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

19th International Conference on Electron Dynamics in Semiconductors, Optoelectronics and Nanostructures

Ungar, F.^1 ; Cygorek, M.^1 ; Tamborenea, P.I.^1,2 ; Axt, V.M.^1

Theoretische Physik III, Universität Bayreuth, Bayreuth

95440, Germany^1

Departamento de Física and IFIBA, FCEN, Universidad de Buenos Aires, Ciudad Universitaria, Pab. i, Buenos Aires

C1428EHA, Argentina^2

关键词: Coherent oscillations;    Electronic correlation;    Electronic spins;    Excess energy;    Magnetic quantum wells;    Rashba spin-orbit coupling;    Spin orbit interactions;    Ultra-fast;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/647/1/012010/pdf
DOI  :  10.1088/1742-6596/647/1/012010

来源: IOP

【 摘 要 】

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 Hg1-x-yMnxCdyTe 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.