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Many-body correlations brought to light in absorption spectra of diluted magnetic semiconductors

Title data

Ungar, Florian ; Cygorek, M. ; Axt, Vollrath Martin:
Many-body correlations brought to light in absorption spectra of diluted magnetic semiconductors.
In: Physical Review B. Vol. 98 (2018) Issue 16 . - Art.Nr. 161201, 6 S. + 5 S. Suppl..
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.98.161201

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Diluted magnetic semiconductors are materials well known to exhibit strong correlations which typically manifest in carrier-mediated magnetic ordering. In this Rapid Communication, we show that the interaction between excitons and magnetic impurities in these materials is even strong enough to cause a significant deviation from the bare exciton picture in linear absorption spectra of quantum well nanostructures. It is found that exciton-impurity correlations induce a characteristic fingerprint in the form of an additional feature close to the exciton resonance in combination with a shift of the main exciton line of up to a few meV. We trace back these features to the form of the self-energy and demonstrate that reliable values of the average correlation energy per exciton can be extracted directly from the spectra. Since the only requirement for our findings is sufficiently strong correlations, the results can be generalized to other strongly correlated systems.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: 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
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 04 Oct 2018 10:42
Last Modified: 04 Oct 2018 10:42
URI: https://eref.uni-bayreuth.de/id/eprint/45957