Dispersion of Fermi arcs in Weyl semimetals and their evolutions to Dirac cones

Ryo Okugawa, Shuichi Murakami

Research output: Contribution to journalArticle

76 Citations (Scopus)

Abstract

We study dispersions of Fermi arcs in the Weyl semimetal phase by constructing an effective model. We calculate how the surface Fermi-arc dispersions for the top and bottom surfaces merge into the bulk Dirac cones in the Weyl semimetal at both ends of the arcs, and show that they have opposite velocities. This result is common to general Weyl semimetals, and is also confirmed by a calculation using a tight-binding model. Furthermore, by changing a parameter in the system while preserving time-reversal symmetry, we show that two Fermi arcs evolve into a surface Dirac cone when the system transits from the Weyl semimetal to the topological insulator phase. We also demonstrate that choices of surface terminations affect the pairing of Weyl nodes, from which the Fermi arcs are formed.

Original languageEnglish
Article number235315
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number23
DOIs
Publication statusPublished - 2014 Jun 20
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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