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Effective equations for the precession dynamics of electron spins and electron–impurity correlations in diluted magnetic semiconductors

Title data

Cygorek, Moritz ; Axt, Vollrath M.:
Effective equations for the precession dynamics of electron spins and electron–impurity correlations in diluted magnetic semiconductors.
In: Semiconductor Science and Technology. Vol. 30 (2015) Issue 8 . - Art.Nr. 085011, 10 S..
ISSN 0268-1242
DOI: https://doi.org/10.1088/0268-1242/30/8/085011

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Starting from a quantum kinetic theory for the spin dynamics in diluted magnetic semiconductors, we derive simplified equations that effectively describe the spin transfer between carriers and magnetic impurities for an arbitrary initial impurity magnetization. Taking the Markov limit of these effective equations, we obtain good quantitative agreement with the full quantum kinetic theory for the spin dynamics in bulk systems at high magnetic doping. In contrast, the standard rate description where the carrier–dopant interaction is treated according to Fermi’s golden rule, which involves the assumption of a short memory as well as a perturbative argument, has been shown previously to fail if the impurity magnetization is non-zero. The Markov limit of the effective equations is derived, assuming only a short memory, while higher order terms are still accounted for. These higher order terms represent the precession of the carrier–dopant correlations in the effective magnetic field due to the impurity spins. Numerical calculations show that the Markov limit of our effective equations reproduces the results of the full quantum kinetic theory very well. Furthermore, this limit allows for analytical solutions and for a physically transparent interpretation.

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; non-Markovian spin dynamics; memory effects; coherent spin dynamics; ultrafast dynamics; spin precession
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: 03 Nov 2017 09:27
Last Modified: 03 Nov 2017 09:27
URI: https://eref.uni-bayreuth.de/id/eprint/40270