Application of a continous time cluster algorithm to the Two-dimensional Random Quantum Ising Ferromagnet

Details Application of a continous time cluster algorithm to the Two-dimensional Random Quantum Ising Ferromagnet Application of a continous time cluster algorithm to the Two-dimensional Random Quantum Ising Ferromagnet

1998-02-10

arxiv.org/abs/cond-mat/9802104v1

Europ. Phys. J. B 9, 233 (1999)

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages RevTeX, 3 eps-figures included

Scientific paper

A cluster algorithm formulated in continuous (imaginary) time is presented for Ising models in a transverse field. It works directly with an infinite number of time-slices in the imaginary time direction, avoiding the necessity to take this limit explicitly. The algorithm is tested at the zero-temperature critical point of the pure two-dimensional (2d) transverse Ising model. Then it is applied to the 2d Ising ferromagnet with random bonds and transverse fields, for which the phase diagram is determined. Finite size scaling at the quantum critical point as well as the study of the quantum Griffiths-McCoy phase indicate that the dynamical critical exponent is infinite as in 1d.

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