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Large-N approach to the two-channel Kondo lattice

机译:大N方法用于两通道近藤晶格

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This paper studies the two-channel Kondo lattice in the Iarge-N limit at half-filling. In this model, the continuous channel-symmetry is spontaneously broken, forming a channel-ferromagnet in which one conduction channel forms a Kondo insulator, while the other remains conducting. The paper discusses how this ground state can be understood using the concept of order fractionalization, in which the channel magnetization breaks up into an emergent spinor order parameter. By integrating out the fermions, we derive an effective action that describes this symmetry breaking and its emergent collective modes. A remarkable observation is that topological defects in the order parameter carry a U(1) flux, manifested in the Aharonov-Bohm phase picked by electrons that orbit the defect. By studying the effective action, we argue that the phase diagram contains a nonmagnetic transition between a large and a small Fermi surface.
机译:本文研究了半填充时处于Iarge-N极限的两通道Kondo晶格。在此模型中,连续的通道对称性自发破坏,形成一个通道铁磁体,其中一个传导通道形成一个近藤绝缘子,而另一个保持传导。本文讨论了如何使用阶次分级化的概念来理解该基态,其中通道磁化强度分解为紧急的自旋阶数参数。通过整合费米子,我们得出了描述这种对称破坏及其新兴集体模式的有效行动。一个显着的观察结果是,阶数参数中的拓扑缺陷带有U(1)通量,表现为绕缺陷的电子所拾取的Aharonov-Bohm相。通过研究有效作用,我们认为相图包含了大费米表面和小费米表面之间的非磁性过渡。

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  • 来源
    《Physical review》 |2020年第7期|075133.1-075133.18|共18页
  • 作者单位

    Center for Materials Theory Rutgers University Piscataway New Jersey 08854 USA;

    Center for Materials Theory Rutgers University Piscataway New Jersey 08854 USA Hubbard Theory Consortium Department of Physics Royal Holloway University of London Egham Surrey TW20 0EX United Kingdom;

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