Interaction flow method for many-fermion systems

Details Interaction flow method for many-fermion systems Interaction flow method for many-fermion systems

2004-03-25

arxiv.org/abs/cond-mat/0403633v1

Phys. Rev. B 70, 235115 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

14 pages, 14 figures

Scientific paper

10.1103/PhysRevB.70.235115

We propose an interaction flow scheme that sums up the perturbation expansion of many-particle systems by successively increasing the interaction strength. It combines the unbiasedness of renormalization group methods with the simplicity of straight-forward perturbation theory. Applying the scheme to fermions in one dimension and to the two-dimensional Hubbard model we find that at one-loop level and low temperatures there is ample agreement with previous one-loop renormalization group approaches. We furthermore present results for the momentum-dependence of spin, charge and pairing interactions in the two-dimensional Hubbard model.

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