Phys. Rev. Lett. 96, 047005 (2006) [4 pages]Structure of the Pairing Interaction in the Two-Dimensional Hubbard ModelReceived 15 August 2005; published 2 February 2006 Dynamic cluster Monte Carlo calculations for the doped two-dimensional Hubbard model are used to study the irreducible particle-particle vertex responsible for dx2-y2 pairing in this model. This vertex increases with increasing momentum transfer and decreases when the energy transfer exceeds a scale associated with the Q=(π,π) 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. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.047005
DOI:
10.1103/PhysRevLett.96.047005
PACS:
74.20.−z, 71.10.−w, 71.27.+a, 74.72.−h
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