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arXiv 1504.01565cond-mat.stat-mech
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棋盘格点上相互作用单体-二聚体模型的Kosterlitz-numerless跃迁和phase diagrams

Kosterlitz-Thouless transitions and phase diagrams of the interacting monomer-dimer model on a checkerboard lattice

Sazi Li, Wei Li, Ziyu Chen

摘要:

使用张量网络方法,我们研究了棋盘格点上的单-二聚体模型,其中有一半的格子上的平行二聚体之间存在相互作用(强度为$ν$)。对于完全填充的相互作用二聚体模型,我们观察到了低温对称破缺和高温临界相之间的Kosterlitz-numerless(KT)相变;对于掺杂的具有有限化学势$μ$的二聚体模型,我们也观察到了有序-无序相变,而不是二级相变.我们用边界矩阵积态方法检测了KT和二级相变,得到了$ν-T$和$μ-T$相图。此外,对于非相互作用的单体-二聚体模型(设置$μ= ν= 0$),我们得到了一个非常准确的测定单位自由能(负的单体-二聚体常数$h_2$)作为$f=-0.662\, 798\, 972\, 833\, 746$与二聚体密度$n=0.638\, 123\, 109\, 228\, 547$,都是15个正确的数字。

英文摘要:

Using the tensor network approach, we investigate the monomer-dimer models on a checkerboard lattice, in which there are interactions (with strength $ν$) between the parallel dimers on half of the plaquettes. For the fully packed interacting dimer model, we observe a Kosterlitz-Thouless (KT) transition between the lowtemperature symmetry breaking and the high-temperature critical phases; for the doped monomer-dimer casewith finite chemical potential $μ$, we also find an order-disorder phase transition which is of second order instead. We use the boundary matrix product state approach to detect the KT and second-order phase transitions and obtain the phase diagrams $ν-T$ and $μ-T$ . Moreover, for the noninteracting monomer-dimer model (setting $μ= ν= 0$), we get an extraordinarily accurate determination of the free energy per site (negative of the monomer-dimer constant $h_2$) as $f=-0.662\, 798\, 972\, 833\, 746$ with the dimer density $n=0.638\, 123\, 109\, 228\, 547$, both of 15 correct digits.

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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