1D Coulomb drag in the ultra-low temperature limit

We report temperature dependence measurements of 1D Coulomb drag in GaAs/AlGaAs quantum wires.  Utilizing enhanced filtering and a nuclear magnetization stage, 1D electron temperatures below 10 mK have been achieved.  The drag resistance R_D exhibits the standard modulation as the wires’ subband occupancy is varied.  The temperature dependence of R_D as a function of both subband occupancy and interwire separation has been studied.  The qualitative and quantitative functional shape of this dependence is utilized to determine the parametric evolution of the dominant drag inducing scattering mechanisms in the ultra-low temperature limit.