Engineering Weyl nodes in Dirac semimetals by a magnetic field

E. V. Gorbar, V. A. Miransky, Igor Shovkovy

Research output: Contribution to journalArticle

47 Scopus citations

Abstract

We study the phase diagram of a Dirac semimetal in a magnetic field at a nonzero charge density. It is shown that there exists a critical value of the chemical potential at which a first-order phase transition takes place. At subcritical values of the chemical potential the ground state is a gapped state with a dynamically generated Dirac mass and a broken chiral symmetry. The supercritical phase is the normal (gapless) phase with a nontrivial chiral structure: it is a Weyl semimetal with a pair of Weyl nodes for each of the original Dirac points. The nodes are separated by a dynamically induced chiral shift. The direction of the chiral shift coincides with that of the magnetic field and its magnitude is determined by the quasiparticle charge density, the strength of the magnetic field, and the strength of the interaction. The rearrangement of the Fermi surface accompanying this phase transition is described.

Original languageEnglish (US)
Article number165105
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume88
Issue number16
DOIs
StatePublished - Oct 4 2013

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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