Titlebar

Bibliografische Daten exportieren
Literatur vom gleichen Autor
plus auf ERef Bayreuth
plus bei Google Scholar

 

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

Titelangaben

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. Bd. 95 (2017) Heft 24 . - Art.Nr. 245203, 17 S..
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.95.245203

Angaben zu Projekten

Projektfinanzierung: Deutsche Forschungsgemeinschaft

Abstract

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.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
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
Institutionen der Universität: Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Theoretische Physik III > Lehrstuhl Theoretische Physik III - Univ.-Prof. Dr. Martin Axt
Fakultäten
Fakultäten > Fakultät für Mathematik, Physik und Informatik
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Theoretische Physik III
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Eingestellt am: 06 Nov 2017 13:00
Letzte Änderung: 06 Nov 2017 13:00
URI: https://eref.uni-bayreuth.de/id/eprint/40303