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Ultrafast spin dynamics in II-VI diluted magnetic semiconductors with spin-orbit interaction

Title data

Ungar, Florian ; Cygorek, Moritz ; Tamborenea, P. I. ; Axt, Vollrath M.:
Ultrafast spin dynamics in II-VI diluted magnetic semiconductors with spin-orbit interaction.
In: Physical Review B. Vol. 91 (2015) Issue 19 . - Art.Nr. 195201, 8 S..
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.91.195201

Project information

Project financing: Deutsche Forschungsgemeinschaft
Supported by the Universidad de Buenos Aires, UBACyT Project No. 20020100100741 and from CONICET, Project PIP No. 11220110100091.

Abstract in another language

We study theoretically the ultrafast spin dynamics of II-VI diluted magnetic semiconductors in the presence of spin-orbit interaction. Our goal is to explore the interplay or competition between the exchange sd coupling and the spin-orbit interaction in both bulk and quantum-well systems. For bulk materials we concentrate on Zn1−xMnxSe and take into account the Dresselhaus interaction, while for quantum wells we examine Hg1−x−yMnxCdyTe systems with a strong Rashba coupling. Our calculations were performed with a recently developed formalism which incorporates electronic correlations beyond mean-field theory originating from the exchange sd coupling. For both bulk and quasi-two-dimensional systems we find that, by varying the system parameters within realistic ranges, either of the two interactions can be chosen to play a dominant role or they can compete on an equal footing with each other. The most notable effect of the spin-orbit interaction in both types of system is the appearance of strong oscillations where the exchange sd coupling by itself causes only an exponential decay of the mean electronic spin components. The mean-field approximation is also studied and an analytical interpretation is given as to why it shows a strong suppression of the spin-orbit-induced dephasing of the spin component parallel to the Mn magnetic field.

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; spin-orbit interaction; magnetic quantum wells; Rashba coupling; Dresselhaus interaction; ultrafast dynamics; quasi-two-dimensional systems
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 12:26
Last Modified: 02 Nov 2017 12:26
URI: https://eref.uni-bayreuth.de/id/eprint/40276