Evidence of Nodal Superconductivity in Monolayer 1H-TaS2 with Hidden Order Fluctuations

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Abstract

Unconventional superconductors represent one of the fundamental directions in modern quantum materials research. In particular, nodal superconductors are known to appear naturally in strongly correlated systems, including cuprate superconductors and heavy-fermion systems. Van der Waals materials hosting superconducting states are well known, yet nodal monolayer van der Waals superconductors have remained elusive. Here, using low-temperature scanning tunneling microscopy (STM) and spectroscopy (STS) experiments, it is shown that pristine monolayer 1H-TaS2 realizes a nodal superconducting state. Non-magnetic disorder drives the nodal superconducting state to a conventional gapped s-wave state. Furthermore, many-body excitations emerge close to the gap edge, signalling a potential unconventional pairing mechanism. The results demonstrate the emergence of nodal superconductivity in a van der Waals monolayer, providing a building block for van der Waals heterostructures exploiting unconventional superconducting states.

Original languageEnglish
Article number2305409
JournalAdvanced Materials
Volume35
Issue number45
Early online date2023
DOIs
Publication statusPublished - 9 Nov 2023
MoE publication typeA1 Journal article-refereed

Keywords

  • monolayer transition metal dichalcogenide
  • nodal superconductivity
  • scanning tunneling microscopy (STM)
  • scanning tunneling spectroscopy
  • unconventional superconductivity
  • van der Waals materials

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