Observation of Quantum Oscillations in the Photo-assisted Shot Noise of a Tunnel Junction
Abstract
We report measurements of the low frequency current fluctuations of a tunnel junction placed at very low temperature biased by a time-dependent voltage V(t)=V(1+ 2π t). We observe that the excess noise generated by the ac excitation exhibits quantum oscillations as a function of the dc bias, with a period given by h/e with e the charge of a single electron. This is a direct consequence of the quantum nature of electricity in a normal conductor.
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