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Nonperturbative correlation effects in diluted magnetic semiconductors

Title data

Cygorek, Moritz ; Tamborenea, P. I. ; Axt, Vollrath M.:
Nonperturbative correlation effects in diluted magnetic semiconductors.
In: Physical Review B. Vol. 93 (2016) Issue 3 . - Art.Nr. 035206, 10 S..
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.93.035206

Project information

Project financing: Deutsche Forschungsgemeinschaft
Supported by the Universidad de Buenos Aires, project UBACyT 2011-2014 No. 20020100100741, and from CONICET, project PIP 11220110100091.

Abstract in another language

The effects of carrier-impurity correlations due to a Kondo-like spin-spin interaction in diluted magnetic semiconductors are investigated. These correlations are not only responsible for a transfer of spins between the carriers and the impurities, but also produce nonperturbative effects in the spin dynamics such as renormalization of the precession frequency of the carrier spins, which can reach values of several percent in CdMnTe quantum wells. In two-dimensional systems, the precession frequency renormalization for a single electron spin with defined wave vector shows logarithmic divergences similar to those also known from the Kondo problem in metals. For smooth electron distributions, however, the divergences disappear due to the integrability of the logarithm. A possible dephasing mechanism caused by the wave-vector dependence of the electron spin precession frequencies is found to be of minor importance compared to the spin transfer from the carrier to the impurity system. In the Markov limit of the theory, an expression for the stationary carrier-impurity correlation energy can be deduced indicating the formation of weakly correlated carrier-impurity states with binding energies in the μeV range.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: diluted magnetic semiconductors; DMS; spintronics; carrier-dopant correlations; spin transfer; exchange interaction; Kondo-type correlations; spin polarized carriers; renormalization of the spin precession frequency; nonperturbative correlations
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: 03 Nov 2017 11:01
Last Modified: 03 Nov 2017 11:01
URI: https://eref.uni-bayreuth.de/id/eprint/40286