Excitonic condensation in quasi-two-dimensional systems

Abstract We present a low energy model for the Bose–Einstein condensation in a quasi-two-dimensional excitonic gas. Using the flow equations of the renormalization group and a Φ 4 model with the dynamical critical exponent z = 2 we calculate the temperature dependence of the critical density, coherence length, magnetic susceptibility, and specific heat. The model can be relevant for the macroscopic coherence observed in GaAs/AlGaAs coupled quantum wells.