Dynamics of Quantum Noise in a Tunnel Junction under ac Excitation

Details Dynamics of Quantum Noise in a Tunnel Junction under ac Excitation Dynamics of Quantum Noise in a Tunnel Junction under ac Excitation

2007-05-17

arxiv.org/abs/0705.2573v2

Phys. Rev. Lett. 100, 026601 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Theory removed. More experimental details. One extra figure

Scientific paper

10.1103/PhysRevLett.100.026601

We report the first measurement of the \emph{dynamical response} of shot noise (measured at frequency $\omega$) of a tunnel junction to an ac excitation at frequency $\omega_0$. The experiment is performed in the quantum regime, $\hbar\omega\sim\hbar\omega_0\gg k_BT$ at very low temperature T=35mK and high frequency $\omega_0/2\pi=6.2$ 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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