The noise susceptibility of a coherent conductor

J. Gabelli; B. Reulet

doi:10.1117/12.724656

8 June 2007 The noise susceptibility of a coherent conductor

J. Gabelli, B. Reulet

Proceedings Volume 6600, Noise and Fluctuations in Circuits, Devices, and Materials; 66000T (2007) https://doi.org/10.1117/12.724656
Event: SPIE Fourth International Symposium on Fluctuations and Noise, 2007, Florence, Italy

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 χ_ω0 (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> >k_BT, which is in remarkable agreement with our theory.

Citation Download Citation

J. Gabelli and B. Reulet "The noise susceptibility of a coherent conductor", Proc. SPIE 6600, Noise and Fluctuations in Circuits, Devices, and Materials, 66000T (8 June 2007); https://doi.org/10.1117/12.724656

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