Dynamics of quantum noise in a tunnel junction under ac excitation |
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Authors: | Gabelli J Reulet B |
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Affiliation: | Laboratoire de Physique des Solides, UMR8502, batiment 510, Université Paris-Sud, 91405 ORSAY Cedex, France. |
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Abstract: | We report the first measurement of the dynamical response of shot noise (measured at frequency omega) of a tunnel junction to an ac excitation at frequency omega0. The experiment is performed in the quantum regime, variant Planck's over 2piomega approximately variant Planck's over 2piomega0>kBT at very low temperature T=35 mK and high frequency omega0/2pi=6.2 GHz. We observe that the noise responds in phase with the excitation, but not adiabatically. The results are in very good agreement with a prediction based on a new current-current correlator. |
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