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O: Fachverband Oberflächenphysik

O 35: Poster Solid-Liquid Interfaces: Structure

O 35.1: Poster

Dienstag, 18. März 2025, 13:30–15:30, P3

Comparision of spin and orbital Rashba effect in Bi_xPb_1−x/Ag(111) — •Himanshu Lohani — EP7 University of Wurzburg

Superstructure of heavy elements constructed on the surface of noble metals is one of the most celebrated system in the field of spintronics due to giant Rashba spin splitting found in its surface electronic structure. A new perspective of orbitronics has emerged recently for reinvestigating this system after the uprising of orbital based Rashba effect. Angle resolved photoelectron spectroscopy (ARPES) not only visualizes directly the electronic band dispersion but intensity of the photoemission signal itself carries important information of orbital character of the bands. By using the photoemission intensity calculation which is designed on a tight binding model, we successfully capture evolution of the Rashba surface state bands (SSBs) dispersion and intensity as they are observed in our ARPES data on Bi_xPb_1−x/Ag(111). This comparative study hints that buckling of Bi/Pb atoms on Ag(111) surface affects spin polarization of the Rashba SSBs more than their orbital polarization

Keywords: Rashba splitting; Orbitaal Rashba effect; Tight Binding model