| Abstract |
Leveraging the reciprocal-space proximity effect between superconducting bulk and topological surface states (TSSs) offers a promising way to topological superconductivity. However, elucidating the mutual influence of bulk and TSSs on topological superconductivity remains a challenge. Here, we report pioneering transport evidence of a thickness-dependent transition from conventional to unconventional superconductivity in 2M-phase WS2 (2M-WS2). As the sample thickness reduces, we see clear changes in key superconducting metrics, including critical temperature, critical current, and carrier density. Notably, while thick 2M-WS2 samples show conventional superconductivity, with an in-plane (IP) upper critical field constrained by the Pauli limit, samples under 20 nm exhibit a pronounced IP critical field enhancement, inversely correlated with 2D carrier density. This marks a distinct crossover to unconventional superconductivity with strong spin-orbit-parity coupling. Our findings underscore the crucial role of sample thickness in accessing topological states in 2D topological superconductors, offering pivotal insights into future studies of topological superconductivity. |
| Authors |
Piumi Samarawickrama  , Joseph McBride , Sabin Gautam , Zhuangen Fu  , Kenji Watanabe , Takashi Taniguchi , Wenyong Wang , Jinke Tang , John Ackerman , Brian M. Leonard , Jifa Tian
|
| Journal Info |
American Chemical Society | Nano Letters
|
| Publication Date |
12/5/2024 |
| ISSN |
1530-6984 |
Type |
article |
| Open Access |
closed
|
| DOI |
https://doi.org/10.1021/acs.nanolett.4c05257 |
| Keywords |
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