Topological superconductivity in Janus monolayer transition metal dichalcogenides

Li, Xian-Dong1; Yu, Zuo-Dong1,2; Chen, Wei-Peng3; Gong, Chang-De1,4,5

2022-11-01

10.1088/1674-1056/ac8739

Chinese Physics B   影响因子和分区

1674-1056

2058-3834

The Janus monolayer transition metal dichalcogenides (TMDs) MXY (M = Mo, W, etc. and X, Y = 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 (c), of which the Fermi surface (FS) sheets centered around both Gamma 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 DOUBLE-STRUCK CAPITAL 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.

topological superconductivity Janus transition metal dichalcogenides (TMDs)

SCI

英语

通讯

[11904155]

Physics

Physics, Multidisciplinary

WOS:000880114300001

IOP Publishing Ltd

Web of Science

1.Nanjing Univ, Dept Phys, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China
2.Zhejiang Gongshang Univ, Sch Informat & Elect Engn, Hangzhou 310018, Peoples R China
3.Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China
4.Zhejiang Normal Univ, Ctr Stat & Theoret Condensed Matter Phys, Jinhua 321004, Peoples R China
5.Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Peoples R China

Li, Xian-Dong,Yu, Zuo-Dong,Chen, Wei-Peng,et al. Topological superconductivity in Janus monolayer transition metal dichalcogenides[J]. Chinese Physics B,2022,31(11).

Li, Xian-Dong,Yu, Zuo-Dong,Chen, Wei-Peng,&Gong, Chang-De.(2022).Topological superconductivity in Janus monolayer transition metal dichalcogenides.Chinese Physics B,31(11).

Li, Xian-Dong,et al."Topological superconductivity in Janus monolayer transition metal dichalcogenides".Chinese Physics B 31.11(2022).