Journal
PHYSICAL REVIEW B
Volume 85, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.075404
Keywords
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Funding
- Hungarian Research Foundation [OTKA K77771, OTKA K84078, OTKA PD83353]
- New Szechenyi Plan of Hungary [TAMOP-4.2.1/B-09/1/KMR-2010-0002]
- Bolyai Grant
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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 (root 3 x root 3)R30 degrees 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).
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