To the top

Page Manager: Webmaster
Last update: 9/11/2012 3:13 PM

Tell a friend about this page
Print version

Discretized thermal Green… - University of Gothenburg, Sweden Till startsida
Sitemap
To content Read more about how we use cookies on gu.se

Discretized thermal Green's functions

Journal article
Authors Mats Granath
Andro Sabashvili
Hugo Strand
Stellan Östlund
Published in Annalen der Physik
Volume 524
Issue 3-4
Pages 147-152
ISSN 0003-3804
Publication year 2012
Published at Department of Physics (GU)
Pages 147-152
Language en
Links onlinelibrary.wiley.com.ezproxy.ub....
Subject categories Condensed Matter Physics

Abstract

We present a spectral weight conserving formalism for Fermionic thermal Green's functions that are discretized in imaginary time τ and thus periodic in imaginary (“Matsubara”) frequency i ωn. The formalism requires a generalization of the Dyson equation G (G0, Σ) and the Baym-Kadanoff-Luttinger-Ward functional for the free energy β Ω = Γ (G). A conformal transformation is used to analytically continue the periodized Matsubara Green's function to real frequencies in a way that conserves the discontinuity at t = 0 of the corresponding real-time Green's function. This allows numerical Green's function calculations of very high precision and it appears to give a well controlled convergent approximation in the τ discretization. The formalism is tested on dynamical mean field theory calculations of the paramagnetic Hubbard model.

Page Manager: Webmaster|Last update: 9/11/2012
Share:

The University of Gothenburg uses cookies to provide you with the best possible user experience. By continuing on this website, you approve of our use of cookies.  What are cookies?