Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-03-15
PRB 80,125317 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8 pages, 5 figures
Scientific paper
Motivated by a recent experiment of spatial and temperature dependent average exciton energy distribution in coupled quantum wells [S. Yang \textit{et al.}, Phys. Rev. B \textbf{75}, 033311 (2007)], we investigate the nature of the interactions in indirect excitons. Based on the uncertainty principle, along with a temperature and energy dependent distribution which includes both population and recombination effects, we show that the interplay between an attractive two-body interaction and a repulsive three-body interaction can lead to a natural and good account for the nonmonotonic temperature dependence of the average exciton energy. Moreover, exciton energy maxima are shown to locate at the brightest regions, in agreement with the recent experiments. Our results provide an alternative way for understanding the underlying physics of the exciton dynamics in coupled quantum wells.
Liu Char-Shine
Luo Hong-Gang
Wu Way-Chen
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