1D-1D Coulomb Drag Signature of a Luttinger Liquid

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Science  07 Feb 2014:
Vol. 343, Issue 6171, pp. 631-634
DOI: 10.1126/science.1244152

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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.


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 Embedded Image kelvin. This crossover in Coulomb drag behavior is consistent with Tomonaga-Luttinger liquid models for the 1D-1D drag between quantum wires.

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