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Quantum kinetic equations for the ultrafast spin dynamics of excitons in diluted magnetic semiconductor quantum wells after optical excitation

Title data

Ungar, Florian ; Cygorek, Moritz ; Axt, Vollrath M.:
Quantum kinetic equations for the ultrafast spin dynamics of excitons in diluted magnetic semiconductor quantum wells after optical excitation.
In: Physical Review B. Vol. 95 (2017) Issue 24 . - Art.Nr. 245203, 17 S..
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.95.245203

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Quantum kinetic equations of motion for the description of the exciton spin dynamics in II-VI diluted magnetic semiconductor quantum wells with laser driving are derived. The model includes the magnetic as well as the nonmagnetic carrier-impurity interaction, the Coulomb interaction, Zeeman terms, and the light-matter coupling, allowing for an explicit treatment of arbitrary excitation pulses. Based on a dynamics-controlled truncation scheme, contributions to the equations of motion up to second order in the generating laser field are taken into account. The correlations between the carrier and the impurity subsystems are treated within the framework of a correlation expansion. For vanishing magnetic field, the Markov limit of the quantum kinetic equations formulated in the exciton basis agrees with existing theories based on Fermi's golden rule. For narrow quantum wells excited at the 1s exciton resonance, numerical quantum kinetic simulations reveal pronounced deviations from the Markovian behavior. In particular, the spin decays initially with approximately half the Markovian rate and a nonmonotonic decay in the form of an overshoot of up to 10% of the initial spin polarization is predicted.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: diluted magnetic semiconductors; DMS; spintronics; carrier-impurity correlations; carrier-dopant correlations; nonmagnetic scattering; spin transfer; exchange interaction; spin polarized carriers; quantum kintics; built-up of correlation energy; optical excitation; laser induced spin dynamics; ultrafast dynamics; nonlinear optics; exciton spin dynamics; dynamics controlled truncation
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: 06 Nov 2017 13:00
Last Modified: 06 Nov 2017 13:00
URI: https://eref.uni-bayreuth.de/id/eprint/40303