Please use this identifier to cite or link to this item: https://doi.org/11/115206
Title: Spin polarization of tunneling current in barriers with spin-orbit coupling
Authors: Fujita, T. 
Jalil, M.B.A. 
Tan, S.G. 
Issue Date: 19-Mar-2008
Source: Fujita, T.,Jalil, M.B.A.,Tan, S.G. (2008-03-19). Spin polarization of tunneling current in barriers with spin-orbit coupling. Journal of Physics Condensed Matter 20 (11) : -. ScholarBank@NUS Repository. https://doi.org/11/115206
Abstract: We present a general method for evaluating the maximum transmitted spin polarization and optimal spin axis for an arbitrary spin-orbit coupling (SOC) barrier system, in which the spins lie in the azimuthal plane and finite spin polarization is achieved by wavevector filtering of electrons. Besides momentum filtering, another prerequisite for finite spin polarization is asymmetric occupation or transmission probabilities of the eigenstates of the SOC Hamiltonian. This is achieved most efficiently by resonant tunneling through multiple SOC barriers. We apply our analysis to common SOC mechanisms in semiconductors: pure bulk Dresselhaus SOC, heterostructures with mixed Dresselhaus and Rashba SOC and strain-induced SOC. In particular, we find that the interplay between Dresselhaus and Rashba SOC effects can yield several advantageous features for spin filter and spin injector functions, such as increased robustness to wavevector spread of electrons. © IOP Publishing Ltd.
Source Title: Journal of Physics Condensed Matter
URI: http://scholarbank.nus.edu.sg/handle/10635/51041
ISSN: 09538984
DOI: 11/115206
Appears in Collections:Staff Publications

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