Phys. Rev. Lett. 100, 026601 (2008) [4 pages]Dynamics of Quantum Noise in a Tunnel Junction under ac ExcitationReceived 18 May 2007; published 16 January 2008 We report the first measurement of the dynamical response of shot noise (measured at frequency ω) of a tunnel junction to an ac excitation at frequency ω0. The experiment is performed in the quantum regime, ℏω∼ℏω0≫kBT at very low temperature T=35 mK and high frequency ω0/2π=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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.026601
DOI:
10.1103/PhysRevLett.100.026601
PACS:
72.70.+m, 05.40.−a, 42.50.Lc, 73.23.−b
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