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Origins of overshoots in the exciton spin dynamics in semiconductors

Title data

Ungar, Florian ; Cygorek, M. ; Axt, Vollrath Martin:
Origins of overshoots in the exciton spin dynamics in semiconductors.
In: Physical Review B. Vol. 99 (2019) Issue 16 . - No. 165308.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.99.165308

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

We investigate the origin of overshoots in the exciton spin dynamics after resonant optical excitation. As a material system, we focus on diluted magnetic semiconductor quantum wells as they provide a strong spin-flip scattering for the carriers. Our study shows that overshoots can appear as a consequence of radiative decay even on the single-particle level in a theory without any memory. The magnitude of the overshoots in this case depends strongly on the temperature as well as the doping fraction of the material. If many-body effects beyond the single-particle level become important so that a quantum-kinetic description is required, a spin overshoot appears already without radiative decay and is much more robust against variations of system parameters. We show that the origin of the spin overshoot can be determined either via its temperature dependence or via its behavior for different doping fractions. The results can be expected to apply to a wide range of semiconductors as long as radiative decay and a spin-flip mechanism are present.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: condensed matter physics (theoretical)
Keywords: spin overshoot; dark excitons; diluted magnetic semiconductors; DMS; spintronics; carrier-impurity correlations; carrier-dopant correlations; nonmagnetic scattering; exchange interaction; built-up of correlation energ; strongly correlated systems; phonons
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: 26 Apr 2019 06:19
Last Modified: 26 Apr 2019 06:19
URI: https://eref.uni-bayreuth.de/id/eprint/48724