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arXiv 1111.1119cond-mat.str-el
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一维离子哈伯德模型的相变和光谱性质

Phase transitions and spectral properties of the ionic Hubbard model in one dimension

Ara Go, Gun Sang Jeon

摘要:

本文研究了零温半填充时的离子哈伯德模型。我们将胞腔动力学平均场论应用于一维离子哈伯德模型,计算了双占据率和交错电荷密度等局域量。这两个量提供了一般的过渡行为的模型从带绝缘相到莫特绝缘相。重整化带隙作为一个有效的序参量从带绝缘体的转变。我们还提出了离子哈伯德模型,表现出的特征功能,为弱和强相互作用的光谱特性。

英文摘要:

The ionic Hubbard model is investigated at half filling at zero temperature. We apply the cellular dynamical mean-field theory to the one-dimensional ionic Hubbard model to compute local quantities such as double occupancy and staggered charge density. Both quantities provide general transition behavior of the model from a band insulating phase to a Mott insulating phase. The renormalized band gap is introduced as an efficient order parameter for the transition from a band insulator. We also present the spectral properties of the ionic Hubbard model, which exhibit characteristic features for both weak and strong interactions.

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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