Excitation Spectrum at the Yang-Lee Edge Singularity of the 2D Ising model

Tomasz Wydro, John F. McCabe

Published 2005-10-07Version 1

This paper studies the Yang-Lee edge singularity of 2-dimensional 2D Ising model through a quantum spin chain. In particular, finite-size scaling measurements on the quantum spin chain are used to determine the low-lying excitation spectrum and central charge at the Yang-Lee edge singularity. The measured values are consistent with predictions for the (A4, A1) minimal conformal field theory.