Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-12-17
PRB 80, 125323 (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages + 3 EPS figures (replaced with published version)
Scientific paper
10.1103/PhysRevB.80.125323
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 $T\sim1.5{\rm K}$ 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-Sj\"olander 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)]
Beere Harvey E.
Croxall A. F.
Farrer Ian
Gupta Das K.
Nicoll Christine A.
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