Scale Invariance and Universality in a Cold Gas of Indirect Excitons

Sergey Andreev (1) , Andrey Varlamov (2) , Alexey Kavokin (3, 4)

1 L2C - Laboratoire Charles Coulomb
2 CNR-SPIN and Department of Physics “E. Pancini
3 University of Southampton
4 Saint Petersburg State University of Information Technologies Mechanics and Optics

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.

Mots clés: Ultracold dipolar gases; excitons; semiconductor nanostructures

Domaines: Gaz Quantiques [cond-mat.quant-gas]

Sergey Andreev, Andrey Varlamov, Alexey Kavokin. Scale Invariance and Universality in a Cold Gas of Indirect Excitons. Physical Review Letters, 2014, 112, pp.036401. ⟨10.1103/PhysRevLett.112.036401⟩. ⟨hal-00936098⟩