Numerical study of the one-dimensional quantum compass model
Numerical study of the one-dimensional quantum compass model
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DOI：
10.1140/epjb/e2010-00255-6
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发表时间：
2010-09-01
影响因子：
1.6
通讯作者：
Mahdavifar, S.
中科院分区：
文献类型：
--
作者：
Mahdavifar, S.
用数值Lanczos方法研究了一维量子罗盘模型(QCM)的基态磁相图。对低能激发谱进行了详细的数值分析。计算了有限链的能隙和自旋-自旋关联函数。在基态相图中，确定了N、EL和一种条状反铁磁体两种长程磁序。在数值分析的基础上，确定了基态相图中的一级和二级量子相变。
The ground state magnetic phase diagram of the one-dimensional quantum compass model (QCM) is studied using the numerical Lanczos method. A detailed numerical analysis of the low energy excitation spectrum is presented. The energy gap and the spin-spin correlation functions are calculated for finite chains. Two kind of the magnetic long-range orders, the N,el and a type of the stripe-antiferromagnet, in the ground state phase diagram are identified. Based on the numerical analysis, the first and second order quantum phase transitions in the ground state phase diagram are identified.