The Structure of the Pairing Interaction in the 2D Hubbard Model

Details The Structure of the Pairing Interaction in the 2D Hubbard Model The Structure of the Pairing Interaction in the 2D Hubbard Model

2005-08-15

arxiv.org/abs/cond-mat/0508361v2

Phys. Rev. Lett. 96, 047005 (2006)

Physics

Condensed Matter

Superconductivity

Published version. 4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.96.047005

Dynamic cluster Monte Carlo calculations for the doped two-dimensional Hubbard model are used to study the irreducible particle-particle vertex responsible for $d_{x^2-y^2}$ pairing in this model. This vertex increases with increasing momentum transfer and decreases when the energy transfer exceeds a scale associated with the $Q=(\pi, \pi)$ spin susceptibility. Using an exact decomposition of this vertex into a fully irreducible two-fermion vertex and charge and magnetic exchange channels, the dominant part of the effective pairing interaction is found to come from the magnetic, spin S=1 exchange channel.

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