Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1998-02-10
J. of Phys. Cond. Mat. 10,(31) 6931-6951 (1998)
Physics
Condensed Matter
Strongly Correlated Electrons
13 pages, including 14 figures
Scientific paper
10.1088/0953-8984/10/31/011
We have investigated the attractive Hubbard model in the low density limit for the 2D square lattice using the ladder approximation for the vertex function in a self-consistent, conserving formulation. In the parameter region where the on-site attraction is of the order of the bandwidth, we found no evidence of a pseudo gap. Further, we have observed that the suppression of the Fermi surface known to destroy superconductivity in one and two dimensions, when these systems are treated using a non self-consistent theory (Schmitt-Rink, et al., Phys. Rev. Lett. 63, 445 (1989)), does not occur when pair-pair interactions are included. However, we do find a quasiparticle lifetime that varies linearly with temperature, similar to many experiments. Thus, although this system has a Fermi surface, it shows non Fermi liquid type behaviour over a wide temperature range. We stress that our work uses thermal Green's functions along the real time axis, and thus allows for a more accurate determination of the dynamical properties of a model than theories that require extrapolations from the imaginary frequency axis.
Gooding R. J.
Letz M.
No associations
LandOfFree
A self-consistent, conserving theory of the attractive Hubbard model in two dimensions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A self-consistent, conserving theory of the attractive Hubbard model in two dimensions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A self-consistent, conserving theory of the attractive Hubbard model in two dimensions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-489314