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arXiv 0811.2973cond-mat.str-el
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扩展各向异性铁磁-反铁磁Heisenberg链的phase diagram

The phase diagram of the extended anisotropic ferromagnetic-antiferromagnetic Heisenberg chain

Evgeny Plekhanov, Adolfo Avella, Ferdinando Mancini

摘要:

利用密度矩阵重整化群(DMRG)方法研究了具有铁磁最近邻和反铁磁次近邻相互作用的一维扩展各向异性海森堡模型的相图.我们分析了自旋算符在平面内和平面外的静态关联函数,并根据它们的关联范围对零温相进行了分类。在具有开放边界条件的$64,100,200,300$站点簇上,我们隔离了边界效应,并对我们的结果进行了有限尺寸标度。除了铁磁相,我们确定了两个无隙自旋流体相和两个大规模的激发。基于我们的相图和文献中已知的耦合常数的估计,我们对几种边缘共享材料的基态进行了分类。

英文摘要:

By using Density Matrix Renormalization Group (DMRG) technique we study the phase diagram of 1D extended anisotropic Heisenberg model with ferromagnetic nearest-neighbor and antiferromagnetic next-nearest-neighbor interactions. We analyze the static correlation functions for the spin operators both in- and out-of-plane and classify the zero-temperature phases by the range of their correlations. On clusters of $64,100,200,300$ sites with open boundary conditions we isolate the boundary effects and make finite-size scaling of our results. Apart from the ferromagnetic phase, we identify two gapless spin-fluid phases and two ones with massive excitations. Based on our phase diagram and on estimates for the coupling constants known from literature, we classify the ground states of several edge-sharing materials.

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。

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