Photo-assisted shot noise in Coulomb interacting systems

Details Photo-assisted shot noise in Coulomb interacting systems Photo-assisted shot noise in Coulomb interacting systems

2007-04-11

arxiv.org/abs/0704.1427v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Proceedings of the 6th Rencontres du Vietnam, Hanoi (2006)

Scientific paper

We consider the fluctuations of the electrical current (shot noise) in the presence of a voltage time-modulation. For a non-interacting metal, it is known that the derivative of the photo-assisted noise has a staircase behavior. In the presence of Coulomb interactions, we show that the photo-assisted noise presents a more complex profile, in particular for the two following systems: 1) a two-dimensional electron gas in the fractional quantum Hall regime for which we have obtained evenly spaced singularities in the noise derivative, with a spacing related to the filling factor and, 2) a carbon nanotube for which a smoothed staircase in the noise derivative is obtained.

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