Charge transport and phase transition in exciton rings

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dc.creatorButov, L. V.
dc.creatorLevitov, L. S.
dc.creatorMintsev, A. V.
dc.creatorSimons, B. D.
dc.creatorGossard, A. C.
dc.creatorChemla, D. S.
dc.date2003-08-06
dc.date.accessioned2026-07-07T09:31:41Z
dc.date.available2026-07-07T09:31:41Z
dc.descriptionThe macroscopic exciton rings observed in the photoluminescence (PL) patterns of excitons in coupled quantum wells (CQWs) are explained by a series of experiments and a theory based on the idea of carrier imbalance, transport and recombination. The rings are found to be a source of cold excitons with temperature close to that of the lattice. We explored states of excitons in the ring over a range of temperatures down to 380 mK. These studies reveal a sharp, albeit continuous, second order phase transition to a low-temperature ordered exciton state, characterized by ring fragmentation into a periodic array of aggregates. An instability at the onset of degeneracy in the cold exciton system, due to stimulated exciton formation, is proposed as the transition mechanism.
dc.description8 pages including 4 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0308117
dc.identifierhttp://arxiv.org/abs/cond-mat/0308117
dc.identifierPhys. Rev. Lett. 92, 117404 (2004)
dc.identifierdoi:10.1103/PhysRevLett.92.117404
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/158550
dc.subjectCondensed Matter
dc.titleCharge transport and phase transition in exciton rings
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