Signatures of critical full counting statistics in a quantum-dot chain

Details Signatures of critical full counting statistics in a quantum-dot chain Signatures of critical full counting statistics in a quantum-dot chain

2009-09-24

arxiv.org/abs/0909.4470v1

Phys. Rev. B 81, 045317 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 7 figures

Scientific paper

10.1103/PhysRevB.81.045317

We consider current shot noise and the full counting statistics in a chain of quantum dots which exhibits a continuous non-equilibrium phase transition as a function of the tunnel couplings of the chain with the electrodes. Using a combination of analytical and numerical methods, we establish that the full counting statistics is conventional away from the phase transition, but becomes, in a well-defined sense, essentially non-Gaussian on the critical line, where the current fluctuations are controlled by the dynamic critical exponent $z$. We find that signatures of the critical full counting statistics persist in quantum-dot chains of finite length.

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