Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 32: Correlated Electrons: Poster Session

TT 32.86: Poster

Donnerstag, 28. Februar 2008, 14:00–18:00, Poster B

Lifetime of spinless fermions on a square lattice — •Mehmet Kadiroglu and Jochen Gemmer — Physics Department, University of Osnabrück, Barbarastr. 7, 49069 Osnabrück, Germany

We investigate the dynamics of spinless fermions on a square lattice which may hop to nearest neighbor sites, and also experience a hard-core repulsion at the nearest neighbor sites. We are especially interested in the dynamics of an excited state where one spinless fermion is put additionally into the system and occupies a momentum mode. We try to determine the lifetime of this excitation by perturbation theoretical methods, such as Green’s functions techniques and/or Projection operator techniques.