Regensburg 2004 – scientific programme

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TT: Tiefe Temperaturen

TT 26: Korrelierte Elektronen: Theorie II

TT 26.8: Talk

Thursday, March 11, 2004, 11:30–11:45, H18

Variational cluster extension approach to the doped Hubbard model — •Björn Michaelis, Michael Potthoff, and Werner Hanke — Institut für theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland, D-97074 Würzburg

Thermodynamic properties and single particle excitations of the one-band Hubbard model are calculated in the one and two dimensional case on the basis of the recently proposed selfenergy-functional theory (No-dqSFTNo-dq, Eur. Phys. J. B 32 (429) ,2003). We use exact diagonalization to get the selfenergy of finite systems and then obtain the Greensfunction of the infinite lattice by means of SFT. A particle reservoir is included and determined selfconsistently to achieve continuous doping. Results about the filling and bandwith controlled Mott metal-insulator transition are presented.