 June 2022      Revised:  19 July 2022      Accepted manuscript online:  05 August 2022
PACS:  03.65.Vf (Phases: geometric; dynamic or topological)  
  74.20.Rp (Pairing symmetries (other than s-wave))  
  74.25.Dw (Superconductivity phase diagrams)  
  82.45.Mp (Thin layers, films, monolayers, membranes)  
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).
Corresponding Authors:  Zuo-Dong Yu, Wei-Peng Chen     E-mail:;

Cite this article: 

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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