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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Symmetry-based approach to ground-state properties of the one-dimensional negative-U Bose-Hubbard trimer model
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Symmetry-based approach to ground-state properties of the one-dimensional negative-U Bose-Hubbard trimer model

机译：一维负U Bose-Hubbard三聚体模型基于对称性的基态特性方法

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摘要

It is shown that the ground state of the one-dimensional negative-U three-site Bose-Hubbard (trimer) model with periodic (boundary) condition or for a closed chain can be solved almost exactly within a small symmetric subspace with a few boson-trines through an analysis of the percentage of the boson-trines in the ground state. It is also shown that there is a sudden increase of the boson-trine content of the ground state near the critical point of the quantum phase transition, which may be used as an effective order parameter to study the phase transition of the model. The ground-state energy per particle and the entanglement measure with the variation of the control parameter are also analyzed to show their transitional behavior.
机译：结果表明，具有周期（边界）条件或封闭链的一维负U三点Bose-Hubbard（三聚体）模型的基态几乎可以在带有几个玻色子的小对称子空间中几乎完全求解-通过分析基态中玻色子-trines的百分比来获得-trines。还表明，在量子相变的临界点附近，基态的玻色碱含量突然增加，这可以用作研究模型相变的有效阶次参数。还分析了每个粒子的基态能量和随控制参数变化的纠缠度，以显示它们的过渡行为。

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