Effect of the type-I to type-II Weyl semimetal topological transition on superconductivity

Dingping Li, Baruch Rosenstein, B. Ya Shapiro, I. Shapiro

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46 Scopus citations

Abstract

The influence of recently discovered topological transition between type-I and type-II Weyl semimetals on superconductivity is considered. A set of Gorkov equations for weak superconductivity in Weyl semimetal under topological phase transition is derived and solved. The critical temperature and superconducting gap both have spikes in the transition point as functions of the tilt parameter of the Dirac cone determined, in turn, by the material parameters like pressure. The spectrum of superconducting excitations is different in two phases: The sharp cone pinnacle is characteristic for type I, while two parallel almost flat bands, are formed in type II. Spectral density is calculated on both sides of transition to demonstrate the different weights of the bands. The superconductivity thus can be used as a clear indicator for the topological transformation. Results are discussed in the light of recent experiments.

Original languageEnglish
Article number094513
JournalPhysical Review B
Volume95
Issue number9
DOIs
StatePublished - 21 Mar 2017

Bibliographical note

Publisher Copyright:
© 2017 American Physical Society.

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