Observation of Topological Superconductivity in a Stoichiometric Transition Metal Dichalcogenide 2M-WS2

Abstract

Topological superconductors (TSCs) are unconventional superconductors with bulk superconducting gap and in-gap Majorana states on the boundary that may be used as topological qubits for quantum computation. Despite their importance in both fundamental research and applications, natural TSCs are very rare. Here, combining state of the art synchrotron and laser-based angle-resolved photoemission spectroscopy, we investigated a stoichiometric transition metal dichalcogenide (TMD), 2M-WS2 with a superconducting transition temperature of 8.8 K (the highest among all TMDs in the natural form up to date) and observed distinctive topological surface states (TSSs). Furthermore, in the superconducting state, we found that the TSSs acquired a nodeless superconducting gap with similar magnitude as that of the bulk states. These discoveries not only evidence 2M-WS2 as an intrinsic TSC without the need of sensitive composition tuning or sophisticated heterostructures fabrication, but also provide an ideal platform for device applications thanks to its van der Waals layered structure.

arXiv commentAccepted by Nature Communications

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• Direct observation of topological surface state in the topological superconductor 2M-WS2
• Realizing Topological Superconductivity in Tunable Bose-Fermi Mixtures with Transition Metal Dichalcogenide Heterostructures
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• Chemical Principles of Intrinsic Topological Superconductors
• Strong-Coupling Superconductivity with $T_c$ $\sim$ 10.8 K Induced by P Doping in the Topological Semimetal Mo${}_5$Si${}_3$
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• Crossover from Conventional to Unconventional Superconductivity in 2M-WS2
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• Identifying Majorana vortex modes via non-local transport
• Nonlinear optical responses in multi-orbital topological superconductors
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• Direct evidence for two-gap superconductivity in hydrogen-intercalated titanium diselenide