Flow of the quasiparticle weight in the N-patch renormalization group scheme
Flow of the quasiparticle weight in the N-patch renormalization group scheme
复制标题
N-patch 重整化群方案中准粒子权重的流程
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
M. Salmhofer
中科院分区：
文献类型：
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作者：
C. Honerkamp;M. Salmhofer
使用N片重整化群方法，我们研究了一维、弱二维和全二维哈伯德模型中准粒子权重的流动。在一个维度上，我们重现了Luttinger指数，它描述了准粒子峰向较低尺度的消失。此外，我们分析了准一维模型中的能带结构，链间跳跃，和流动的相互作用的影响。对于二维的情况下，我们研究如何抑制准粒子的重量影响流强耦合。我们发现，流到强耦合基本上保持不变。这加强了弱排斥哈伯德模型中d波超导性的证据。
Using the N-patch renormalization group method we investigate the flow of the quasiparticle weight in one-dimensional, weakly two-dimensional, and fully two-dimensional Hubbard models. In one dimension we reproduce the Luttinger exponent that describes the disappearance of the quasiparticle peak towards lower scales. Further we analyze effects of the band structure, interchain hopping, and the flow of the interactions in quasi-one-dimensional models. For the two-dimensional case we study how the suppression of the quasiparticle weight affects the flow to strong coupling. We find that the flow to strong coupling remains essentially unchanged. This strengthens the evidence for d-wave superconductivity in the weakly repulsive Hubbard model.