What quantity is measured in an excess noise experiment?

Details What quantity is measured in an excess noise experiment? What quantity is measured in an excess noise experiment?

2002-11-28

arxiv.org/abs/cond-mat/0211646v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 2 figures; contribution to "Quantum Noise" (Ya. M. Blanter and Yu. V. Nazarov, eds.)

Scientific paper

Consider a measurement in which the current coming out of a mesoscopic sample is filtered around a given frequency, amplified, measured and squared. Then this process is repeated many times and the results are averaged. Often, two such measurements are performed on the same system in and out of equilibrium (the nonequilibrium state can be obtained by a variety of methods, e.g., by applying a DC voltage or electromagnetic radiation to the sample). The excess noise is defined as the difference in the noise between these two measurements. We find that this excess noise is given by the excess of the non-symmetrized power-spectrum of the current-noise. This result holds for a rather general class of experimental setups.

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