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Phonon impact on the dynamics of resonantly excited and hot excitons in diluted magnetic semiconductors

Title data

Ungar, Florian ; Cygorek, M. ; Axt, Vollrath Martin:
Phonon impact on the dynamics of resonantly excited and hot excitons in diluted magnetic semiconductors.
In: Physical Review B. Vol. 99 (2019) . - No. 115305.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.99.115305

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

"Phonons are well known to be the main mechanism for the coupling between bright and dark excitons in nonmagnetic semiconductors. Here, we investigate diluted magnetic semiconductors where this process is in direct competition with the scattering at localized magnetic impurities. To this end, a recently developed quantum kinetic description of the exciton spin dynamics in diluted magnetic semiconductor quantum wells is extended by the scattering with longitudinal acoustic phonons. A strong phonon impact is found in the redistribution of exciton momenta on the exciton parabola that becomes especially prominent for high temperatures and exciton distributions further away from the exciton resonance which are optically dark. Despite their impact on the energetic redistribution, acoustic phonons virtually do not affect the exciton spin dynamics as the exciton-impurity interaction always dominates. Furthermore, it turns out that the exciton spin lifetime increases by roughly one order of magnitude for nonequilibrium hot exciton distributions and, in addition, pronounced quantum kinetic signatures in the exciton spin dynamics appearing after resonant optical excitation are drastically reduced."

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: hot excitons; dark excitons; diluted magnetic semiconductors; DMS; spintronics; carrier-impurity correlations; carrier-dopant correlations; nonmagnetic scattering; exchange interaction; built-up of correlation energy; strongly correlated systems; phonons
Subject classification: condensed matter physics (theoretical)
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
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 11 Mar 2019 07:30
Last Modified: 11 Mar 2019 07:30
URI: https://eref.uni-bayreuth.de/id/eprint/47898