Coexistence of Intrinsic Superconductivity and Topological Insulator State in Monoclinic Phase WS2

Abstract

Recently, intriguing phenomena of superconductivity, type-II Weyl semimetal or quantum spin Hall states were discovered in metastable 1T'-type VIB-group transition metal dichalcogenides (TMDs). Here, we report that monoclinic phase WS2 was discovered and synthesized in our experiments. The intrinsic superconducting transition was observed in monoclinic WS2 with a transition temperature Tc of 8.8 K which is the highest among previously reported TMDs without any fine-tuning process. Intersteing, topological insulator state, defined by topological invariant Z2, was also discovered with a single Dirac cone on the surface, which is different from all topological states reported in TMDs. Further, the electronic structure was found to have a strong anisotropy by Shubnikov-de Haas oscillations and first-principles calculations. Our findings reveal that monoclinic WS2 might be a new topological superconductivity candidate with a strong anisotropy.

20 pages, 5 figures, 1 table

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• Strong-Coupling Superconductivity with $T_c$ $\sim$ 10.8 K Induced by P Doping in the Topological Semimetal Mo${}_5$Si${}_3$
• Observation of the topological Dirac fermions and surface states in superconducting BaSn3
• Superconductivity in the nodal-line compound La${}_3$Pt${}_3$Bi${}_4$
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• Nonlinear Hall Effect in Antiferromagnetic Half-Heusler Materials
• Anomalously high supercurrent density in a two-dimensional topological material
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