Anisotropic exchange interaction induced by a single photon in semiconductor microcavities
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Título: | Anisotropic exchange interaction induced by a single photon in semiconductor microcavities |
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Autor/es: | Chiappe, Guillermo | Fernández-Rossier, Joaquín | Louis, Enrique | Anda, Enrique V. |
Grupo/s de investigación o GITE: | Grupo de Nanofísica | Física de la Materia Condensada | Materiales Avanzados |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Física Aplicada |
Palabras clave: | Localized spins | Semiconductor quantum dot | Microcavity | Single photon | Anisotropic exchange interaction |
Área/s de conocimiento: | Física de la Materia Condensada | Física Aplicada |
Fecha de publicación: | 8-dic-2005 |
Editor: | American Physical Society |
Cita bibliográfica: | 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 |
Resumen: | 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. |
Patrocinador/es: | 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. |
URI: | http://hdl.handle.net/10045/25223 |
ISSN: | 1098-0121 (Print) | 1550-235X (Online) |
DOI: | 10.1103/PhysRevB.72.245311 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2005 The American Physical Society |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1103/PhysRevB.72.245311 |
Aparece en las colecciones: | 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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