Disordered electron liquid in double quantum well heterostructures:   Renormalization group analysis and dephasing rate
  We report a detailed study of the influence of the electron-electron interaction on physical observables (conductance, etc.) of a disordered electron liquid in double quantum well heterostructure. We find that even in the case of common elastic scattering off electrons in both quantum wells, the asymmetry in the electron-electron interaction across and within quantum wells decouples them at low temperatures. Our results are in quantitative agreement with recent transport experiments on the gated double quantum well Al$_x$Ga$_{1-x}$As/GaAs/Al$_x$Ga$_{1-x}$As heterostructures. 
I.S. Burmistrov, I.V. Gornyi, and K.S. Tikhonov
cond-mat.mes-hall cond-mat.str-el