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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. © 2016 American Physical Society.

Registro:

Documento: Artículo
Título:Nonperturbative correlation effects in diluted magnetic semiconductors
Autor:Cygorek, M.; Tamborenea, P.I.; Axt, V.M.
Filiación:Theoretische Physik III, Universität Bayreuth, Bayreuth, 95440, Germany
Departamento de Física, IFIBA, FCEN, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón I, Ciudad de Buenos Aires, 1428, Argentina
Año:2016
Volumen:93
Número:3
DOI: http://dx.doi.org/10.1103/PhysRevB.93.035206
Título revista:Physical Review B
Título revista abreviado:Phys. Rev. B
ISSN:24699950
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_24699950_v93_n3_p_Cygorek

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Citas:

---------- APA ----------
Cygorek, M., Tamborenea, P.I. & Axt, V.M. (2016) . Nonperturbative correlation effects in diluted magnetic semiconductors. Physical Review B, 93(3).
http://dx.doi.org/10.1103/PhysRevB.93.035206
---------- CHICAGO ----------
Cygorek, M., Tamborenea, P.I., Axt, V.M. "Nonperturbative correlation effects in diluted magnetic semiconductors" . Physical Review B 93, no. 3 (2016).
http://dx.doi.org/10.1103/PhysRevB.93.035206
---------- MLA ----------
Cygorek, M., Tamborenea, P.I., Axt, V.M. "Nonperturbative correlation effects in diluted magnetic semiconductors" . Physical Review B, vol. 93, no. 3, 2016.
http://dx.doi.org/10.1103/PhysRevB.93.035206
---------- VANCOUVER ----------
Cygorek, M., Tamborenea, P.I., Axt, V.M. Nonperturbative correlation effects in diluted magnetic semiconductors. Phys. Rev. B. 2016;93(3).
http://dx.doi.org/10.1103/PhysRevB.93.035206