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Fano factor reduction on the 0.7 conductance structure of a ballistic one-dimensional wire
P Roche1, J Ségala, D C Glattli
1Nanoelectronic group, Service de Physique de l'Etat Condensé, CEA Saclay, F-91191 Gif-sur-Yvette, France.
Abstract:
We have measured the nonequilibrium current noise in a ballistic one-dimensional wire which exhibits an additional conductance plateau at 0.7x2e(2)/h. The Fano factor shows a clear reduction on the 0.7 structure, and eventually vanishes upon applying a strong parallel magnetic field. These results provide experimental evidence that the 0.7 structure is associated with two conduction channels that have different transmission probabilities.
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