Exponential decay of equal-time four-point correlation functions in the Hubbard model on the copper-oxide lattice
arXiv:1204.6470
Abstract
For the Hubbard model on the two-dimensional copper-oxide lattice, equal-time four-point correlation functions at positive temperature are proved to decay exponentially in the thermodynamic limit if the magnitude of the on-site interactions is smaller than some power of temperature. This result especially implies that the equal-time correlation functions for singlet Cooper pairs of various symmetries decay exponentially in the distance between the Cooper pairs in high temperatures or in low-temperature weak-coupling regimes. The proof is based on a multi-scale integration over the Matsubara frequency.
60 pages, some changes in Introduction and References, Remark 2.2 was added, the construction remains the same, to appear in Annales Henri Poincare