Functional renormalization group beyond the static approximation and its application to the two-dimensional Hubbard model

✍ Scribed by Hirokazu Takashima; Ryotaro Arita; Kazuhiko Kuroki; Hideo Aoki

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 240 KB
• Volume: 470
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2009.12.052

✦ Synopsis

While the functional renormalization group is a powerful theoretical method, the static approximation has been usually adopted in which the Matsubara frequency dependence of vertex functions is ignored. We propose a formalism beyond the static approximation with an efficient parameterization in the Matsubara frequency space for the vertex functions to incorporate the self-energy.