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arXiv 1809.01258cond-mat.str-el
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Haldane-Hubbard-Coulomb模型的Phase diagram拓扑

Phase diagram topology of the Haldane-Hubbard-Coulomb model

Igor S. Tupitsyn, Nikolay V. Prokof'ev

摘要:

本文研究了具有手征相$ϕ= π/2$的自旋- $1/2$ Haldinger相互作用模型在半填充时的相图。同时考虑了在位和长程库仑排斥作用(Haldane-Hubbard-Coulomb模型)。现场相互作用$U$单独的问题是解决在过去的各种近似和有限尺寸的方法,产生的结果在定量和定性上彼此不一致。在这里,我们采用的Diagrammatic Monte Carlo技术,以准确地定位相变点的拓扑非平凡的相位在$(Δ, U)$平面,其中$\pm Δ$是反演对称性破缺的现场能量,并建立自能的动量依赖不能被忽略在适当的处理。我们还发现,即使是温和的长程相互作用,通常在理论上的考虑,导致显着的转变线。

英文摘要:

We study the phase diagram of the interacting spin-$1/2$ Haldane model with chiral phase $ϕ= π/2$ at half-filling. Both on-site and long-range Coulomb repulsive interactions (Haldane-Hubbard-Coulomb model) are considered. The problem with on-site interaction $U$ alone was addressed in the past by a variety of approximate and finite size methods that produced results in disagreement with each other both quantitatively and qualitatively. Here we employ the Diagrammatic Monte Carlo technique to accurately locate phase transition points to the topologically nontrivial phases in the $(Δ, U)$-plane, where $\pm Δ$ is the inversion symmetry breaking on-site energy, and establish that momentum dependence of self-energy cannot be neglected in the proper treatment. We also find that even modest long-range interactions, typically discarded in theoretical considerations, result in significant shifts of transition lines.

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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