Issue |
EPL
Volume 84, Number 3, November 2008
|
|
---|---|---|
Article Number | 37004 | |
Number of page(s) | 6 | |
Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
DOI | https://doi.org/10.1209/0295-5075/84/37004 | |
Published online | 21 October 2008 |
Spin and charge shot noise in mesoscopic spin Hall systems
1
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
Received:
30
June
2008
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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