Mesoscopic fluctuations of spin currents

Details Mesoscopic fluctuations of spin currents Mesoscopic fluctuations of spin currents

2007-06-24

arxiv.org/abs/0706.3529v1

New Journal of Physics 9 (2007) 352

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, submitted to New J.P

Scientific paper

10.1088/1367-2630/9/9/352

Spin currents may be generated by applying bias voltages V to the nanostructures even in the absence of spin-active ferromagnetic interfaces. Most theoretical proposals concentrate on a concrete spin-orbit interaction and on the disorder-averaged effect. It remains underappreciated that any spin-orbit interaction produces random spin currents with a typical amplitude e^2 V/\hbar not affected by disorder. This work addresses such mesoscopic fluctuations of spin currents for generic model of a nanostructure where several quantum connectors meet in a single node. The analysis is performed in the framework of recently developed quantum circuit theory of G_Q corrections and reveals four distinct mechanisms of spin current fluctuations. The results are elaborated for simple models of tunnel and ballistic connectors.

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