Coulomb drag rate in a coupled electron-electron quantum wire system

Abstract

In this paper, we calculate the Coulomb drag rate in a coupled electron-electron (e-e) quantum wire system over a wide range of temperature T, and some selected values of electron number densityandinter-wire spacing. The intra- and inter-wire exchange-correlations are treated within the self-consistent mean-field approximation of Singwi et al (the so called STLS theory) suitably generalized to the coupled system at finite-T. At a fixed T, the drag rate is found to increase with decrease in inter-wire separation and/or electron number density due to increased intra- and inter-wire coupling among electrons. Further, we note that the magnitude of drag rate is more in the STLS theory as compared to the random-phase approximation (RPA), and the difference consistently increases with decrease in inter-wire spacing.