Coulomb drag in a quasiclassical magnetic field

We consider theoretically the Coulomb drag effect in a wide interval of mag netic field H and temperature Delta much less than (h) over bar omega(c), T much less than E-F, where Delta is the width of the Landau level due to di sorder and omega(c) is the cyclotron frequency. The quantization of the ele ctron spectrum leads to rich parametric dependences of transresistance on t emperature and magnetic field. In particular, new small energy scales (for example, Delta much less than T) play the role of characteristic cut-off en ergies (instead of the temperature at H = 0) which leads to a linear temper ature dependence of transresistance even in a weak magnetic field. We show that even at low temperatures T > (h) over bar omega(c) a new mechanism of the Coulomb drag which is due to resonant tunneling of the magnetoplasmons between the layers occurs in the system. (C) 1998 Elsevier Science B.V. All rights reserved.