Correlated electrons in the presence of disorder
Correlated electrons in the presence of disorder
复制标题
无序存在时的相关电子
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
D. Vollhardt
中科院分区：
文献类型：
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作者：
K. Byczuk;W. Hofstetter;U. Yu;D. Vollhardt
抽象。
电子关联和无序之间的微妙的相互作用的几个新的方面进行了审查。首先，动力学平均场理论（DMFT）与几何平均（“典型”）的局域态密度一起被用来计算Anderson-Hubbard模型在半填充时的基态相图。这种非微扰方法在单粒子水平上对安德森局域化敏感，因此可以检测到相关的金属相、Mott绝缘相和安德森绝缘相，也可以描述安德森局域化与反铁磁性之间的竞争。其次，我们研究了二元合金无序对含f电子材料铁磁性的影响，该材料由周期安德森模型描述。居里温度Tc的急剧增强所造成的增加的局部f-矩在无序的导电电子的存在下被发现和解释。
Abstract.
Several new aspects of the subtle interplay between electronic correlations and disorder are reviewed. First, the dynamical mean-field theory (DMFT) together with the geometrically averaged (“typical”) local density of states is employed to compute the ground state phase diagram of the Anderson-Hubbard model at half-filling. This non-perturbative approach is sensitive to Anderson localization on the one-particle level and hence can detect correlated metallic, Mott insulating and Anderson insulating phases and can also describe the competition between Anderson localization and antiferromagnetism. Second, we investigate the effect of binary alloy disorder on ferromagnetism in materials with f-electrons described by the periodic Anderson model. A drastic enhancement of the Curie temperature Tc caused by an increase of the local f-moments in the presence of disordered conduction electrons is discovered and explained.