Intrinsic spin-Hall accumulation in honeycomb lattices: Band structure effects

Ming Hao Liu, Gustav Bihlmayer, Stefan Blügel, Ching Ray Chang

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Local spin and charge densities on a two-dimensional honeycomb lattice are calculated by the Landauer-Keldysh formalism (LKF). Through the empirical tight-binding method, we show how the realistic band structure can be brought into the LKF. Taking the Bi(111) surface, on which strong surface states and Rashba spin-orbit coupling are present, as a numeric example, we show typical intrinsic spin-Hall accumulation (ISHA) patterns thereon. The Fermi-energy-dependence of the spin and charge transport in two-terminal nanostructure samples is subsequently analyzed. By changing EF, we show that the ISHA pattern is nearly isotropic (free-electron-like) only when EF is close to the band bottom, and is sensitive/insensitive to EF for the low/high bias regime with such EF. With EF far from the band bottom, band structure effects thus enter the ISHA patterns and the transport direction becomes significant.

Original languageEnglish
Article number121301
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number12
DOIs
Publication statusPublished - 2007 Sep 14

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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