Journal Article

PreJuSER-58086

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Intrinsic spin-Hall accumulation in honeycomb lattices: Band structure effects

Liu, M.-H.FZJ* ; Bihlmayer, G.FZJ* ; Blügel, S.FZJ* ; Chang, C.-R.

2007
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/7723  doi:10.1103/PhysRevB.76.121301

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 [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.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (IFF-1)
2. Center of Nanoelectronic Systems for Information Technology (CNI)
3. Jülich-Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT)
4. Jülich-Aachen Research Alliance - Simulation Sciences (JARA-SIM)

Research Program(s):

1. Grundlagen für zukünftige Informationstechnologien (P42)

Appears in the scientific report 2007

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