Uncertainty Principle Enhanced Pairing Correlations in Projected Fermi Systems Near Half Filling

Details Uncertainty Principle Enhanced Pairing Correlations in Projected Fermi Systems Near Half Filling Uncertainty Principle Enhanced Pairing Correlations in Projected Fermi Systems Near Half Filling

1996-12-11

arxiv.org/abs/cond-mat/9612098v1

Physics

Condensed Matter

Strongly Correlated Electrons

RevTex 11 pages + 1 ps figure. Date 19 September 1996, Ver.2

Scientific paper

10.1088/0305-4470/30/18/005

We point out the curious phenomenon of order by projection in a class of lattice Fermi systems near half filling. Enhanced pairing correlations of extended s-wave Cooper pairs result from the process of projecting out s-wave Cooper pairs, with negligible effect on the ground state energy. The Hubbard model is a particularly nice example of the above phenomenon, which is revealed with the use of rigorous inequalities including the Uncertainty Principle Inequality. In addition, we present numerical evidence that at half filling, a related but simplified model shows ODLRO of extended s-wave Cooper pairs.

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