Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 23, Pages 4928-4931Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.4928
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We have analyzed Coulomb drag between currents of interacting electrons in two parallel one-dimensional conductors of finite length L attached to external reservoirs. For strong coupling, the relative fluctuations of electron density in the conductors acquire energy gap M. At energies larger than Gamma = const X nu- exp(-LM/nu-)/L + Gamma (+), where Gamma (+) is the impurity scattering rate, and, for L > nu-/M, where nu- is the fluctuation velocity, the gap leads to an ideal drag with almost equal currents in the conductors. At low energies the drag is suppressed by coherent instanton tunneling, and the zero-temperature transconductance vanishes, indicating the Fermi-liquid behavior.
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