Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 23: Correlated Electrons: (General) Theory

TT 23.12: Vortrag

Mittwoch, 27. Februar 2008, 17:15–17:30, H 0104

Inhomogeneous solutions of the charge rotationally invariant Gutzwiller approach for the Hubbard model — •Falk Günther and Götz Seibold — BTU Cottbus, PO BOX 101344, 03013 Cottbus

We present a charge rotationally invariant Gutzwiller approach for the attractive Hubbard model. It is shown the formalism can be used to calculate homogeneous and inhomogeneous charge-ordered (CDW) and superconducting (SC) structures. Our formalism reproduces the correct degeneracy between CDW and SC phase in the half filled system. Restricting to on-site attraction we find that inhomogeneous structures e.g. anti-phase domain walls with regard to the SC order are only excitations of the system but never constitute the ground state of the model. In addition we present results for the Gutzwiller approximated extended Hubbard model including nearest neighbor repulsion, which allows for a competition between inhomogeneous CDW and SC textures.