Excitation Spectrum for Quantum Spin Systems with Ladder, Plaquette and Mixed-Spin Structures
强关联电子
2007-05-23 v1
摘要
By using the series expansion techniques, we study the excitation spectrum for the two-dimensional quantum spin systems with ladder, plaquette and mixed-spin structures. We calculate the spin excitation gap and thus determine the phase boundary between the spin-gap phase and the magnetically ordered phase rather precisely. It is found that the phase diagram obtained improves fairly well the one previously obtained via the ground-state susceptibility.
引用
@article{arxiv.cond-mat/9908458,
title = {Excitation Spectrum for Quantum Spin Systems with Ladder, Plaquette and Mixed-Spin Structures},
author = {Akihisa Koga and Norio Kawakami},
journal= {arXiv preprint arXiv:cond-mat/9908458},
year = {2007}
}
备注
9 pages, submitted to Phys. Rev. B