Conductance and conductance fluctuations of <BR>narrow disordered quantum wires
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Conductance and conductance fluctuations of
narrow disordered quantum wires
K Nikolic and A MacKinnon
The Blackett Laboratory, Imperial College, Prince Consort Road, London SW7 2BZ, UK
Abstract:
In this paper we present and discuss our results for the conductance
and conductance fluctuations of narrow quantum wires with two types of
disorder: boundary roughness (hard wall confining potential) and
islands of strongly scattering impurities within the bulk of the wire.
We use a tight-binding Hamiltonian to describe the quantum wire,
infinite perfect leads, a two-terminal Landauer-type formula for the
conductance, and the recursive single-particle Green's function
technique. We find that conductance quantization is easily destroyed
by strong scattering. We also find that Anderson localization poses
a serious restriction on the high carrier mobility predicted in quantum
wires. Conductance fluctuations in narrow quantum wires are not, in
general, universal (as in the metallic regime), but can be independent of
the wire length over a short range of lengths.
Angus MacKinnon
Fri Nov 18 13:59:27 gmt 1994