The 1/3-shot noise suppression in diffusive nanowires

Details The 1/3-shot noise suppression in diffusive nanowires The 1/3-shot noise suppression in diffusive nanowires

1998-08-04

arxiv.org/abs/cond-mat/9808042v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 figures

Scientific paper

10.1103/PhysRevB.59.2871

We report low-temperature shot noise measurements of short diffusive Au wires attached to electron reservoirs of varying sizes. The measured noise suppression factor compared to the classical noise value $2e\left| I\right| $ strongly depends on the electric heat conductance of the reservoirs. For small reservoirs injection of hot electrons increases the measured noise and hence the suppression factor. The universal 1/3-suppression factor can only asymptotically be reached for macroscopically large and thick electron reservoirs. A heating model based on the Wiedemann-Franz law is used to explain this effect.

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