Anomalous Coulomb Drag in Electron-Hole Bilayers due to the Formation of Excitons

Abstract

Several recent experiments have reported an anomalous temperature dependence of the Coulomb drag effect in electron-hole bilayers. Motivated by these puzzling data, we study theoretically a low-density electron-hole bilayer, where electrons and holes avoid quantum degeneracy by forming excitonic molecules. We describe the ionization-recombination crossover between the electron-hole plasma and exciton gas and calculate both the intralayer and drag resistivity as a function of temperature. The latter exhibits a minimum followed by a sharp upturn at low temperatures in a qualitative agreement with the experimental observations [see, e.g., J. A. Seamons et al., Phys. Rev. Lett. 102, 026804 (2009)]. Importantly, the drag resistivity in the proposed scenario is found to be rather insensitive to a mismatch in electron and hole concentrations in sharp contrast to the scenario of electron-hole Cooper pairing.

7 pages, 4 figures. Minor changes. Published version

References in corpus (9)

• Exciton Condensation and Perfect Coulomb Drag
• Coulomb Drag in the Exciton Regime in Electron-Hole Bilayers
• Anomalous Coulomb drag in electron-hole bilayers
• Bose glass and superfuid phases of cavity polaritons
• Density imbalance effect on the Coulomb drag upturn in an electron-hole bialyer
• Possible effect of collective modes in zero magnetic field transport in an electron-hole bilayer
• Transport and drag in undoped electron-hole bilayers
• Photoemission spectra of massless Dirac fermions on the verge of exciton condensation
• Boltzmann-Langevin theory of Coulomb drag

Cited by in corpus (9)

• Evidence of high-temperature exciton condensation in 2D atomic double layers
• Coulomb drag
• Excitons versus electron-hole plasma in monolayer transition metal dichalcogenide semiconductors
• Anomalous Hall Coulomb drag of massive Dirac fermions
• Multiband Mechanism for the Sign Reversal of Coulomb Drag Observed in Double Bilayer Graphene Heterostructures
• Coulomb drag in topological materials
• Superfluid drag between excitonic polaritons and superconducting electron gas
• Topological hybrid electron-hole Cooper pairing
• Anomalous drag in electron-hole condensates with granulated order