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Quantum kinetic description of spin transfer in diluted magnetic semiconductors

Title data

Thurn, Christoph ; Axt, Vollrath M.:
Quantum kinetic description of spin transfer in diluted magnetic semiconductors.
In: Physical Review B. Vol. 85 (2012) Issue 16 . - Art.Nr. 165203, 17 S..
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.85.165203

Abstract in another language

We derive quantum kinetic equations of motion that describe laser-driven Mn-doped diluted semiconductors and account for the carrier Mn exchange interaction beyond the mean-field theory. We treat a spatially inhomogeneous system with arbitrary given positions of Mn dopants as well as an ensemble of randomly distributed Mn atoms in an infinite crystal, which represents an on average spatially homogeneous system. In the latter case, special care is taken of the interplay between higher-order correlations and the random positioning of Mn atoms. For the ensemble-averaged system, we explicitly identify the terms responsible for a spin transfer between spin-polarized carriers and Mn atoms in the special case valid, e.g., for paramagnetic samples without external magnetic field, where initially the total Mn magnetization vanishes. It turns out that here the mean-field approach as well as the virtual crystal approximation predict a vanishing spin transfer, in contrast to our quantum kinetic equations. Moreover, in our approach, the exchange interaction with the localized Mn atoms leads to a significant redistribution of the carrier momenta even in an on average spatially homogeneous system. The latter feature can not be described in the virtual crystal approximation.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: diluted magnetic semiconductors; DMS; spintronics; quantum kinetics; carrier-dopant correlations; spin transfer; exchange interaction; spin polarized carriers
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III > Chair Theoretical Physics III - Univ.-Prof. Dr. Martin Axt
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 02 Nov 2017 09:25
Last Modified: 02 Nov 2017 09:25
URI: https://eref.uni-bayreuth.de/id/eprint/40241