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Phonon-induced quantum ratchet in the exciton spin dynamics in diluted magnetic semiconductors in a magnetic field

Title data

Ungar, Florian ; Cygorek, Moritz ; Axt, Vollrath Martin:
Phonon-induced quantum ratchet in the exciton spin dynamics in diluted magnetic semiconductors in a magnetic field.
In: Physical Review B. Vol. 99 (2019) Issue 7 . - Art.Nr. 075301.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.99.075301

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Magnetically doped semiconductors are well known for their giant Zeeman splittings which can reach several meV even in relatively small external magnetic fields. After preparing a nonequilibrium exciton distribution via optical excitation, the spin dynamics in diluted magnetic semiconductor quantum wells is typically governed by spin-flip scattering processes due to the exciton-impurity exchange interaction. Our theoretical calculations show that the giant Zeeman splitting in these materials in combination with the influence of longitudinal acoustic phonons lead to a quantum ratchet-type dynamics, resulting in an almost complete reversal of the carrier spin polarization at very low temperatures. Furthermore, we find that the predictions of a much simpler rate-equation approach qualitatively agree with a more advanced and numerically demanding quantum-kinetic description of the spin dynamics for a wide range of temperatures, although quantitative differences are noticeable.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: quantum ratched; giant Zeeman splitting; diluted magnetic semiconductors; DMS; spintronics; carrier-impurity correlations; carrier-dopant correlations; nonmagnetic scattering; exchange interaction; built-up of correlation energy; strongly correlated systems
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: 07 Feb 2019 07:09
Last Modified: 07 Feb 2019 07:09
URI: https://eref.uni-bayreuth.de/id/eprint/47215