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Generation ofd-wave coupling in the two-dimensional Hubbard model from functional renormalization

H. C. Krahl, J. A. Müller, C. Wetterich
2009 Physical Review B  

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2008 pre-print arXiv:0801.1773v1 fatcat:lznanrbagnekjlbfxir56r3awm

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2009 accepted
arXiv:0801.1773v2 fatcat:wxy3e4ylkrb5bhumasqmztrm5a
Within the two-dimensional repulsive t-t'-Hubbard model, an attractive coupling in the d-wave pairing channel is induced by antiferromagnetic fluctuations. We investigate this coupling using functional renormalization group equations. The momentum dependent d-wave coupling can be bosonized by the use of scale dependent field transformations. We propose an effective coarse grained model for the Hubbard model which is based on the exchange of antiferromagnetic and d-wave collective bosons.
doi:10.1103/physrevb.79.094526 fatcat:jfczbyktkvbxvmqapngbzj7gju
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H. C. Krahl, J. A. Müller, C. Wetterich. "Generation ofd-wave coupling in the two-dimensional Hubbard model from functional renormalization." Physical Review B 79.9 (2009)