The 0.7 structure in cleaved edge overgrowth wires

We study the conductance through long and ultra-clean one-dimensional conductors and find a conductance anomaly at low charge densities-similar to the so-called 0.7 structure found in short constrictions. Our wires, afforded by the cleaved edge overgrowth technique, allow a quantitative study of thi...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2008-04, Vol.20 (16), p.164204-164204 (9)
Main Authors: de Picciotto, R, Baldwin, K W, Pfieffer, L N, West, K W
Format: Article
Language:English
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Summary:We study the conductance through long and ultra-clean one-dimensional conductors and find a conductance anomaly at low charge densities-similar to the so-called 0.7 structure found in short constrictions. Our wires, afforded by the cleaved edge overgrowth technique, allow a quantitative study of this phenomenon in long wires. We find that this anomaly occurs whenever the kinetic energy provided to the carriers exceeds the Fermi energy. In this regime, the measured conductance is found to exceed the value naively expected from non-interacting models.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/20/16/164204