Olbrich, Peter and Zoth, Christina and Lutz, Peter and Drexler, Christoph and Belkov, Vassilij and Terent'ev, Ya.V. and Tarasenko, Sergey and Semenov, A. N. and Ivanov, S. V. and Yakovlev, D.R. and Wojtowicz, Tomasz and Wurstbauer, U. and Schuh, Dieter and Ganichev, Sergey (2012) Spin-polarized electric currents in diluted magnetic semiconductor heterostructures induced by terahertz and microwave radiation. Physical Review B (PRB) 86 (8), 085310.
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Other URL: http://arxiv.org/pdf/1204.6163v1.pdf
We report on the study of spin-polarized electric currents in diluted magnetic semiconductor (DMS) quantum wells subjected to an in-plane external magnetic field and illuminated by microwave or terahertz radiation. The effect is studied in (Cd,Mn)Te/(Cd,Mg)Te quantum wells (QWs) and (In,Ga)As/InAlAs:Mn QWs belonging to the well known II-VI and III-V DMS material systems, as well as, in heterovalent AlSb/InAs/(Zn,Mn)Te QWs which represent a promising combination of II-VI and III-V semiconductors. Experimental data and developed theory demonstrate that the photocurrent originates from a spin-dependent scattering of free carriers by static defects or phonons in the Drude absorption of radiation and subsequent relaxation of carriers. We show that in DMS structures the efficiency of the current generation is drastically enhanced compared to non-magnetic semiconductors. The enhancement is caused by the exchange interaction of carrier spins with localized spins of magnetic ions resulting, on the one hand, in the giant Zeeman spin-splitting, and, on the other hand, in the spin-dependent carrier scattering by localized Mn2+ ions polarized by an external magnetic field.
|Date:||27 April 2012|
|Institutions:|| Physics > Institute of Experimental and Applied Physics > Professor Ganichev > Group Sergey Ganichev|
Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Dominique Bougeard
|Projects:||SFB 689: Spinphänomene in reduzierten Dimensionen|
|Subjects:||500 Science > 530 Physics|
|Created at the University of Regensburg:||Yes|
|Deposited On:||09 Jul 2012 14:40|
|Last Modified:||15 Mar 2013 07:09|