Nonperturbative correlation effects in diluted magnetic semiconductors

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 spi...

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Detalles Bibliográficos
Autor principal: Tamborenea, Pablo Ignacio
Publicado: 2016
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_24699950_v93_n3_p_Cygorek
http://hdl.handle.net/20.500.12110/paper_24699950_v93_n3_p_Cygorek
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_24699950_v93_n3_p_Cygorek
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spelling paper:paper_24699950_v93_n3_p_Cygorek2023-06-08T16:36:12Z Nonperturbative correlation effects in diluted magnetic semiconductors Tamborenea, Pablo Ignacio 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. Fil:Tamborenea, P.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_24699950_v93_n3_p_Cygorek http://hdl.handle.net/20.500.12110/paper_24699950_v93_n3_p_Cygorek
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description 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.
author Tamborenea, Pablo Ignacio
spellingShingle Tamborenea, Pablo Ignacio
Nonperturbative correlation effects in diluted magnetic semiconductors
author_facet Tamborenea, Pablo Ignacio
author_sort Tamborenea, Pablo Ignacio
title Nonperturbative correlation effects in diluted magnetic semiconductors
title_short Nonperturbative correlation effects in diluted magnetic semiconductors
title_full Nonperturbative correlation effects in diluted magnetic semiconductors
title_fullStr Nonperturbative correlation effects in diluted magnetic semiconductors
title_full_unstemmed Nonperturbative correlation effects in diluted magnetic semiconductors
title_sort nonperturbative correlation effects in diluted magnetic semiconductors
publishDate 2016
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_24699950_v93_n3_p_Cygorek
http://hdl.handle.net/20.500.12110/paper_24699950_v93_n3_p_Cygorek
work_keys_str_mv AT tamboreneapabloignacio nonperturbativecorrelationeffectsindilutedmagneticsemiconductors
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