具有量子声子的海森堡自旋-佩尔氏模型的相图
凝聚态物理
2009-10-31 v2
摘要
我们采用新版密度矩阵重正则群方法，确定了反铁磁海森堡自旋链中自旋与量子声子相互作用的模型相图。自旋-声子耦合为非零值时，出现从无能隙自旋流态向有能隙二聚体化相的量子相变。该相变属于与受扰乱自旋链相同的普适类，而该模型在反绝热极限下可映射到该自旋链。我们认为，实际建模已知自旋-佩尔氏材料时，必须包含量子声子的效应。
关键词
引用
@article{arxiv.cond-mat/9812409,
title = {Phase diagram of a Heisenberg spin-Peierls model with quantum phonons},
author = {Robert J. Bursill and Ross H. McKenzie and Chris J. Hamer},
journal= {arXiv preprint arXiv:cond-mat/9812409},
year = {2009}
}
备注
RevTeX, 5 pages, 3 eps figures included using epsf. Improved theories in adiabatic and non-adiabatic regimes give better agreement with DMRG. This version accepted in Physical Review Letters