title: Coulomb drag in quantum circuits.
abstract: We study the drag effect in a system of two electrically isolated quantum point contacts, coupled by Coulomb interactions. Drag current exhibits maxima as a function of quantum point contacts gate voltages when the latter are tuned to the transitions between quantized conductance plateaus. In the linear regime this behavior is due to enhanced electron-hole asymmetry near an opening of a new conductance channel. In the nonlinear regime the drag current is proportional to the shot noise of the driving circuit, suggesting that the Coulomb drag experiments may be a convenient way to measure the quantum shot noise. Remarkably, the transition to the nonlinear regime may occur at driving voltages substantially smaller than the temperature.
authors.affiliation: Department of Physics, University of Minnesota, Minneapolis, Minnesota 55455, USA.
authors.forename: Alex
authors.initials: A
authors.lastname: Levchenko
authors.forename: Alex
authors.initials: A
authors.lastname: Kamenev