Semimetal with both Rarita-Schwinger-Weyl and Weyl excitations

Long Liang*, Yue Yu

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

23 Citations (Scopus)
192 Downloads (Pure)

Abstract

A relativistic spinor with spin 3/2 is historically called a Rarita-Schwinger spinor. The right-and left-handed chiral degrees of freedom for the massless Rarita-Schwinger spinor are independent and are thought of as the left and right Weyl fermions with helicity +/- 3/2. We study three orbital spin-1/2 Weyl semimetals in the strong spin-orbital coupling limit with time reversal symmetry breaking. We find that in this limit the systems can be a J(eff) = 1/2 Weyl semimetal or a J(eff) = 3/2 semimetal, depending on the Fermi level position. The latter near Weyl points includes degrees of freedom of both Rarita-Schwinger-Weyl and Weyl. A nonlocal potential separates the Weyl and Rarita-Schwinger-Weyl degrees of freedom, and a relativistic Rarita-Schwinger-Weyl semimetal emerges. This recipe can be generalized to a mulit-Weyl semimetal and Weyl fermions with pairing interaction to obtain high monopole charges. Similarly, a spatial-inversion-breaking Raita-Schwinger-Weyl semimetal may also emerge.

Original languageEnglish
Article number045113
Pages (from-to)1-6
Number of pages6
JournalPhysical Review B
Volume93
Issue number4
DOIs
Publication statusPublished - 12 Jan 2016
MoE publication typeA1 Journal article-refereed

Keywords

  • TOPOLOGICAL DIRAC SEMIMETAL
  • SPIN
  • QUANTIZATION
  • INSULATORS
  • PARTICLES
  • MOBILITY
  • PHASE

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