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arXiv 0802.0991cond-mat.str-el
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双通道费米子-玻色子模型中的关联诱导金属绝缘体相变

Correlation-induced metal insulator transition in a two-channel fermion-boson model

G. Wellein, H. Fehske, A. Alvermann, D. M. Edwards

摘要:

我们通过一个有效的晶格模型和一种新的费米子-玻色子耦合形式研究了背景介质中的电荷输运。玻色子描述了相关背景的涨落。通过分析该输运模型的基态和光谱性质,我们证明了在半充满带的情况下,金属-绝缘体量子相变是如何发生的。我们讨论了在绝缘相的质量不对称能带结构的演变,并建立连接到莫特和佩尔斯过渡的情况。

英文摘要:

We investigate charge transport within some background medium by means of an effective lattice model with a novel form of fermion-boson coupling. The bosons describe fluctuations of a correlated background. By analyzing groundstate and spectral properties of this transport model, we show how a metal-insulator quantum phase transition can occur for the half-filled band case. We discuss the evolution of a mass-asymmetric band structure in the insulating phase and establish connections to the Mott and Peierls transition scenarios.

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