Monday, June 24, 2013

1306.5125 (R. I. Shekhter et al.)

Mechanically-controlled Rashba spin-splitters    [PDF]

R. I. Shekhter, O. Entin-Wohlman, A. Aharony
Suspended nanowires are shown to provide mechanically-controlled coherent mixing/splitting of the spin states of transmitted electrons caused by the Rashba spin-orbit interaction. The sensitivity of the latter to mechanical bending makes the wire a tunable nano-electro-mechanical (NEM) weak link between reservoirs. When the reservoirs are populated with misbalanced "spin up/down" electrons, the wire becomes a source of split spin currents, which are not associated with electric charge transfer and which do not depend on temperature or driving voltages. The mechanical vibrations of the bended wire allow for additional tunability of these splitters by applying a magnetic field and varying the temperature. For a micrometer InGaAs wire, the generated spin conductance is of the same order as the charge conductance (divided by $e^2$) which would arise due to electric driving voltages.
View original: http://arxiv.org/abs/1306.5125

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