Regensburg 2010 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 26: Spin-controlled Transport II
HL 26.6: Vortrag
Dienstag, 23. März 2010, 15:30–15:45, H14
SU(2) symmetry and the Boltzmann equation for the Rashba model — •Cosimo Gorini1, Peter Schwab1, and Roberto Raimondi2 — 1Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany — 2CNISM and Dipartimento di Fisica, Università Roma Tre, Via della Vasca Navale 84, 00146 Roma, Italy
Spin-orbit coupling in low-dimensional systems leads to rich physics, interesting from both the fundamental point of view and for applications. Spin-charge coupled dynamics allows to manipulate the spin degrees of freedom by purely electrical means.
The Boltzmmann equation is very useful for the theoretical description of transport properties. However in its standard formulation for the Rashba model the scattering kernel is cumbersome and the physical origin of the electric field induced spin currents is not transparent. We exploit the SU(2) gauge symmetry in the model which allows a symmetric treatment of spin and charge degrees of freedom.
We obtain a Boltzmann equation where the SU(2) magnetic field due to spin-orbit coupling appears explicitly. This generates the spin Hall currents, just as standard Hall currents are generated by the real magnetic field. We derive the coupled spin-charge diffusion equations.