Observation of the critical state to multiple-type Dirac semimetal phases in KMgBi
Journal of Applied Physics AIP Publishing 129:23 (2021) 235109
Electronic structure of a thermoelectric material: BiCuSO
Physical Review B American Physical Society (APS) 103:24 (2021) 245121
Evidence of a topological edge state in a superconducting nonsymmorphic nodal-line semimetal
Physical Review B American Physical Society (APS) 103:20 (2021) l201109
Observation of topological superconductivity in a stoichiometric transition metal dichalcogenide 2M-WS2.
Nature communications 12:1 (2021) 2874
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.Observation of topological Dirac fermions and surface states in superconducting BaSn3
Physical Review B American Physical Society (APS) 103:15 (2021) 155148