Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-10-20
V.V. Shlyapin, A.G. Mal'shukov, Phys. Rev. B 82 (2010) 115329
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
16 pages, 6 figures
Scientific paper
10.1103/PhysRevB.82.115329
The Aharonov-Casher (AC) oscillations of spin current through a 2D ballistic ring in the presence of Rashba spin-orbit interaction and external magnetic field has been calculated using the semiclassical path integral method. For classically chaotic trajectories the Fokker-Planck equation determining dynamics of the particle spin polarization has been derived. On the basis of this equation an analytic expression for the spin conductance has been obtained taking into account a finite width of the ring arms carrying large number of conducting channels. It was shown that the finite width results in a broadening and damping of spin current AC oscillations. We found that an external magnetic field leads to appearance of new nondiagonal components of the spin conductance, allowing thus by applying a rather weak magnetic field to change a direction of the transmitted spin current polarization.
Mal'shukov Anatoly G.
Shlyapin V. V.
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