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Semiclassical theory of spin-orbit torques in disordered multiband electron systems | | Cong Xiao
; Qian Niu
; | | Date: |
22 May 2017 | | Abstract: | We study spin-orbit torques (SOT) in non-degenerate multiband electron
systems in the weak disorder limit. Using the two-dimensional Rashba
ferromagnet as a model system, we show that the antidamping-like SOT arising
from disorder-induced interband-coherence effects is very sensitive to the spin
structure of disorder and may have the same sign as the intrinsic SOT in the
presence of spin-dependent disorder. While the cancellation of this SOT and the
intrinsic one occurs only in the case of spin-independent short-range disorder.
In order to have better physical transparency a semiclassical Boltzmann
approach equivalent to the Kubo diagrammatic approach in the non- crossing
approximation is formulated. This semiclassical framework accounts for the
interband- coherence effects induced by both the electric field and static
impurity scattering. | | Source: | arXiv, 1705.7947 | | Services: | Forum | Review | PDF | Favorites | |
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