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arXiv 2008.09402cond-mat.quant-gasphysics.comp-ph
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具有三体在位相互作用的扩展Bose-哈伯德模型中的涌现相

Emergent Phases in an Extended Bose-Hubbard Model with Three-body On-site Interaction

Henry Otobrise, Kunle Adegoke

摘要:

研究了具有三体现场相互作用的扩展Bose-哈伯德模型。利用精确对角化方法和变分矩阵乘积态算法\emph{Alps mps-optim},计算和分析了能荷隙和有限系统关联函数,得到了系统的相边界,确定了系统的相和相变。对于\mbox{$\frac{V}{U} = 0.6$}和\mbox{$\frac{W}{U} = 0$},我们观察到在\mbox{$ρ= 1$}电荷密度波(CDW)波瓣的尖端出现了Halcohol绝缘体(HI)相,对于\mbox{$\frac{V}{U} = 0.6$}和\mbox{$\frac{W}{U} = 1$},我们观察到在\mbox{$ρ= 1/2$}电荷密度波(CDW)波瓣的尖端出现了超固体(SS)相。我们还注意到,在填充因子\mbox{$ρ= 2$}的模型的相图上包含三体现场相互作用和最近邻相互作用的效果是稳定Mott绝缘体(MI)相,使得系统对于所有$\frac{V}{U}$值保持在MI相。

英文摘要:

We study the Extended Bose-Hubbard Model with a three-body onsite interaction. Using an exact diagonalization method and a variational Matrix Product States algorithm, \emph{Alps mps-optim}, we compute and analyse the energy charge gap and finite system correlation functions to obtain the phase boundaries and determine the phases and phase transitions of the model. For \mbox{$\frac{V}{U} = 0.6$} and \mbox{$\frac{W}{U} = 0$}, we observed the emergence of the Haldane insulator (HI) phase at the tip of the \mbox{$ρ= 1$} charge density wave (CDW) lobe and for \mbox{$\frac{V}{U} = 0.6$} and \mbox{$\frac{W}{U} = 1$}, we observed the emergence of the supersolid (SS) phase at the tip of the \mbox{$ρ= 1/2$} charge density wave (CDW) lobe. We also noticed that the effect of the inclusion of both the three-body onsite and nearest neighbor interactions on the phase diagram of the model for filling factor \mbox{$ρ= 2$} is to stabilize the Mott insulator (MI) phase such that the system remains in the MI phase for all values of $\frac{V}{U}$.

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