Shot-noise in transport and beam experiments

Details Shot-noise in transport and beam experiments Shot-noise in transport and beam experiments

2002-12-02

arxiv.org/abs/cond-mat/0212030v1

Physical Review Letters 87, 216807 (2001)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.87.216807

Consider two Fermi gases with the same {\it average} currents: a transport gas, as in solid-state experiments where the chemical potentials of terminal 1 is $\mu+eV$ and of terminal 2 and 3 is $\mu$, and a beam, i.e., electrons entering only from terminal 1 having energies between $\mu$ and $\mu+eV$. By expressing the current noise as a sum over single-particle transitions we show that the temporal current fluctuations are very different: The beam is noisier due to allowed single-particle transitions into empty states below $\mu$. Surprisingly, the correlations between terminals 2 and 3 are the same.

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