Coulomb drag between quantum wires in the quasi-1D regime

We report Coulomb drag measurements in laterally-coupled single layer GaAs/AlGaAs quantum wires, enabling in situ tuning of their effective interwire separation. The drag resistance RD exhibits the standard modulation as the wires’ subband occupancy is varied. We mapped the temperature dependence of RD as a function of both subband occupancy and interwire separation in the quasi-1D regime were more than a single 1D subband is occupied. The qualitative and quantitative functional shape of this dependence is utilized to determine the parametric evolution of the dominant drag inducing scattering mechanism and of the strength of electron-electron interactions, respectively.