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Proceedings Paper

The noise susceptibility of a coherent conductor
Author(s): J. Gabelli; B. Reulet
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Paper Abstract

The complex ac conductance G(ω0) of a system measures the dynamical response of the current to a small voltage excitation at frequency ω0. It cannot in general be deduced from the only knowledge of the dc I(V ) characteristics. Similarly, we investigate the dynamical response of current noise to an ac excitation, i.e. the in-phase and out-of-phase response of current noise density S(ω) measured at frequency ω. We present a detailed calculation of this new response function χω0 (ω), that we name noise susceptibility, at arbitrary frequencies for a coherent conductor in the scattering matrix formalism. We exemplify the relevance of our calculation by the measurement of the noise susceptibility of a tunnel junction in the quantum regime &barh;ω ~ &barh;ω0> >kBT, which is in remarkable agreement with our theory.

Paper Details

Date Published: 8 June 2007
PDF: 12 pages
Proc. SPIE 6600, Noise and Fluctuations in Circuits, Devices, and Materials, 66000T (8 June 2007); doi: 10.1117/12.724656
Show Author Affiliations
J. Gabelli, Lab. de Physique des Solides, UMR 8502, Univ. Paris-Sud (France)
B. Reulet, Lab. de Physique des Solides, UMR 8502, Univ. Paris-Sud (France)

Published in SPIE Proceedings Vol. 6600:
Noise and Fluctuations in Circuits, Devices, and Materials
Massimo Macucci; Lode K.J. Vandamme; Carmine Ciofi; Michael B. Weissman, Editor(s)

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