Affiliation:
1. Department of Applied Physics Aalto University FI‐00076 Aalto Finland
2. Institute of Functional Nano and Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon‐Based Functional Materials and Devices Soochow University Suzhou Jiangsu 215123 P. R. China
3. Department of Microtechnology and Nanoscience Chalmers University of Technology Gothenburg 41296 Sweden
4. Department of Physics Department of Chemistry and Nanoscience Center University of Jyväskylä University of Jyväskylä FI‐40014 Finland
Abstract
AbstractUnconventional 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.
Funder
H2020 European Research Council
Luonnontieteiden ja Tekniikan Tutkimuksen Toimikunta
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
7 articles.
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