Dresden 2011 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 33: Spin-dependent Transport I
HL 33.6: Talk
Tuesday, March 15, 2011, 11:30–11:45, POT 251
Spin polarized electric currents in semiconductor heterostructures induced by microwave radiation — •C. Drexler1, V.V. Bel’kov2, B. Ashkinadze3, P. Olbrich1, C. Zoth1, V. Lechner1, Ya.V. Terent’ev2, D.R. Yakovlev2,4, G. Karczewski5, T. Wojtowicz5, D. Schuh1, W. Wegscheider1, and S.D. Ganichev1 — 1THz Center, Regensburg, Germany — 2Ioffe Institute, St. Petersburg, Russia — 3Technicon, Haifa, Israel — 4TU Dortmund, Germany — 5Polish Academy of Sciences, Warsaw, Poland
We report on microwave (mw) radiation induced electric currents in semi-magnetic CdMnTe and non-magnetic InAs:Si quantum wells subjected to an external in-plane magnetic field. The current generation is attributed to the spin-dependent energy relaxation of electrons heated by mw radiation. The relaxation produces equal and oppositely directed electron flows in the spin-up and spin-down subbands yielding a pure spin current. The Zeeman splitting of the subbands in the external magnetic field leads to the conversion of the spin flow into a spin-polarized electric current, which is proportional to the Zeeman splitting energy in non-magnetic structures. As a result we demonstrate, that the presence of magnetic Mn2+ ions yields an additional contribution to the microwave induced current formation which is related to the giant Zeeman spin splitting [1].
[1] C. Drexler et. al., Appl. Phys. Lett. 97, 182197 (2010).