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Observing the Upturn
When two parallel conducting wires are separated by a small insulating barrier, a current in one wire can generate a net charge displacement in the other by virtue of electron-electron interactions. Some of the models for this process predict a nonmonotonic temperature dependence of the resulting Coulomb drag voltage, with an upturn occurring at a certain low temperature T*. Laroche et al. (p. 631, published online 23 January) observed this upturn in a pair of vertically integrated quantum wires separated by a 15-nanometer-wide barrier.
Abstract
One-dimensional (1D) interacting electronic systems exhibit distinct properties when compared to their counterparts in higher dimensions. We report Coulomb drag measurements between vertically integrated quantum wires separated by a barrier only 15 nanometers wide. The temperature dependence of the drag resistance is measured in the true 1D regime where both wires have less than one 1D subband occupied. As a function of temperature, an upturn in the drag resistance is observed below a temperature 
kelvin. This crossover in Coulomb drag behavior is consistent with Tomonaga-Luttinger liquid models for the 1D-1D drag between quantum wires.
