Distribution of conduction channels in nanoscale contacts: Evolution towards the diffusive limit

Abstract

We present an experimental determination of the conduction channel distribution in lead nanoscale contacts with total conductances ranging from 1 to 15 G0, where G0=2e2/h. It is found that even for contacts having a cross section much smaller than the mean free path the distribution tends to be remarkably close to the universal diffusive limit. With the help of theoretical calculations we show that this behavior can be associated with the specific band structure of lead which produces a significant contribution of partially open channels even in the absence of atomic disorder. Published in Europhysics Letters, http://www.edpsciences.org/articles/epl/abs/2005/11/epl8748/epl8748.html

References in corpus (7)

• Random-Matrix Theory of Quantum Transport
• Quantum properties of atomic-sized conductors
• Hamiltonian approach to the transport properties of superconducting quantum point contacts
• AC JOSEPHSON EFFECT IN A SINGLE QUANTUM CHANNEL
• Microscopic origin of the conducting channels in metallic atomic-size contacts
• Evidence for saturation of channel transmission from conductance fluctuations in atomic-size point contacts
• Universal distribution of transparencies in highly conductive Nb/AlO${}_x$/Nb junctions

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