Berlin 2015 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 13: Electronic Structure of Surfaces II
O 13.8: Vortrag
Montag, 16. März 2015, 17:00–17:15, MA 041
Spin-orbit interaction and Dirac cones in d orbital noble metal surface states — •Ryan Requist1, Polina M. Sheverdyaeva2, Paolo Moras2, Sanjoy K. Mahatha3, Carlo Carbone2, and Erio Tosatti1,3,4 — 1International School for Advanced Studies,Trieste, Italy — 2Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Trieste, Italy — 3International Centre for Theoretical Physics, Trieste, Italy — 4IOM-CNR – Democritos, Trieste, Italy
We report a joint photoemission/ab initio study of spin-orbit effects in the deep d orbital surface states of a 24-layer Au film grown on Ag(111) and a 24-layer Ag film grown on Au(111), singling out a conical intersection (Dirac cone) in a large surface-projected gap at the time-reversal symmetric M points. Unlike the often isotropic dispersion at Γ point Dirac cones, the M point cones are strongly anisotropic. An effective k·p is derived to describe the anisotropic Rashba band splitting and spin polarization near the Dirac cone, and we discuss multiband tight binding models for surface states with spin-orbit interactions.