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Pure spin currents induced by spin-dependent scattering processes in SiGe quantum well structures

S. D. Ganichev·S. N. Danilov·V. V. Bel'kov·S. Giglberger·S. A. Tarasenko·E. L. Ivchenko·D. Weiss·W. Jantsch·F. Schaeffler·D. Gruber·W. Prettl
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Abstract

We show that spin-dependent electron-phonon interaction in the energy relaxation of a two-dimensional electron gas results in equal and oppositely directed currents in the spin-up and spin-down subbands yielding a pure spin current. In our experiments on SiGe heterostructures the pure spin current is converted into an electric current applying a magnetic field that lifts the cancellation of the two partial charge flows. A microscopic theory of this effect, taking account of the asymmetry of the relaxation process, is developed being in a good agreement with the experimental data.

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S. D. Ganichev, S. N. Danilov, V. V. Bel'kov, S. Giglberger, S. A. Tarasenko, E. L. Ivchenko, D. Weiss, W. Jantsch, F. Schaeffler, D. Gruber, W. Prettl. 2006-10-26. Pure spin currents induced by spin-dependent scattering processes in SiGe quantum well structures. https://doi.org/10.1103/physrevb.75.155317

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