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Possible effect of collective modes in zero magnetic field transport in an electron-hole bilayer

Croxall, AF; Das Gupta, K; Nicoll, CA; Beere, HE; Farrer, I; Ritchie, DA; Pepper, M; (2009) Possible effect of collective modes in zero magnetic field transport in an electron-hole bilayer. PHYS REV B , 80 (12) , Article 125323. 10.1103/PhysRevB.80.125323.

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Abstract

We report single layer resistivities of two-dimensional electron and hole gases in an electron-hole bilayer with a 10 nm barrier. In a regime where the interlayer interaction is stronger than the intralayer interaction, we find that an insulating state (d rho/dT < 0) emerges at T similar to 1.5 K or lower, when both the layers are simultaneously present. This happens deep in the "metallic" regime, even in layers with k(F)l > 500, thus making conventional mechanisms of localization due to disorder improbable. We suggest that this insulating state may be due to a charge-density-wave phase, as has been expected in electron-hole bilayers from the Singwi-Tosi-Land-Sjolander approximation-based calculations of Liu et al. [Phys. Rev. B 53, 7923 (1996)]. Our results are also in qualitative agreement with recent path-integral Monte Carlo simulations of a two component plasma in the low-temperature regime [Ludwig et al., Contrib. Plasma Phys. 47, 335 (2007)]

Type:Article
Title:Possible effect of collective modes in zero magnetic field transport in an electron-hole bilayer
DOI:10.1103/PhysRevB.80.125323
Keywords:COULOMB DRAG, SYSTEMS, LAYERS
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering

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