Prospecting for the superfluid transition in electron-hole coupled quantum wells using coulomb drag
I investigate the possibility of using Coulomb drag to detect a precursor of the predicted (but as yet not definitively observed) superfluid transition in electron-hole coupled quantum wells. The drag transresistivity rho(21) is shown to be significantly enhanced above the mean-field transition temperature T(c) and to diverge logarithmically as T-->T(+)(c), due to electron-hole pairing fluctuations which are somewhat analogous to the Maki-Thompson contribution to conductivity in metals above the superconducting T(c). The enhancement in rho(21) is estimated to be detectable at temperatures much higher than T(c).
Hu
BY
Department of Physics, University of Akron, Akron, Ohio 44325-4001, USA.