Gauge freedom for degenerate Bloch states

F. Pientka*, M. Gradhand, D. V. Fedorov, I. Mertig, B. L. Gyoerffy

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

10 Citations (Scopus)

Abstract

In nonmagnetic crystals with inversion symmetry the electronic bands are twofold degenerate. As a consequence, any orthonormalized linear combination of the two corresponding eigenfunctions can represent the electron wave function. A priori it is not obvious which superposition, gauge, should be chosen to calculate a quantity which is not gauge invariant within a certain approximation. Here we consider gauge options appropriate under particular physical conditions.

Original languageEnglish
Article number054413
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume86
DOIs
Publication statusPublished - 2012

Keywords

  • SYSTEMS
  • CRYSTALS
  • BERRY-PHASE
  • ELECTRONS
  • WAVE-PACKET DYNAMICS

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