Aluminum arsenide cleaved-edge overgrown quantum wires

Details Aluminum arsenide cleaved-edge overgrown quantum wires Aluminum arsenide cleaved-edge overgrown quantum wires

2005-04-08

arxiv.org/abs/cond-mat/0504214v1

Appl. Phys. Lett. 87, 052101 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Submitted to Applied Physics Letters

Scientific paper

10.1063/1.1994955

We report conductance measurements in quantum wires made of aluminum arsenide, a heavy-mass, multi-valley 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, intra-wire backscattering which suppresses the transmission of 1D modes. Calculations are presented to demonstrate the role of strain in the 1D states of this cleaved-edge structure.

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