Nonequilibrium characterization of spinodal points using short time dynamics
Although intuitively appealing, the concept of spinodal is rigorously defined only in systems with infinite range interactions mean-field systems. In short-range systems, a pseudospinodal can be defined by extrapolation of metastable measurements, but the point itself is not reachable because it lie...
| Authors: | , , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2009 |
| Country: | Argentina |
| Institution: | Universidad Nacional de La Plata |
| Repository: | SEDICI (UNLP) |
| Language: | English |
| OAI Identifier: | oai:sedici.unlp.edu.ar:10915/129368 |
| Online Access: | http://sedici.unlp.edu.ar/handle/10915/129368 |
| Access Level: | Open access |
| Keyword: | Química Física Spinodal Short time dynamics Monte Carlo Potts and Ising models |
| Summary: | Although intuitively appealing, the concept of spinodal is rigorously defined only in systems with infinite range interactions mean-field systems. In short-range systems, a pseudospinodal can be defined by extrapolation of metastable measurements, but the point itself is not reachable because it lies beyond the metastability limit. In this work we show that a sensible definition of spinodal points can be obtained through the short time dynamical behavior of the system deep inside the metastable phase by looking for a point where the system shows critical behavior. We show that spinodal points obtained by this method agree both with the thermodynamical spinodal point in mean-field systems and with the pseudospinodal point obtained by extrapolation of metaequilibrium behavior in short-range systems. With this definition, a practical determination can be achieved without regard for equilibration issues. |
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