Volume 84, Number 3, November 2008
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||21 October 2008|
Spin and charge shot noise in mesoscopic spin Hall systems
Department of Physics and Astronomy, University of Delaware - Newark, DE 19716-2570, USA
2 Department of Physics, Texas A&M University - College Station, TX 77843-4242, USA
Accepted: 22 September 2008
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 SO scattering off extrinsic impurities is responsible not only for the pure spin Hall current in the transverse leads, but also for non-equilibrium 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 current and zero charge current, or transverse spin current and non-zero charge Hall current, driven by unpolarized or spin-polarized injected longitudinal charge current, respectively. Since any spin-flip acts as an additional source of noise, we argue that these shot noises provide a unique experimental tool to differentiate between intrinsic and extrinsic SO mechanisms underlying the spin Hall effect in paramagnetic devices.
PACS: 72.25.Dc – Spin polarized transport in semiconductors / 05.40.Ca – Noise
© EPLA, 2008
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