Interlayer coherence and drag effect in double layers with correlated impurity potentials

Suggesting a novel sample design (impurities in the middle of the barrier s eparating two quantum wells), we propose a method to investigate the Coulom b drag effect in double layers with correlated disorder. We predict that fo r strongly correlated impurity potentials the low-temperature drag will be substantially enhanced as compared to the conventional (uncorrelated) situa tion, due to a possibility of a coherent diffusive motion of carriers propa gating in different layers. The influence of magnetic field and interlayer tunneling is also discussed. (C) 2000 Elsevier Science B.V. All rights rese rved.