The non-equilibrium steady state of sparse systems with nontrivial topology

Details The non-equilibrium steady state of sparse systems with nontrivial topology The non-equilibrium steady state of sparse systems with nontrivial topology

2011-09-25

arxiv.org/abs/1109.5324v2

Europhysics Letters 98, 20002 (2012)

Physics

Condensed Matter

Statistical Mechanics

6 pages, 4 figures

Scientific paper

We study the steady state of a multiply-connected system that is driven out of equilibrium by a sparse perturbation. The prototype example is an $N$-site ring coupled to a thermal bath, driven by a stationary source that induces transitions with log-wide distributed rates. An induced current arises, which is controlled by the strength of the driving, and an associated topological term appears in the expression for the energy absorption rate. Due to the sparsity, the crossover from linear response to saturation is mediated by an intermediate regime, where the current is exponentially small in $\sqrt{N}$, which is related to the work of Sinai on "random walk in a random environment".

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