Spin and Charge Shot Noise in Mesoscopic Spin Hall Systems

Details Spin and Charge Shot Noise in Mesoscopic Spin Hall Systems Spin and Charge Shot Noise in Mesoscopic Spin Hall Systems

2008-04-14

arxiv.org/abs/0804.2076v1

Europhys. Lett. 84, 37004 (2008).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 2 figures (5 embedded EPS files)

Scientific paper

10.1209/0295-5075/84/37004

Injection of unpolarized charge current through the longitudinal leads of a four-terminal two-dimensional electron gas with the Rashba spin-orbit (SO) coupling and/or SO scattering off extrinsic impurities is responsible not only for the pure spin Hall current in the transverse leads, but also for random time-dependent current fluctuations. We employ the scattering approach to current-current correlations in multiterminal nanoscale conductors to analyze the shot noise of transverse pure spin Hall and zero charge current, or transverse spin current and non-zero charge Hall current, driven by unpolarized or spin-polarized longitudinal current, respectively. Since any spin-flip acts as an additional source of noise, we argue that these shot noises offer a unique tool to differentiate between intrinsic and extrinsic SO mechanisms underlying the spin Hall effect in paramagnetic devices.

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