Interference oscillations of microwave photoresistance in double quantum   wells
  We observe oscillatory magnetoresistance in double quantum wells under microwave irradiation. The results are explained in terms of the influence of subband coupling on the frequency-dependent photoinduced part of the electron distribution function. As a consequence, the magnetoresistance demonstrates the interference of magneto-intersubband oscillations and conventional microwave- induced resistance oscillations. 
S. Wiedmann, G.M. Gusev, O.E. Raichev, T.E. Lamas, A.K. Bakarov, and   J.C. Portal