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Nonperturbative correlation effects in diluted magnetic semiconductors

Titelangaben

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

Angaben zu Projekten

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

Abstract

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.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
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
Institutionen der Universität: Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Theoretische Physik III > Lehrstuhl Theoretische Physik III - Univ.-Prof. Dr. Martin Axt
Fakultäten
Fakultäten > Fakultät für Mathematik, Physik und Informatik
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Theoretische Physik III
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Eingestellt am: 03 Nov 2017 11:01
Letzte Änderung: 03 Nov 2017 11:01
URI: https://eref.uni-bayreuth.de/id/eprint/40286