On momentum transport in a system of two-dimensional superfluid Bose-gases separated by a thin layer

An effect of momentum transport between superfluid 2D Bose-gases separated by a thin layer is predicted on the basis on microscopic calculations. The effect is shown to exist both at nonzero temperatures and T=0 and only if the secondary circuit is closed. A relation between drag current and temperature and thickness of the separating layer is obtained for charged Bose-gases. An experiment is proposed to measure the effect predicted