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

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

2006-10-26

arxiv.org/abs/cond-mat/0610736v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 4 figures

Scientific paper

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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