Spectral function and quasi-particle damping of interacting bosons in two dimensions
Other Condensed Matter
2011-12-05 v2 High Energy Physics - Theory
Abstract
We employ the functional renormalization group to study dynamical properties of the two-dimensional Bose gas. Our approach is free of infrared divergences, which plague the usual diagrammatic approaches, and is consistent with the exact Nepomnyashchy identity, which states that the anomalous self-energy vanishes at zero frequency and momentum. We recover the correct infrared behavior of the propagators and present explicit results for the spectral line-shape, from which we extract the quasi-particle dispersion and damping.
Keywords
Cite
@article{arxiv.0811.0624,
title = {Spectral function and quasi-particle damping of interacting bosons in two dimensions},
author = {Andreas Sinner and Nils Hasselmann and Peter Kopietz},
journal= {arXiv preprint arXiv:0811.0624},
year = {2011}
}
Comments
4 pages, 3 figures, revisited version, to appear as Phys. Rev. Letter