Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 35: Spin controlled transport II
HL 35.13: Vortrag
Mittwoch, 27. Februar 2008, 17:30–17:45, ER 164
Spin Coulomb drag in a quasi-two-dimensional electron system beyond RPA — •Samvel Badalyan1,2, Chang Sub Kim3, and Giovanni Vignale4 — 1Department of Radiophysics, Yerevan State University, 375025 Yerevan, Armenia — 2Department of Physics, University of Regensburg, 93040 Regensburg, Germany — 3Department of Physics, Chonnam National University, 500-757 Gwangju, Korea — 4Department of Physics and Astronomy, University of Missouri - Columbia, Missouri 65211, USA
We study the spin Coulomb drag in a quasi-two-dimensional electron gas of finite transverse width, including local field corrections beyond the random phase approximation (RPA). We find that the finite transverse width of the electron gas causes a significant reduction of the spin Coulomb drag. This reduction, however, is largely compensated by the enhancement coming from the inclusion of many-body local field effects beyond the RPA. Our calculations are in very good agreement with the experimental observations of the spin Coulomb drag by C. P. Weber et al., Nature, 437, 1330 (2005).
This work is supported by the Volkswagen Foundation, the DFG Grant Sonderforschungsbereich 689, and NSF Grant No. DMR-0313681.