biostudies-literatureGan QNanjing University International Research Seed FundScience and Technology Commission of Shanghai MunicipalityJSPS KAKENHIHefei National Research Center for Physical Sciences at the MicroscaleNational Key Projects for Research and Development of ChinaBasic and Applied Basic Research Foundation of Guangdong ProvinceShanghai Rising-Star ProgramNational Key Research and Development Program of ChinaNational Nature Science Foundation of ChinaNatural Science Foundation of Jiangsu Provincee08242https://www.ebi.ac.uk/biostudies/studies/S-EPMC12786309biostudies-literatureUnknown13(2)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), dAdvanced science (Weinheim, Baden-Wurttemberg, Germany)Electrical Step-Edge Contact to a Topological Superconductor Candidate 2M-WS<sub>2</sub>.PMC127863091227429821H0523323DZ12008002021YFA12029022022B15151200202022YFA1604400/03BK20220066KF20210039236520423QA14107002021YFA140040023H020522022YFA120470012525403BK20233001Huang FZhu YGuo YRhodes DAGao HTaniguchi TSong JAn DZhang QWang LFang YLi XLi YLiu ZGan QHe YXian LGuo HGu LWatanabe KfalseElectrical Step-Edge Contact to a Topological Superconductor Candidate 2M-WS<sub>2</sub>.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), d2026-01-01T00:00:00Z2026 Jan2026-06-06T12:30:28.037Z2026-05-30T03:11:34.114ZS-EPMC127863094123734610.1002/advs.202508242