Aluminum arsenide cleaved-edge overgrown quantum wires

We report conductance measurements in quantum wires made of aluminum arsenide, a heavy-mass, multivalley one-dimensional (1D) system. Zero-bias conductance steps are observed as the electron density in the wire is lowered, with additional steps observable upon applying a finite dc bias. We attribute...

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Bibliographic Details
Published in:Applied physics letters 2005-08, Vol.87 (5), p.052101-052101-3
Main Authors: Moser, J., Zibold, T., Schuh, D., Bichler, M., Ertl, F., Abstreiter, G., Grayson, M., Roddaro, S., Pellegrini, V.
Format: Article
Language:English
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Summary:We report conductance measurements in quantum wires made of aluminum arsenide, a heavy-mass, multivalley one-dimensional (1D) system. Zero-bias conductance steps are observed as the electron density in the wire is lowered, with additional steps observable upon applying a finite dc bias. We attribute these steps to depopulation of successive 1D subbands. The quantum conductance is substantially reduced with respect to the anticipated value for a spin- and valley-degenerate 1D system. This reduction is consistent with disorder-induced, intrawire backscattering that suppresses the transmission of 1D modes. Calculations are presented to demonstrate the role of strain in the 1D states of this cleaved-edge structure.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1994955