Excitation spectrum at the Yang-Lee edge singularity of the 2D Ising model

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 axe consistent with predictions for the (A(4), A(1)) minimal conformal field theory.