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

UNGAR, FLORIAN; CYGOREK, MORITZ; TAMBORENEA, P. I.; AXT, V.M.

Salamanca

Conferencia; EDISON'19: 19th International Conference on Electron Dynamics in Semiconductors, Optoelectronics and Nanostructures; 2015

Universidad de Salamanca

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 dependenceof 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.