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TT: Tiefe Temperaturen

TT 28: Correlated Electrons: General Theory

TT 28.7: Vortrag

Donnerstag, 30. März 2006, 11:45–12:00, HSZ 301

Self-energy-functional approach (SFA) as a scheme for reduction of finite size effects — •Krunoslav Požgajčić — Institut für Physik, KOMET 337, Universität Mainz, 55099 Mainz, Germany

Self-energy-functional approach (Michael Potthoff, Eur. Phys. J. B 32, 429(2003)) and its extensions (Ning-Hua Tong, Phys. Rev. B 72, 115104(2005)) have been proposed as a general framework for embedded cluster methods. We will use SFA for different models in regimes which are characterized by strong finite size effects, like is the case with metallic states. It will be demonstrated that SFA can be regarded as a prescription for reduction of those effects. Other schemes devised for reduction of finite size effects will also be discussed.