Electrical Step-Edge Contact to a Topological Superconductor Candidate 2M-WS₂.

ABSTRACT: A topological superconductor (TSC), characterized by a topologically nontrivial bulk state and protected gapless boundary states, is a promising platform for hosting Majorana bound states. However, many TSCs are environmentally sensitive, especially when thinned to 2D atomic layers. This instability poses a major challenge for integrating TSCs into electronic devices. Addressing it requires full encapsulation and high-quality electrical contact to the TSC layer, which have not yet been achieved. Here, a novel contact geometry is demonstrated for an encapsulated topological superconductor candidate, 2M-WS₂, where metal electrodes contact the exposed step-like edges with a width of only a few nanometers. This structure yields exceptionally low contact resistance (R_C), d

SUBMITTER: Gan Q 

PROVIDER: S-EPMC12786309 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature