Quantum Phase Transition of S=1/2 Trimerized XXZ Spin Chain in Magnetic Field
Abstract
We study the magnetization plateau at a third of the saturation magnetization of the S=1/2 trimerized XXZ spin chain at T=0. The appearance of the plateau depends on the values of the XXZ anisotropy and the magnitude of the trimerization. This plateauful-plateauless transition is a quantum phase transition of the Berezinskii-Kosterlitz-Thouless type, which is difficult to precisely detect from the numerical data. To determine the phase boundary line of this transition precisely, we use the level crossing of low-lying excitations obtained from the numerical diagonalization. We also discuss the S=1/2 ferromagnetic-ferromagnetic-antiferromagnetic chain.
Keywords
Cite
@article{arxiv.cond-mat/9907481,
title = {Quantum Phase Transition of S=1/2 Trimerized XXZ Spin Chain in Magnetic Field},
author = {Kiyomi Okamoto and Atsuhiro Kitazawa},
journal= {arXiv preprint arXiv:cond-mat/9907481},
year = {2009}
}
Comments
LaTeX2e, 4 pages, 2eps figures, submitted to conference on Strongly Correlated Electron Systems