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

Abstract

We report single layer resistivities of 2-dimensional electron and hole gases in an electron-hole bilayer with a 10nm 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 $T\sim 1.5\mathrm{K}$ 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 localisation 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-Sjölander approximation based calculations of L. Liu {\it et al} [{\em Phys. Rev. B}, {\bf 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 [ P. Ludwig {\it et al}. {\em Contrib. Plasma Physics} {\bf 47}, No. 4-5, 335 (2007)]

arXiv comment5 pages + 3 EPS figures (replaced with published version)

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Cited by in corpus (8)

• Tunneling and Fluctuating Electron-Hole Cooper Pairs in Double Bilayer Graphene
• Stability of Sarma phases in density imbalanced electron-hole bilayer systems
• Anomalous Coulomb Drag in Electron-Hole Bilayers due to the Formation of Excitons
• Drag effect and Cooper electron-hole pair fluctuations in a topological insulator film
• Fluctuational internal Josephson effect in topological insulator film
• Coherent exciton transport in semiconductors
• Topological fluctuating electron-hole Cooper pairs in graphene-GaAs heterostructures
• Anomalous drag in electron-hole condensates with granulated order