Berlin 2015 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 55: Low-Dimensional Systems: 2D – Theory
TT 55.9: Talk
Wednesday, March 18, 2015, 11:45–12:00, H 3010
Ground state phase diagram of the bilayer square lattice at half filling — •Michael Golor1, Timo Reckling1,2, Laura Classen2, Michael M. Scherer2, and Stefan Wessel1 — 1Institut für Theoretische Festkörperphysik, RWTH Aachen — 2Institut für Theoretische Physik, Universität Heidelberg
We employ a combination of functional renormalization group calculations and projective determinantal quantum Monte Carlo simulations to examine the Hubbard model on the square lattice bilayer at half filling. We obtain a comprehensive account on the ground state phase diagram with respect to the extent of the system's metallic and (antiferromagnetically ordered) Mott-insulating as well as band-insulating regions. We discuss the difficulty in exploring the weak-coupling regime with quantum Monte Carlo and identify the non-interacting system's Fermi surface as its origin.