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- W2078007145 abstract "We study the effect of Rashba spin-orbit coupling on the spin interference in a non-interacting one-dimensional ring connected to two lead theoretically within the non-equilibrium Greens' function formalism. We compute the charge and spin currents and analyze their Aharonov-Bohm oscillations. The geometry of the system is conveniently described by the angle ¿ between the two leads. We show that for ¿=180° (i.e for symmetrically coupled leads) a good filtering of up or down spin orientation is obtained around half-integer multiples of ¿/¿ <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>0</sub> . These particular flux values correspond to degeneracy points for clockwise and counter-clockwise propagating state related to the same spin orientation in the local spin frame of the ring. In contrast, for the asymmetric coupling, i.e., ¿=135° the filter efficiency is maximum around integer multiples of ¿/¿ <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>0</sub> . The numerical results suggest that the spin filtering is obtained when the clockwise or counter-clockwise states interfere destructively. The spin filtering regime is stable against variations of the bias applied on the system." @default.
- W2078007145 created "2016-06-24" @default.
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- W2078007145 date "2010-01-01" @default.
- W2078007145 modified "2023-09-25" @default.
- W2078007145 title "Spin filtering in a quantum ring with Rashba coupling" @default.
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- W2078007145 doi "https://doi.org/10.1109/inec.2010.5425177" @default.
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