Nonequilibrium two-dimensional Ising model with stationary uphill diffusion

Physical Review. E
Matteo ColangeliCecilia Vernia

Abstract

Usually, in a nonequilibrium setting, a current brings mass from the highest density regions to the lowest density ones. Although rare, the opposite phenomenon (known as "uphill diffusion") has also been observed in multicomponent systems, where it appears as an artificial effect of the interaction among components. We show here that uphill diffusion can be a substantial effect, i.e., it may occur even in single component systems as a consequence of some external work. To this aim we consider the two-dimensional ferromagnetic Ising model in contact with two reservoirs that fix, at the left and the right boundaries, magnetizations of the same magnitude but of opposite signs.We provide numerical evidence that a class of nonequilibrium steady states exists in which, by tuning the reservoir magnetizations, the current in the system changes from "downhill" to "uphill". Moreover, we also show that, in such nonequilibrium setup, the current vanishes when the reservoir magnetization attains a value approaching, in the large volume limit, the magnetization of the equilibrium dynamics, thus establishing a relation between equilibrium and nonequilibrium properties.

References

Feb 7, 2012·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Alessandra IacobucciGabriel Stoltz
Mar 13, 2015·Chemical Society Reviews·Rajamani Krishna
Oct 1, 2015·Physical Chemistry Chemical Physics : PCCP·Rajamani Krishna

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Citations

Apr 18, 2021·Physical Review. E·Emilio N M CirilloLamberto Rondoni

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