Nonlocal Charge Transport Mediated by Spin Diffusion in the Spin-Hall Effect Regime

Details Nonlocal Charge Transport Mediated by Spin Diffusion in the Spin-Hall Effect Regime Nonlocal Charge Transport Mediated by Spin Diffusion in the Spin-Hall Effect Regime

2007-08-03

arxiv.org/abs/0708.0455v1

Phys. Rev. B 79, 035304 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures

Scientific paper

A nonlocal electric response in the spin-Hall regime, resulting from spin diffusion mediating charge conduction, is predicted. The spin-mediated transport stands out due to its long-range character, and can give dominant contribution to nonlocal resistance. The characteristic range of nonlocality, set by the spin diffusion length, can be large enough to allow detection of this effect in materials such as GaAs despite its small magnitude. The detection is facilitated by a characteristic nonmonotonic dependence of transresistance on the external magnetic field, exhibiting sign changes and decay.

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