TY - JOUR
T1 - Coulomb drag in quantum circuits
AU - Levchenko, Alex
AU - Kamenev, Alex
PY - 2008/11/21
Y1 - 2008/11/21
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.101.216806
DO - 10.1103/PhysRevLett.101.216806
M3 - Article
AN - SCOPUS:56849118514
SN - 0031-9007
VL - 101
JO - Physical review letters
JF - Physical review letters
IS - 21
M1 - 216806
ER -