Magnetic and superconducting instabilities of the Hubbard model at the Van Hove filling

被引:128
作者
Honerkamp, C [1 ]
Salmhofer, M
机构
[1] ETH Honggerberg, CH-8093 Zurich, Switzerland
[2] Univ Leipzig, D-04109 Leipzig, Germany
关键词
D O I
10.1103/PhysRevLett.87.187004
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We use a novel temperature-flow renormalization group technique to analyze magnetic and superconducting instabilities in the two-dimensional t - t' Hubbard model for particle densities close to the Van Hove filling as a function of the next-nearest-neighbor hopping t'. In the one-loop flow at the Van Hove filling, the characteristic temperature for the flow to strong coupling is suppressed drastically around t(c)' approximate to -0.33t, suggesting a quantum critical point between d-wave pairing at moderate t' > t(c)' and ferromagnetism for t' < t(c)'. Upon increasing the particle density in the latter regime, the leading instability occurs in the triplet pairing channel.
引用
收藏
页码:187004 / 1
页数:4
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