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<p>Understanding the emergence of unconventional superconductivity, where the order parameter deviates from simple isotropic s-wave pairing, is a central challenge in condensed matter physics. Some transition-metal dichalcogenides (TMDCs), though generally regarded as conventional superconductors, display signatures of unconventional pairing and thus provide a particularly intriguing platform to explore how exotic states arise. Here we investigate the misfit compound (SnS)<sub>1.15</sub>(TaS<sub>2</sub>), a heterostructure composed of alternating SnS and 1H-TaS<sub>2</sub> layers. Using transport, photoemission, and scanning tunneling spectroscopy, we demonstrate that the SnS layers effectively decouple the TaS<sub>2</sub> into electronically isolated 1H sheets. In this limit, the tunneling density of states on the 1H layer reveals a clear two-gap superconducting spectrum with <i>T</i><sub><i>c</i></sub><i>≃</i>3.1 K. A theoretical model based on lack of inversion symmetry of the system and finite-range attraction reproduces the observed multi-gap structure as a mixed singlet-triplet state. These results establish misfit compounds as a powerful platform for studying unconventional superconductivity in isolated 1H layers and for realizing multiple uncoupled superconductors within a single crystal.</p>

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Mixed triplet-singlet order parameter in decoupled superconducting 1H monolayers of transition-metal dichalcogenides

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月16日

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  • Avior Almoalem,
  • Sajilesh K. P.,
  • Roni Anna Gofman,
  • Yuval Nitzav,
  • Ilay Mangel,
  • Nitzan Ragoler,
  • Jun Fujii,
  • Ivana Vobornik,
  • Francois Bertran,
  • Amit Kanigel,
  • Jonathan Ruhman,
  • Vidya Madhavan

摘要

Understanding the emergence of unconventional superconductivity, where the order parameter deviates from simple isotropic s-wave pairing, is a central challenge in condensed matter physics. Some transition-metal dichalcogenides (TMDCs), though generally regarded as conventional superconductors, display signatures of unconventional pairing and thus provide a particularly intriguing platform to explore how exotic states arise. Here we investigate the misfit compound (SnS)1.15(TaS2), a heterostructure composed of alternating SnS and 1H-TaS2 layers. Using transport, photoemission, and scanning tunneling spectroscopy, we demonstrate that the SnS layers effectively decouple the TaS2 into electronically isolated 1H sheets. In this limit, the tunneling density of states on the 1H layer reveals a clear two-gap superconducting spectrum with Tc≃3.1 K. A theoretical model based on lack of inversion symmetry of the system and finite-range attraction reproduces the observed multi-gap structure as a mixed singlet-triplet state. These results establish misfit compounds as a powerful platform for studying unconventional superconductivity in isolated 1H layers and for realizing multiple uncoupled superconductors within a single crystal.