Anisotropic exchange interaction induced by a single photon in semiconductor microcavities

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We investigate coupling of localized spins in a semiconductor quantum dot embedded in a microcavity. The lowest cavity mode and the quantum dot exciton are coupled and close in energy, forming a polariton. The fermions forming the exciton interact with localized spins via exchange. Exact diagonaliza...

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Detalles Bibliográficos
Autores principales: Chiappe, G., Fernández-Rossier, J., Louis, E., Anda, E.V.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_10980121_v72_n24_p_Chiappe
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_10980121_v72_n24_p_Chiappe
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spelling todo:paper_10980121_v72_n24_p_Chiappe2023-10-03T16:05:57Z Anisotropic exchange interaction induced by a single photon in semiconductor microcavities Chiappe, G. Fernández-Rossier, J. Louis, E. Anda, E.V. We investigate coupling of localized spins in a semiconductor quantum dot embedded in a microcavity. The lowest cavity mode and the quantum dot exciton are coupled and close in energy, forming a polariton. The fermions forming the exciton interact with localized spins via exchange. Exact diagonalization of a Hamiltonian in which photons, spins, and excitons are treated quantum mechanically shows that a single polariton induces a sizable indirect anisotropic exchange interaction between spins. At sufficiently low temperatures strong ferromagnetic correlations show up without an appreciable increase in exciton population. In the case of a (Cd,Mn)Te quantum dot, Mn-Mn ferromagnetic coupling is still significant at 1K: spin-spin correlation around 3 for exciton occupation smaller than 0.3. We find that the interaction mediated by photon-polaritons is 10 times stronger than the one induced by a classical field for equal Rabi splitting. © 2005 The American Physical Society. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10980121_v72_n24_p_Chiappe
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description We investigate coupling of localized spins in a semiconductor quantum dot embedded in a microcavity. The lowest cavity mode and the quantum dot exciton are coupled and close in energy, forming a polariton. The fermions forming the exciton interact with localized spins via exchange. Exact diagonalization of a Hamiltonian in which photons, spins, and excitons are treated quantum mechanically shows that a single polariton induces a sizable indirect anisotropic exchange interaction between spins. At sufficiently low temperatures strong ferromagnetic correlations show up without an appreciable increase in exciton population. In the case of a (Cd,Mn)Te quantum dot, Mn-Mn ferromagnetic coupling is still significant at 1K: spin-spin correlation around 3 for exciton occupation smaller than 0.3. We find that the interaction mediated by photon-polaritons is 10 times stronger than the one induced by a classical field for equal Rabi splitting. © 2005 The American Physical Society.
format JOUR
author Chiappe, G.
Fernández-Rossier, J.
Louis, E.
Anda, E.V.
spellingShingle Chiappe, G.
Fernández-Rossier, J.
Louis, E.
Anda, E.V.
Anisotropic exchange interaction induced by a single photon in semiconductor microcavities
author_facet Chiappe, G.
Fernández-Rossier, J.
Louis, E.
Anda, E.V.
author_sort Chiappe, G.
title Anisotropic exchange interaction induced by a single photon in semiconductor microcavities
title_short Anisotropic exchange interaction induced by a single photon in semiconductor microcavities
title_full Anisotropic exchange interaction induced by a single photon in semiconductor microcavities
title_fullStr Anisotropic exchange interaction induced by a single photon in semiconductor microcavities
title_full_unstemmed Anisotropic exchange interaction induced by a single photon in semiconductor microcavities
title_sort anisotropic exchange interaction induced by a single photon in semiconductor microcavities
url http://hdl.handle.net/20.500.12110/paper_10980121_v72_n24_p_Chiappe
work_keys_str_mv AT chiappeg anisotropicexchangeinteractioninducedbyasinglephotoninsemiconductormicrocavities
AT fernandezrossierj anisotropicexchangeinteractioninducedbyasinglephotoninsemiconductormicrocavities
AT louise anisotropicexchangeinteractioninducedbyasinglephotoninsemiconductormicrocavities
AT andaev anisotropicexchangeinteractioninducedbyasinglephotoninsemiconductormicrocavities
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