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.