Charge transport and phase transition in exciton rings

Details Charge transport and phase transition in exciton rings Charge transport and phase transition in exciton rings

2003-08-06

arxiv.org/abs/cond-mat/0308117v1

Phys. Rev. Lett. 92, 117404 (2004)

Physics

Condensed Matter

8 pages including 4 figures

Scientific paper

10.1103/PhysRevLett.92.117404

The 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.

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