Diagrammatic perturbation theory and the pseudogap

Details Diagrammatic perturbation theory and the pseudogap Diagrammatic perturbation theory and the pseudogap

2003-09-24

arxiv.org/abs/cond-mat/0309552v2

Phys. Rev. B 70, 144403 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.70.144403

We study a model of quasiparticles on a two-dimensional square lattice coupled to Gaussian distributed dynamical fields. The model describes quasiparticles coupled to spin or charge fluctuations and is solved by a Monte Carlo sampling of the molecular field distributions. The non-perturbative solution is compared to various approximations based on diagrammatic perturbation theory. When the molecular field correlations are sufficiently weak, the diagrammatic calculations capture the qualitative aspects of the quasiparticle spectrum. For a range of model parameters near the magnetic boundary, we find that the quasiparticle spectrum is qualitatively different from that of a Fermi liquid in that it shows a double peak structure, and that the diagrammatic approximations we consider fail to reproduce, even qualitatively, the results of the Monte Carlo calculations. This suggests that the pseudogap induced by a coupling to antiferromagnetic fluctuations and the spin-splitting of the quasiparticle peak induced by a coupling to ferromagnetic spin-fluctuations lie beyond diagrammatic perturbation theory.

Affiliated with

Also associated with

No associations

Rating

Diagrammatic perturbation theory and the pseudogap 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 Diagrammatic perturbation theory and the pseudogap, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Diagrammatic perturbation theory and the pseudogap will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-509735