THE STEADY STATE OF THE TAPPED ISING MODEL

David S. Dean and Alexandre Lefevre
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David S. Dean: IRSAMC, Laboratoire de Physique Quantique, Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex 04, France
Alexandre Lefevre: IRSAMC, Laboratoire de Physique Quantique, Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex 04, France

Advances in Complex Systems (ACS), 2001, vol. 04, issue 04, 333-343

Abstract: We consider a tapping dynamics, analogous to that in experiments on granular media, on the simple one-dimensional ferromagnetic Ising model. When unperturbed, the system undergoes a single spin flip falling dynamics where only energy lowering moves occur. With this dynamics the system has an exponentially large number of metastable states and gets stuck in blocked or jammed configurations as do granular media. When stuck, the system is tapped, in order to make it evolve, by flipping in parallel each spin with probabilityp(corresponding to the strength of the tapping). Under this dynamics the system reaches a steady state regime characterized by an asymptotic energy per spinE(p), which is determined analytically. Within the steady state regime we compare certain time averaged quantities with the ensemble average of Edwards based on a canonical measure over metastable states of fixed average energy. The ensemble average yields results in excellent agreement with the dynamical measurements.

Keywords: Dense granular media; Ising model; tapping; thermodynamics (search for similar items in EconPapers)
Date: 2001
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DOI: 10.1142/S0219525901000255

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