Relaxation and coherent oscillations in the spin dynamics of II-VI diluted magnetic quantum wells

Titelangaben

Ungar, Florian ; Cygorek, Moritz ; Tamborenea, Pablo I. ; Axt, Vollrath Martin:
Relaxation and coherent oscillations in the spin dynamics of II-VI diluted magnetic quantum wells.
In: Journal of Physics: Conference Series. Bd. 647 (2015) Heft 1 . - 012010.
ISSN 1742-6596
DOI: https://doi.org/10.1088/1742-6596/647/1/012010

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Abstract

We study theoretically the ultrafast spin dynamics of II-VI diluted magnetic quantum wells in the presence of spin-orbit interaction. We extend a recent study where it was shown that the spin-orbit interaction and the exchange sd coupling in bulk and quantum wells can compete resulting in qualitatively new dynamics when they act simultaneously. We concentrate on Hg 1- x-y Mn x Cd y Te quantum wells, which have a highly tunable Rashba spin-orbit coupling. Our calculations use a recently developed formalism which incorporates electronic correlations originating from the exchange sd -coupling. We find that the dependence of electronic spin oscillations on the excess energy changes qualitatively depending on whether or not the spin-orbit interaction dominates or is of comparable strength with the sd interaction.