Thermodynamics and phase transitions in dissipative and active Morse chains |
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Authors: | Chetverikov A P Ebeling W Velarde M G |
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Institution: | (1) Faculty of Nonlinear Processes, Saratov State University, Astrakhanskaya 83, 410012 Saratov, Russia;(2) Institut für Physik, Humboldt-Universität Berlin, Newtonstrasse 15, 12489 Berlin, Germany;(3) Instituto Pluridisciplinar, Universidad Complutense, Paseo Juan XXIII, 1, 28040 Madrid, Spain |
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Abstract: | We study the evolution of a simple one-dimensional
chain of N=4
particles with Morse interactions and periodic boundary conditions
which are imbedded into a heat bath creating dissipation and noise.
The investigation is concentrated on thermodynamic
properties for equilibrium, near-equilibrium and far-equilibrium
conditions. For the thermodynamic equilibrium, created by white
noise and
passive friction obeying Einstein s fluctuation dissipation
relation, we find a standard phase diagram.
By applying active friction forces
the system is driven to stationary non-equilibrium states,
creating conditions
where various self-sustained oscillations are excited.
Thermodynamic quantities like energy, pressure and entropy are
calculated near equilibrium, around a
critical distance from equilibrium and far from
equilibrium. We observe maximal order (minimum entropy) in certain
region of the noise temperature, a phenomenon which is reminiscent of
stochastic resonance.
With increasing distance from equilibrium new phases
corresponding to the existence of several attractors of the
dynamical stem appear. |
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Keywords: | |
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