First-principles study of spin texture and Fermi lines in Bi(111) multi-layer nanofilm

Abstract

We have performed a fully relativistic first-principles density functional calculation examining the surface state of bismuth (Bi) (111) multi-layer nanofilm, with up to 20 Bi bilayers, and investigated the Rashba effect and spin texture on the Bi surfaces. We have revealed a giant out-of-plane spin states on the Fermi lines, and the maximum value of the out-of-plane spin component being approximately 40% of the magnitude of the total spin. We have also evaluated the Rashba parameter ${\alpha }_R\simeq 1.9\mathrm{eV}\cdot$Åusing the surface state bands which is buried in the bulk state, at -0.32 eV below the Fermi energy.

Main Text (4 pages, 4 figures) and Supplemental Materials (2 pages, 3 figures)

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