准一维海森堡反铁磁自旋系统的数值研究

Numerical Research on Quasi-one-dimensional Heisenberg Antiferromagnetic Spin System

利用数值密度矩阵重整化群方法对一种特殊的准一维海森堡反铁磁自旋系统的基态磁性序问题进行研究,计算了单个晶胞的基态能、自旋关联函数以及自旋能隙。研究表明这种准一维海森堡反铁磁链的基态存在磁性长程序,且链上格点间的自旋关联是短程的。

The magnetic order of a special quasi-one-dimensional Heisenberg antiferromagnetic spin model with numerical density matrix renormalization groups is discussed. The ground energy per unit cell, spin correlation function and the spin gap are calculated. Results show that the quasi-one-dimensional spin system has magnetic long-rang order under ground state and the spin correlation on chain is short-rang.