Scale invariance and universality in a cold gas of indirect excitons.
We address, theoretically, the puzzling similarity observed in the thermodynamic behavior of independent clouds of cold dipolar excitons in coupled semiconductor quantum wells. We argue that the condensation of self-trapped exciton gas starts at the same critical temperature in all traps due to the specific scaling rule. As a consequence of the reduced dimensionality of the system, the scaling parameters appear to be insensitive to disorder.
Laboratoire Charles Coulomb, Unité Mixte de Recherche 5221 CNRS/UM2, Université Montpellier 2, Place Eugne Bataillon, 34095 Montpellier Cedex, France.
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Andreev
CNR-SPIN, Tor Vergata, Viale del Politecnico 1, I-00133 Rome, Italy.
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Varlamov
Physics and Astronomy School, University of Southampton, Highfield, Southampton SO171BJ, United Kingdom and Spin Optics Laboratory, State University of Saint Petersburg, 1, Ulianovskaya 198504, Russia.
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Kavokin