Getting more from pushing less: Negative specific heat and conductivity in nonequilibrium steady states

@article{Zia2001GettingMF,
  title={Getting more from pushing less: Negative specific heat and conductivity in nonequilibrium steady states},
  author={Royce K. P. Zia and Eigil Praestgaard and Ole G. Mouritsen},
  journal={American Journal of Physics},
  year={2001},
  volume={70},
  pages={384-392}
}
For students familiar with equilibrium statistical mechanics, the notion of a positive specific heat, being intimately related to the idea of stability, is both intuitively reasonable and mathematically provable. However, for systems in nonequilibrium stationary states, coupled to more than one energy reservoir, a negative specific heat is entirely possible. We present a minimal system that displays this phenomenon. For a system in contact with two thermal baths at different temperatures, the… 

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References

SHOWING 1-10 OF 16 REFERENCES

Nonequilibrium steady states of stochastic lattice gas models of fast ionic conductors

We investigate theoretically and via computer simulation the stationary nonequilibrium states of a stochastic lattice gas under the influence of a uniform external fieldE. The effect of the field is

A lattice gas coupled to two thermal reservoirs: Monte Carlo and field theoretic studies

Abstract:We investigate the collective behavior of an Ising lattice gas, driven to non-equilibrium steady states by being coupled to two thermal baths. Monte Carlo methods are applied to a

Phase transitions and steady-state microstructures in a two-temperature lattice-gas model with mobile active impurities

  • HenriksenSabraMouritsen
  • Physics, Materials Science
    Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
  • 2000
The nonequilibrium, steady-state phase transitions and the structure of the different phases of a two-dimensional system with two thermodynamic temperatures are studied via a simple lattice-gas model

Phase transitions in stationary nonequilibrium states of model lattice systems

We investigated the stationary nonequilibrium states of a lattice gas of interacting particles subject to an external field $\stackrel{\ensuremath{\rightarrow}}{E}$. The dynamics of the system are

Phase transitions and critical phenomena

  • D. Landau
  • Physics
    Computing in Science & Engineering
  • 1999
The examination of phase transitions and critical phenomena has dominated statistical physics for the latter half of this century--there is a great theoretical challenge in solving special

Non-equilibrium physics: Freezing by heating

An unexpected transition from a fluid state to a frozen state can be achieved in a non-equilibrium system by increasing the level of noise (or temperature) of the system. Such transitions may apply

Equation of state calculations by fast computing machines

A general method, suitable for fast computing machines, for investigating such properties as equations of state for substances consisting of interacting individual molecules is described. The method

Finite-Size Scaling in a Two-Temperature Lattice Gas: A Monte Carlo Study of Critical Properties

We present computer studies of the critical properties of an Ising lattice gas driven to a non-equilibrium steady state by coupling to two temperature baths. Anisotropic scaling, a dominant feature