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arXiv · 1003.3951

NLIE and finite size effects of the spin-1/2 XXZ and sine-Gordon models with two boundaries revisited

Rajan Murgan
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Abstract

Starting from the T-Q equation of an open integrable spin-1/2 XXZ quantum spin chain with nondiagonal boundary terms, we derive a nonlinear integral equation (NLIE) of the sine-Gordon model on a finite interval. We compute the boundary energy and the Casimir energy for the sine-Gordon model with both left and right boundaries. A relation between the boundary parameters of the continuum model and the lattice model is given. We also present numerical results for the effective central charge of an open spin-1/2 XXZ quantum spin chain which find agreement with our analytical result for the central charge of the sine-Gordon model in the ultraviolet (UV) limit.

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Rajan Murgan. 2010-04-27. NLIE and finite size effects of the spin-1/2 XXZ and sine-Gordon models with two boundaries revisited. https://doi.org/10.1007/s13130-010-0528-2

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