摘要
在投影量子Monte Carll方法基础上,提出了一种有效地处理反铁磁自旋长链的Monte Carlo方法。用该算法计算了自旋S=1/2、链长N=32的反铁磁链的基态能。计算结果与Betsuyaku和Bonner等人的结果相符合。同时,计算了反铁磁链的基态关联函数,得出了随链长N的增加,其自旋链的长程有序消失的结论。
Based on the projector quantum Monte Carlo method, the paper presents an effective Monte Carlo arithmetic that processes the antiferromagnetic long chains. By using this arithmetic, the ground state ennrgy of the spin-1/2 antiferromagnetic chains with length N=32 is calculated, the result shows that the calculated value or the ground state energy is in good agreement with that obtained by Betsuyaku and Bonner et al. The ground state correlation functions of antiferromagnetic chains are also studied, and the result that Longrange-order disappears as chain length increases is obtained.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
1992年第6期647-651,共5页
Journal of University of Electronic Science and Technology of China
关键词
反铁磁自旋链
投影量子
基态能
antiferromagnetic spin chain
projector quantum
Monte Carlo method
ground state correlation function
Long-range-order
ground state energy
