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

Abstract

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 approx. -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.

4 pages, to appear in Physical Review Letters

References in corpus (3)

• Effects of the Van Hove singularities on magnetism and superconductivity in the t-t' Hubbard model: a parquet approach
• Electron-doping versus hole-doping in the 2D t-t' Hubbard model
• Nagaoka ferromagnetism in the two-dimensional infinite-U Hubbard model

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