Coulomb drag in intermediate magnetic fields

We theoretically investigated the Coulomb drag effect in coupled two-dimens ional electron gases in a wide interval of magnetic field and temperature 1 /tau<<omega(c)<<E-F/h, T<<E-F, tau being the intralayer scattering time and omega(c) the cyclotron frequency. We show that quantization of the electro n spectrum leads to rich parametric dependences of the drag transresistance on the temperature and magnetic field. This is in contrast to usual resist ance. Small energy scales are found to cut typical excitation energies to v alues lower than temperature. This may lead to a linear temperature depende nce of the transresistance even in a relatively weak magnetic field, and ca n explain some recent experimental data. We present a mechanism of Coulomb drag when the current in the active layer causes a magnetoplasmon wind and the magnetoplasmons are absorbed by the electrons of the passive layer prov iding a momentum transfer. We derived general relations that describe the d rag as a result of resonant tunneling of magnetoplasmons. [S0163-1829(99)07 211-2].