Spin-galvanic effect due to optical spin orientation
Ganichev, S. D. · Schneider, Petra · Bel'kov, V. V. · Ivchenko, E. L. · Tarasenko, S. A. · Wegscheider, W. · Weiss, D. · Schuh, D. · Murdin, B. N. · Phillips, P. J. · Pidgeon, C. R. · Clarke, D. G. · Merrick, M. · Murzyn, P. · Beregulin, E. V. · Prettl, W.
Original · EN
Under oblique incidence of circularly polarized infrared radiation the spin-galvanic effect has been unambiguously observed in (001)-grown n-type GaAs quantum well (QW) structures in the absence of any external magnetic field. Resonant inter-subband transitions have been obtained making use of the tunability of the free-electron laser FELIX. It is shown that a helicity dependent photocurrent along one of the <110> axes is predominantly contributed by the spin-galvanic effect while that along the perpendicular in-plane axis is mainly due to the circular photogalvanic effect. This strong non-equivalence of the [110] and [110] directions is determined by the interplay between bulk and structural inversion asymmetries. A microscopic theory of the spin-galvanic effect for direct inter-subband optical transitions has been developed being in good agreement with experimental findings.
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