期刊
PHYSICAL REVIEW LETTERS
卷 119, 期 8, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.119.087003
关键词
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资金
- Austrian Science Fund (FWF) [J 3806-N36]
- Leverhulme Trust [RL-2012-001]
- UK Engineering and Physical Sciences Research Council [EP/J009857/1, EP/M020517/1]
- European Union's Horizon program [696656 GrapheneCore1]
- University of Oxford Advanced Research Computing (ARC) facility
- ARCHER UK National Supercomputing Service under the AMSEC Leadership project
- Austrian Science Fund (FWF) [J3806] Funding Source: Austrian Science Fund (FWF)
- Austrian Science Fund (FWF) [J 3806] Funding Source: researchfish
- Engineering and Physical Sciences Research Council [EP/M020517/1, EP/J009857/1] Funding Source: researchfish
- EPSRC [EP/M020517/1, EP/J009857/1] Funding Source: UKRI
We elucidate the origin of the phonon-mediated superconductivity in 2H-NbS2 using the ab initio anisotropic Migdal-Eliashberg theory including Coulomb interactions. We demonstrate that superconductivity is associated with Fermi surface hot spots exhibiting an unusually strong electron-phonon interaction. The electron-lattice coupling is dominated by low-energy anharmonic phonons, which place the system on the verge of a charge density wave instability. We also provide definitive evidence for two-gap superconductivity in 2H-NbS2, and show that the low-and high-energy peaks observed in tunneling spectra correspond to the Gamma- and K-centered Fermi surface pockets, respectively. The present findings call for further efforts to determine whether our proposed mechanism underpins superconductivity in the whole family of metallic transition metal dichalcogenides.
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