Crossover from Conventional to Unconventional Superconductivity in 2M-WS2
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arXiv
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| Autori principali: | , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866912149511602176 |
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| author | Samarawickrama, Piumi McBride, Joseph Gautam, Sabin Fu, ZhuangEn Watanabe, Kenji Taniguchi, Takashi Wang, Wenyong Tang, Jinke Ackerman, John Leonard, Brian M. Tian, Jifa |
| author_facet | Samarawickrama, Piumi McBride, Joseph Gautam, Sabin Fu, ZhuangEn Watanabe, Kenji Taniguchi, Takashi Wang, Wenyong Tang, Jinke Ackerman, John Leonard, Brian M. Tian, Jifa |
| contents | Leveraging 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_06612 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Crossover from Conventional to Unconventional Superconductivity in 2M-WS2 Samarawickrama, Piumi McBride, Joseph Gautam, Sabin Fu, ZhuangEn Watanabe, Kenji Taniguchi, Takashi Wang, Wenyong Tang, Jinke Ackerman, John Leonard, Brian M. Tian, Jifa Mesoscale and Nanoscale Physics Superconductivity Leveraging 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. |
| title | Crossover from Conventional to Unconventional Superconductivity in 2M-WS2 |
| topic | Mesoscale and Nanoscale Physics Superconductivity |
| url | https://arxiv.org/abs/2412.06612 |