Condensed Matter and Biological Physics Seminars

In a strictly one-dimensional (1D) system electron-electron (e-e) correlations are much stronger than in two- or three-dimensional systems. Consequently, the low-temperature properties of a strongly-correlated 1D system are not described by the conventional Fermi-liquid theory, but are mostly captured by the Luttinger liquid (LL) model of 1D electron systems. One of the ways to experimentally probe the e-e correlations in the LL state is to study the Coulomb drag between two parallel Luttinger liquids. The drag effect in a 1D system is very sensitive to e-e correlations and results in distinctive features that are absent in the drag between 2D systems. We shall present a brief summary of the experimental work we have done on Coulomb drag between 1D electron systems and discuss the various observed experimental features and how they can be understood in the framework of the LL model. We shall focus our discussion on the temperature dependence of the drag resistance and how the latter depends on the Fermi momentum kF and any mismatch of kF between the two LL liquids.