Berlin 2005 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 7: Correlated Electrons - (General) Theory II
TT 7.4: Vortrag
Freitag, 4. März 2005, 17:30–17:45, TU H2053
Contractor Renormalization Group Approach to the Strongly-Correlated Hubbard Model — •Sascha Brehm1, Enrico Arrigoni2,1, and Werner Hanke1 — 1Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany — 2Institut für Theoretische Physik, Technische Universität Graz, Petersgasse 16, A-8010 Graz, Austria
In a first step, we apply the Contractor Renormalization Technique (CORE) to the 2-D Hubbard Model including bosonic plus fermionic excitations. The resulting Plaquette Boson-Fermion Model (PBFM) displays even qualitative changes (screening,etc.) compared to the so far exclusively considered purely bosonic Plaquette Model (E.Altman and A.Auerbach, Phys.Rev.B 65, 104508 (2002)). This is also shown in the case of the inter-layer Cooper-pair tunnelling theory. The phase diagram for the competing phases is then calculated within the slave-boson technique.