Non-equilibrium Fluctuation Relations in a Quantum Coherent Conductor
arXiv:0911.3470 · doi:10.1103/PhysRevLett.104.080602
Abstract
We experimentally demonstrate the validity of non-equilibrium fluctuation relations by using a quantum coherent conductor. In equilibrium the fluctuation-dissipation relation leads to the correlation between current and current noise at the conductor, namely, Johnson-Nyqusit relation. When the conductor is voltage-biased so that the non-linear regime is entered, the fluctuation theorem has predicted similar non-equilibrium fluctuation relations, which hold true even when the Onsager-Casmir relations are broken in magnetic fields. Our experiments qualitatively validate the predictions as the first evidence of this theorem in the non-equilibrium quantum regime. In the appendix, we give simple deduction of the higher order correlations between the current and the current noise based on the fluctuation theorem.
4 pages, 4 figures with 1-page appendix.
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