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Boundary and finite-size effects in lattice models for dynamical phase transitions

D ben-Avraham

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The author studies finite-size effects in lattice models for dynamical phase transitions. For the Ziff-Gulari-Barshad (ZGB) model on the Cayley tree, it is shown that the order of the transition from the reactive phase to the monomer-saturated phase depends upon the adsorption rule for dimers at the boundary. He also examines the ZGB model on finite-sized square lattices connected by a single bond. The finite-size effects associated with the first-order and the second-order transitions are markedly different. This phenomenon can be exploited to determine the order of phase transitions numerically, with modest computing requirements. His findings emphasize the importance of finite-size effects and geometrical constraints in dynamical lattice models. They also help explain the puzzling difference between the behaviour of the ZGB model on percolation clusters and on the Sierpinski gasket.


PACS

64.60.A- Specific approaches applied to studies of phase transitions

05.50.+q Lattice theory and statistics (Ising, Potts, etc.)

MSC

82C43 Time-dependent percolation (See also 60K35)

82C26 Dynamic and nonequilibrium phase transitions (general)

82C20 Dynamic lattice systems (kinetic Ising, etc.) and systems on graphs

Subjects

Condensed matter: structural, mechanical & thermal

Statistical physics and nonlinear systems

Dates

Issue 15 (7 August 1993)



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