Low Temperature Behavior and Crossovers of the Square Lattice Quantum Heisenberg Antiferromagnet
Low Temperature Behavior and Crossovers of the Square Lattice Quantum Heisenberg Antiferromagnet
复制标题
方晶格量子海森堡反铁磁体的低温行为和交叉
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
M. Troyer
中科院分区：
文献类型：
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作者：
Jae;M. Troyer
用量子蒙特卡罗方法测量了正方形晶格上S=1/2各向同性量子反铁磁体的各种物理量的热力学测量。特别是，我们已经测量了均匀磁化率的无限大体积极限，直到逆温度β=40，对它的分析揭示了正确的渐近行为，与手征微扰理论的预测非常一致。关于存在从量子临界状态到重整化经典状态的交叉的争论得到了解决。
We present thermodynamic measurements of various physical observables of the two dimensional S=1/2 isotropic quantum Heisenberg antiferromagnet on a square lattice, obtained by quantum Monte Carlo. In particular we have been able to measure the infinite volume limit of the uniform susceptibility up to the inverse temperature beta=40, the analysis of which reveals the correct asymptotic behavior in excellent agreement with the prediction of chiral perturbation theory. The controversy over the existence of a crossover from quantum critical to renormalized classical regime is resolved.