Spectral function and quasi-particle damping of interacting bosons in two dimensions

Details Spectral function and quasi-particle damping of interacting bosons in two dimensions Spectral function and quasi-particle damping of interacting bosons in two dimensions

2008-11-05

arxiv.org/abs/0811.0624v2

Phys. Rev. Lett. 102, 120601 (2009)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 3 figures, revisited version, to appear as Phys. Rev. Letter

Scientific paper

10.1103/PhysRevLett.102.120601

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.

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