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arXiv 2104.07048cond-mat.str-elcond-mat.quant-gas
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质量不平衡的一维排斥哈伯德模型:序和填充反常

One-dimensional repulsive Hubbard model with mass imbalance: Orders and filling anomaly

Yuchi He, David Pekker, Roger S. K. Mong

摘要:

本文研究了具有质量不平衡的一维排斥哈伯德模型的相图。使用DMRG,我们表明,该模型有一个“三重”配对阶段(称为$π\mathrm{SG}$)在通用的填充,与以前的理论分析一致。我们研究了$π\mathrm{SG}$相的拓扑结构,确定了长程弦序和填充异常,它是指单粒子能隙、反转对称性和开链填充不平衡之间的关系。我们还发现,使用DMRG,在$1/3$填充,相称的效果导致两个额外的阶段:一个晶体相和trion相,我们构建了一个描述这些阶段使用Tomonaga-Luttinger液体理论。

英文摘要:

We investigate the phase diagram of the one-dimensional repulsive Hubbard model with mass imbalance. Using DMRG, we show that this model has a "triplet" paired phase (dubbed $π\mathrm{SG}$) at generic fillings, consistent with previous theoretical analysis. We study the topological aspect of $π\mathrm{SG}$ phase, determining long-range string orders and the filling anomaly which refers to the relation among the single particle gap, inversion symmetry, and filling imbalance for open chains. We also find, using DMRG, that at $1/3$ filling, commensurate effects lead to two additional phases: a crystal phase and a trion phase; we construct a description of these phases using Tomonaga-Luttinger liquid theory.

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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