Coulomb drag in a quasiclassical magnetic field

Abstract

We consider theoretically the Coulomb drag effect in a wide interval of magnetic field H and temperature Δ≪ℏωc,T≪EF, where Δ is the width of the Landau level due to disorder and ωc is the cyclotron frequency. The quantization of the electron spectrum leads to rich parametric dependences of transresistance on temperature and magnetic field. In particular, new small energy scales (for example, Δ≪T) play the role of characteristic cut-off energies (instead of the temperature at H=0) which leads to a linear temperature dependence of transresistance even in a weak magnetic field. We show that even at low temperatures T>ℏωc a new mechanism of the Coulomb drag which is due to resonant tunneling of the magnetoplasmons between the layers occurs in the system.