Superconductivity in type II layered Weyl semi-metals

B. Rosenstein, B. Ya Shapiro*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Novel ‘quasi 2D’ typically layered (semi)metals offer a unique opportunity to control the density and even the topology of electronic matter. In intercalated MoTe 2 type II Weyl semi-metal the tilt of the dispersion relation cones is so large that topologically the Fermi surface is distinct from a more conventional type I. Superconductivity observed recently in this compound (Zhang et al 2022 2D Mater. 9 045027) demonstrated two puzzling phenomena. The gate voltage has no impact on critical temperature, T c , in a wide range of density, while it is very sensitive to the inter-layer distance. A phonon theory of pairing in a layered Weyl material including the effects of Coulomb repulsion is constructed, which explains the above two features in MoTe 2. The first feature turns out to be a general one for any type II topological material, while the second reflects properties of the intercalated materials affecting the Coulomb screening.

Original languageEnglish
Article number035021
Journal2D Materials
Volume10
Issue number3
DOIs
StatePublished - Jul 2023

Keywords

  • superconductivity theory
  • topological type II
  • Weyl semi-metal

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