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Dependence of quantum kinetic effects in the spin dynamics of diluted magnetic semiconductors on the excitation conditions

Title data

Cygorek, Moritz ; Ungar, Florian ; Tamborenea, Pablo I. ; Axt, Vollrath Martin:
Dependence of quantum kinetic effects in the spin dynamics of diluted magnetic semiconductors on the excitation conditions.
In: Drouhin, Henri-Jean ; Wegrowe, Jean-Eric ; Razeghi, Manijeh (ed.): Spintronics IX. - Bellingham, Washington, USA : SPIE , 2016 . - Art.Nr. 993147, 13 Seiten . - (Proceedings of SPIE ; 9931 )
ISBN 978-1-5106-0253-3
DOI: https://doi.org/10.1117/12.2235914

Project information

Project financing: We gratefully acknowledge the financial support from the Universidad de Buenos Aires, project UBACyT 2014-2017 No. 20020130100514BA, and from CONICET, project PIP 11220110100091

Abstract in another language

Non-Markovian quantum kinetic features, that cannot be captured by rate equations, have been predicted theoretically in the spin dynamics in diluted magnetic semiconductors excited with a circularly polarized laser. In order to identify situations which are most promising for detecting the genuine quantum kinetic effects in future experiments, we study numerically the strength of these effects for a number of different excitation conditions. In particular, we show that laser pulse durations of the order of the spin-transfer rate or longer are well suited for studying the non-Markovian effects. Furthermore, in the presence of an external magnetic field, the quantum kinetic theory predicts a significantly different stationary value for the carrier spin polarization than Markovian rate equations, which can be attributed to the build-up of strong carrier-impurity correlations.

Further data

Item Type: Article in a book
Refereed: Yes
Keywords: diluted magnetic semiconductors; DMS; spintronics; quantum kinetics;
carrier-dopant correlations; spin transfer; exchange interaction; spin polarized carriers
Subject classification: condensed matter physics (theoretical)
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: 21 Aug 2019 07:20
Last Modified: 30 Oct 2019 09:18
URI: https://eref.uni-bayreuth.de/id/eprint/51947