Weyl Semimetal in the Strong Coulomb Interaction Limit

Akihiko Sekine, Kentaro Nomura

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

We study the effects of strong 1/r long-range Coulomb interactions in a Weyl semimetal. We consider a threedimensional (3D) Dirac fermion system on a lattice with a time-reversal symmetry breaking term, and take into account 1/r long-range Coulomb interactions between the bulk electrons. This model is regarded as the case where magnetic impurities are doped into the bulk of a 3D topological insulator. With the use of the strong coupling expansion of the lattice gauge theory and the mean-field approximation, we analyze the system from the strong coupling limit. It is shown that parity symmetry of the system is spontaneously broken in the strong coupling limit, and a different type of the Weyl semimetal, in which time-reversal and parity symmetries are broken, appears in the strong coupling limit. A possible global phase diagram of a correlated Weyl semimetal is presented.

Original languageEnglish
Article number094710
Journaljournal of the physical society of japan
Volume83
Issue number9
DOIs
Publication statusPublished - 2014 Sep 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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