Density-Induced Breaking of Pairs in the Attractive Hubbard Model

Details Density-Induced Breaking of Pairs in the Attractive Hubbard Model Density-Induced Breaking of Pairs in the Attractive Hubbard Model

1998-02-23

arxiv.org/abs/cond-mat/9802239v1

Physics

Condensed Matter

5 pages, 4 figures, accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.80.3109

A conserving T-matrix approximation is applied to the two-dimensional attractive Hubbard model in the low-density regime. A set of self-consistent equations is solved in the real-frequency domain to avoid the analytic continuation procedure. By tuning the chemical potential the particle density was varied in the limits 0.01 < n < 0.18. For the value of the attractive potential U=8t the binding energy of pairs monotonically decreases with increasing n, from its zero-density limit 2.3t and vanishes at a critical density n=0.19. A pairing-induced pseudogap in the single-particle density of states is found at low densities and temperatures.

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