Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-07-24
Phys. Rev. B 76, 121301(R) (2007)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 4 figures
Scientific paper
10.1103/PhysRevB.76.121301
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 E_{F}, we show that the ISHA pattern is nearly isotropic (free-electron-like) only when E_{F} is close to the band bottom, and is sensitive/insensitive to E_{F} for the low/high bias regime with such E_{F}. With E_{F} far from the band bottom, band structure effects thus enter the ISHA patterns and the transport direction becomes significant.
Bihlmayer Gustav
Blügel Stefan
Chang Ching-Ray
Liu Ming-Hao
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