Phase transition in the transverse Ising model using the extended coupled-cluster method

Details Phase transition in the transverse Ising model using the extended coupled-cluster method Phase transition in the transverse Ising model using the extended coupled-cluster method

1999-11-23

arxiv.org/abs/cond-mat/9911365v1

Phys. Rev. B 62 (2000) 308

Physics

Condensed Matter

10 pages, 7 eps-figures

Scientific paper

10.1103/PhysRevB.62.308

The phase transition present in the linear-chain and square-lattice cases of the transverse Ising model is examined. The extended coupled cluster method (ECCM) can describe both sides of the phase transition with a unified approach. The correlation length and the excitation energy are determined. We demonstrate the ability of the ECCM to use both the weak- and the strong-coupling starting state in a unified approach for the study of critical behavior.

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