Anisotropic exchange interaction induced by a single photon in semiconductor microcavities

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Title: Anisotropic exchange interaction induced by a single photon in semiconductor microcavities
Authors: Chiappe, Guillermo | Fernández-Rossier, Joaquín | Louis, Enrique | Anda, Enrique Victoriano
Research Group/s: Grupo de Nanofísica | Física de la Materia Condensada | Materiales Avanzados
Center, Department or Service: Universidad de Alicante. Departamento de Física Aplicada
Keywords: Localized spins | Semiconductor quantum dot | Microcavity | Single photon | Anisotropic exchange interaction
Knowledge Area: Física de la Materia Condensada | Física Aplicada
Issue Date: 8-Dec-2005
Publisher: American Physical Society
Citation: CHIAPPE, G., et al. “Anisotropic exchange interaction induced by a single photon in semiconductor microcavities”. Physical Review B. Vol. 72, No. 24 (2005). ISSN 1098-0121, pp. 245311-1/5
Abstract: 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 1 K: 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.
Sponsor: G.C. and J.F.R. acknowledge financial support from the Ramón y Cajal Program (MCyT, Spain) and from CAV, Grant No. GV05/152. Partial financial support by the Spanish MCYT (Grant Nos. MAT2002-04429-C03, MAT2003-08109-C02-01, and FIS200402356), the Brazilian agencies FAPERJ, CAPES, and CNPq, and the Argentinian UBACYT and CONICET.
ISSN: 1098-0121 (Print) | 1550-235X (Online)
DOI: 10.1103/PhysRevB.72.245311
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2005 The American Physical Society
Peer Review: si
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Appears in Collections:INV - Grupo de Nanofísica - Artículos de Revistas
INV - LMA - Artículos de Revistas
INV - Física de la Materia Condensada - Artículos de Revistas

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