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arXiv · 1506.00305

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

Dmitry K. Efimkin·Victor Galitski
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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.

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Dmitry K. Efimkin, Victor Galitski. 2016-01-27. Anomalous Coulomb Drag in Electron-Hole Bilayers due to the Formation of Excitons. https://doi.org/10.1103/physrevlett.116.046801

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