arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1112.6325cond-mat.str-el
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含Anderson-Hubbard中心的系统中金属-绝缘体转变的相图

Phase Diagram of Metal-Insulator Transition in System with Anderson-Hubbard Centers

Yuriy Skorenkyy, Leonid Didukh, Oleksandr Kramar, Yuriy Dovhopyaty

AI总结:

该研究构建了含周期Anderson-Hubbard中心的窄带金属强关联模型,考虑杂化、晶格形变等因素,推导Green函数与转变判据,得到金属-绝缘体转变的相图。

摘要:

本文研究了一种强关联系统模型:将周期排布的Anderson-Hubbard中心引入窄带金属中。除局域磁矩间的相互作用与强在位库仑相互作用外,该模型还考虑了局域态与能带态的杂化。为研究晶格形变对系统电性质的影响,模型纳入了声子项与弹性能。本文推导了能带电子与局域电子的Green函数,在此基础上探究了能谱随模型参数、温度及外压的变化关系,推导了电子浓度为整数时的金属-绝缘体转变判据,并构建了金属-绝缘体转变的相图。

英文摘要:

The model of a strongly correlated system in which periodically spaced Anderson-Hubbard centers are introduced into narrow-band metal is considered. Besides the interactions between localized magnetic moments and strong on-site Coulomb interaction, the model takes into account the hybridization of localized and band states. To study the efect of the lattice deformation on the electrical properties of the system the phonon term and elastic energy have been taken into account. Green functions for band and localized electrons have been found. On this base, the energy spectrum has been investigated as function of model parameters, temperature and external pressure. The criterion of metal-insulator transition for integer value of electron concentration has been derived and the phase diagram of the metal-insulator transition has been built.

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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