Article

 

Instabilities of Weyl loop semimetals 公开 Deposited

https://scholar.colorado.edu/concern/articles/jh343s983
Abstract
  • We study Weyl-loop semi-metals with short range interactions, focusing on the possible interaction driven instabilities. We introduce an expansion regularization scheme by means of which the possible instabilities may be investigated in an unbiased manner through a controlled weak coupling renormalization group (RG) calculation. The problem has enough structure that a 'functional' RG calculation (necessary for an extended Fermi surface) can be carried out analytically. The leading instabilities are identified, and when there are competing degenerate instabilities a Landau–Ginzburg calculation is performed to determine the most likely phase. In the particle-particle channel, the leading instability is found to be to a fully gapped chiral superconducting phase which spontaneously breaks time reversal symmetry, in agreement with general symmetry arguments suggesting that Weyl loops should provide natural platforms for such exotic forms of superconductivity. In the particle hole channel, there are two potential instabilities—to a gapless Pomeranchuk phase which spontaneously breaks rotation symmetry, or to a fully gapped insulating phase which spontaneously breaks mirror symmetry. The dominant instability in the particle hole channel depends on the specific values of microscopic interaction parameters.

Creator
Date Issued
  • 2016-11-29
Academic Affiliation
Journal Title
Journal Issue/Number
  • 18
Journal Volume
  • Focus on Topological Semimetals
File Extent
  • 115006
Subject
最新修改
  • 2020-01-08
Resource Type
权利声明
DOI
ISSN
  • 1367-2630
Language

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