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

Title data

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. Vol. 99 (2019) Issue 19 . - Art.Nr. 195309.
ISSN 2469-9969
DOI: https://doi.org/10.1103/PhysRevB.99.195309

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: diluted magnetic semiconductors; DMS; spintronics; non-Markovian dynamics; dark states; dark excitons; carrier-impurity correlations; carrier-dopant correlations; exchange interaction; strongly correlated systems
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: 31 May 2019 07:03
Last Modified: 31 May 2019 07:03
URI: https://eref.uni-bayreuth.de/id/eprint/49160