arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1306.5244cond-mat.str-elcond-mat.dis-nn
收藏

无序电荷转移模型中的Mott-Anderson相变:典型介质理论的启示

Mott-Anderson transition in disordered charge transfer model: insights from typical medium theory

W. S. Oliveira, M. C. O. Aguiar, V. Dobrosavljevic

摘要:

最近的大规模计算(统计动力学平均场论)研究表明,与无序单带哈伯德模型相比,无序电荷转移模型中的Mott-Anderson跃迁显示出几个新的特征。在这里,我们表明,一个简单得多的典型介质理论方法(TMT-DMFT)相同的模型是能够捕捉最定性,甚至定量方面的相图,出现一个中间电子格里菲斯阶段,和临界行为接近的金属-绝缘体过渡。因此,TMT-DMFT公式的概念和数学上的简单性使得有可能获得有用的新的洞察这些模型中的Mott-Anderson转变的机制。

英文摘要:

The Mott-Anderson transition in the disordered charge-transfer model displays several new features in comparison to what is found in the disordered single-band Hubbard model, as recently demonstrated by large-scale computational (statistical dynamical mean field theory) studies. Here we show that a much simpler typical medium theory approach (TMT-DMFT) to the same model is able to capture most qualitative and even quantitative aspects of the phase diagram, the emergence of an intermediate electronic Griffiths phase, and the critical behavior close to the metal-insulator transition. Conceptual and mathematical simplicity of the TMT-DMFT formulation thus makes it possible to gain useful new insight into the mechanism of the Mott-Anderson transition in these models.

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。

↑