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Physica A Statistical Mechanics and its Applications

Dynamical critical exponent of the one-dimensional random transverse-Ising model

Hitoshi Asakawa

Published Nov 1, 1996• 4 citations
Publisher
DOI
10.1016/s0378-4371(96)00230-0

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We study the quantum phase transition in the two-dimensional random Ising model in a transverse field by Monte Carlo simulations. We find results similar to those known analytically in one dimension. At the critical point the dynamical exponent is infinite and the typical correlation function decays with a stretched exponential dependence on distance. Away from the critical point there are Griffiths-McCoy singularities, characterized by a single continuously varying exponent, ${z}^{\ensuremath{'}}$, which diverges at the critical point, as in one dimension. Consequently, the zero temperature susceptibility diverges for a range of parameters about the transition.