Temperature dependent third cumulant of tunneling noise

Details Temperature dependent third cumulant of tunneling noise Temperature dependent third cumulant of tunneling noise

2003-01-24

arxiv.org/abs/cond-mat/0301476v1

Phys.Rev.Lett. 90, 176802 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages including 2 figures

Scientific paper

10.1103/PhysRevLett.90.176802

Poisson statistics predicts that the shot noise in a tunnel junction has a temperature independent third cumulant e^2\I, determined solely by the mean current I. Experimental data, however, show a puzzling temperature dependence. We demonstrate theoretically that the third cumulant becomes strongly temperature dependent and may even change sign as a result of feedback from the electromagnetic environment. In the limit of a noninvasive (zero-impedance) measurement circuit in thermal equilibrium with the junction, we find that the third cumulant crosses over from e^2/I at low temperatures to -e^2/I at high temperatures.

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