2007/07/31 by Ming‐Hao Liu, Ming-Hao Liu, Gustav Bihlmayer +3 · 1 citation
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Topological Materials and Phenomena #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.76.121301
published as Phys. Rev. B 76, 121301(R) (2007) · 4 pages, 4 figures
openalex publication_date 2007/09/05 · arxiv created 2007/09/08 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 [Phys. Rev. Lett. 93, 046403 (2004)], 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.