Dynamics of quantum noise in a tunnel junction under ac excitation.
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.
Gabelli
J
J
Laboratoire de Physique des Solides, UMR8502, bâtiment 510, Université Paris-Sud, 91405 ORSAY Cedex, France.
Reulet
B
B