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Phys Rev E. 2019 Jan;99(1-1):012129. doi: 10.1103/PhysRevE.99.012129.

Fluctuation theorem with two independent field parameters: The one-dimensional compressible Ising model.

Author information

1
Departamento de Física, Universidade Federal de Santa Catarina, Campus Universitário, Trindade, 88040-900, Florianópolis, Santa Catarina, Brazil.
2
Departamento de Física, I3N, Universidade de Aveiro, 3810-193, Aveiro, Portugal.
3
Departamento de Física, Universidade Federal de Santa Catarina, Campus Universitário, Trindade, 88040-900, Florianópolis, Santa Catarina, Brazil and Instituto de Física, Universidade de São Paulo, Rua do Matão, 1371, 05508-090 São Paulo, São Paulo, Brazil.

Abstract

In this work we consider the nonequilibrium mechanical and magnetic work performed on a one-dimensional compressible Ising model. In the harmonic approximation we easily integrate the mechanical degrees of freedom of the model, and the resulting effective Hamiltonian depends on two external parameters, the magnetic field and the force applied along the chain. As the model is exactly soluble in one dimension we can determine the free energy difference between two arbitrary thermodynamic states of the system. We show the validity of the Jarzynski equality, which relates the free energy difference between two thermodynamic states of the system and the average work performed by external agents in a finite time, through nonequilibrium paths between the same thermodynamic states. We have found that the Jarzynski theorem remains valid for all the values of the rate of variation of the magnetic field and the mechanical force applied to the system.

PMID:
30780247
DOI:
10.1103/PhysRevE.99.012129

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