Higher-order contributions to the Rashba-Bychkov effect with application to the Bi/Ag(111) surface alloy

Sz Vajna, E. Simon, A. Szilva, K. Palotas, B. Ujfalussy, L. Szunyogh

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

In order to explain the anisotropic Rashba-Bychkov effect observed in several metallic-surface-state systems, we use k•p perturbation theory with a simple group-theoretical analysis and construct effective Rashba Hamiltonians for different point groups up to third order in the wave number. We perform relativistic ab initio calculations for the (√3×√3)R30 Bi/Ag(111) surface alloy, and from the calculated splitting of the band dispersion we find evidence of the predicted third-order terms. Furthermore, we derive expressions for the corresponding third-order Rashba parameters to provide a simple explanation of the qualitative difference concerning the Rashba-Bychkov splitting of the surface states at Au(111) and Bi/Ag(111).

Original languageEnglish
Article number075404
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number7
DOIs
Publication statusPublished - Feb 6 2012

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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