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arXiv 1012.1031cond-mat.str-elcond-mat.dis-nn
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Anderson-哈伯德模型中无序引起的零偏异常分析

Analysis of the Disorder-Induced Zero Bias Anomaly in the Anderson-Hubbard Model

Hong-Yi Chen, R. Wortis, W. A. Atkinson

摘要:

采用数值计算和解析计算相结合的方法,研究了由二维Anderson-哈伯德模型模拟的强关联系统态密度中的无序诱导零偏异常(ZBA).我们发现,ZBA来自于响应的非局部非弹性自能的无序势,这一结果具有影响的理论方法,只保留本地自能。利用自能的近似解析形式,导出了二格点Anderson-哈伯德模型的态密度表达式。我们的形式再现的ZBA的基本特征,即宽度是成比例的跳跃幅度$t$,是独立的相互作用强度和无序势。

英文摘要:

Using a combination of numerical and analytical calculations, we study the disorder-induced zero bias anomaly (ZBA) in the density of states of strongly-correlated systems modeled by the two dimensional Anderson-Hubbard model. We find that the ZBA comes from the response of the nonlocal inelastic self-energy to the disorder potential, a result which has implications for theoretical approaches that retain only the local self-energy. Using an approximate analytic form for the self-energy, we derive an expression for the density of states of the two-site Anderson-Hubbard model. Our formalism reproduces the essential features of the ZBA, namely that the width is proportional to the hopping amplitude $t$ and is independent of the interaction strength and disorder potential.

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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