arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2501.07541cond-mat.str-el
收藏

二维周期性 Anderson 模型的磁性相

Magnetic phases of the periodic Anderson model in two dimensions

Imre Hagymási

AI总结:

本研究利用 iPEPS 技术准确确定了二维周期性 Anderson 模型在不同填充下的磁性基态,揭示了量子涨落效应,并发现半填充时相变与 QMC 一致,在 $n=1.5$ 时确定了新型反铁磁对角条纹基态。

摘要:

我们研究了正方晶格上周期性 Anderson 模型在不同能带填充下的基态性质。采用无限投影纠缠对态(iPEPS)技术,我们能够准确确定磁性基态,并将其与平均场预测进行比较,以突出量子涨落效应。在半填充时,我们分析了反铁磁与顺磁(Kondo 单态)相之间随杂化和 $f$ 能级能量变化的转变,发现在杂化情况下与现有量子蒙特卡罗研究结果高度一致。对于每格点 $n = 1.5$ 个电子,我们确定了一种新型关联反铁磁对角条纹相为基态,该相与其铁磁伴生态竞争。

英文摘要:

We investigate the ground-state properties of the periodic Anderson model on the square lattice across various band fillings. Employing the infinite projected entangled-pair states (iPEPS) technique, we can determine the magnetic ground states accurately and compare them to mean-field predictions to highlight the effects of quantum fluctuations. At half-filling, we analyze the transition between the antiferromagnetic and paramagnetic (Kondo singlet) phases as a function of hybridization and $f$-level energy, finding excellent agreement with existing quantum Monte Carlo studies in the case of hybridization. For $n = 1.5$ electrons per site, we identify a novel correlated antiferromagnetic diagonal stripe phase as the ground state, which competes with its ferromagnetic partner state.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑