Effect of sublattice asymmetry and spin-orbit interaction on out-of-plane spin polarization of photoelectrons

P. Rakyta, A. Kormányos, J. Cserti

Research output: Article

13 Citations (Scopus)

Abstract

We study theoretically the effect of spin-orbit coupling and sublattice asymmetry in graphene on the spin polarization of photoelectrons. We show that sublattice asymmetry in graphene not only opens a gap in the band structure, but in the case of finite spin-orbit interaction it also gives rise to an out-of-plane spin polarization of electrons close to the Dirac point of the Brillouin zone. This can be detected by measuring the spin polarization of photoelectrons, and therefore spin-resolved photoemission spectroscopy can reveal the presence of a band gap even if it is too small to be observed directly by angle-resolved photoemission spectroscopy because of the finite resolution of measurements or because the sample is p-doped. We present analytical and numerical calculations on the energy and linewidth dependence of photoelectron intensity distribution and spin polarization.

Original languageEnglish
Article number155439
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number15
DOIs
Publication statusPublished - ápr. 25 2011

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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