Coulomb drag in quantum circuits

Alex Levchenko, Alex Kamenev

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


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.

Original languageEnglish (US)
Article number216806
JournalPhysical review letters
Issue number21
StatePublished - Nov 21 2008


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