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arXiv 0810.1078cond-mat.str-el
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阻挫晶格上的强关联电子

Strongly correlated electrons on frustrated lattices

Peter Fulde, Frank Pollmann, Erich Runge

摘要:

本文综述了几何阻挫晶格上强关联电子电荷自由度的研究进展。特别注意棋盘格,即,烧绿石晶格的二维版本和戈薇晶格。对于棋盘格,它表明,在半填充时,自旋自由度被忽略和四分之一填充时,它们包括与分数电荷$\pm$ e/2的激发可能存在。这同样适用于三维烧绿石晶格。在前一种情况下,分数电荷被限制。讨论了弱恒定约束力的起源,指出了它与夸克和弦论的某些相似之处。对于棋盘格点,本文用紧U(1)规范理论描述了一个公式。此外,还讨论了在特殊填充情况下的铁磁性的新动力学机制。

英文摘要:

We give an overview of recent work on charge degrees of freedom of strongly correlated electrons on geometrically frustrated lattices. Special attention is paid to the checkerboard lattice, i.e., the two-dimensional version of a pyrochlore lattice and to the kagome lattice. For the checkerboard lattice it is shown that at half filling when spin degrees of freedom are neglected and quarter filling when they are included excitations with fractional charges $\pm$e/2 may exist. The same holds true for the three-dimensional pyrochlore lattice. In the former case the fractional charges are confined. The origin of the weak constant confining force is discussed and some similarities to quarks and to string theory are pointed out. For the checkerboard lattice a formulation in terms of a compact U(1) gauge theory is described. Furthermore a new kinetic mechanism for ferromagnetism at special fillings of a kagome lattice is discussed.

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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