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Role of excited states in the dynamics of excitons and their spins in diluted magnetic semiconductors

Titelangaben

Ungar, Florian ; Cygorek, Moritz ; Axt, Vollrath Martin:
Role of excited states in the dynamics of excitons and their spins in diluted magnetic semiconductors.
In: Physical Review B. Bd. 99 (2019) Heft 19 . - 195309.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.99.195309

Angaben zu Projekten

Projektfinanzierung: Deutsche Forschungsgemeinschaft

Abstract

We theoretically investigate the impact of excited states on the dynamics of the exciton ground state in diluted magnetic semiconductor quantum wells. Exploiting the giant Zeeman shift in these materials, an external magnetic field is used to bring transitions between the exciton ground state and excited states close to resonance. It turns out that, when treating the exciton dynamics in terms of a quantum kinetic theory beyond the Markov approximation, higher exciton states are populated already well below the critical magnetic field required to bring the exciton ground state in resonance to an excited state. This behavior is explained by exciton-impurity correlations that can bridge energy differences on the order of a few meV and require a quantum kinetic description beyond the independent-particle picture. Of particular interest is the significant spin transfer toward states on the optically dark 2p exciton parabola which are protected against radiative decay.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: diluted magnetic semiconductors; DMS; spintronics; non-Markovian dynamics; dark states; dark excitons; carrier-impurity correlations; carrier-dopant correlations; exchange interaction; strongly correlated systems
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: 31 Mai 2019 07:03
Letzte Änderung: 03 Aug 2023 12:31
URI: https://eref.uni-bayreuth.de/id/eprint/49160