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TT: Fachverband Tiefe Temperaturen

TT 55: Low-Dimensional Systems: 2D – Theory

TT 55.9: Vortrag

Mittwoch, 18. März 2015, 11:45–12:00, H 3010

Ground state phase diagram of the bilayer square lattice at half filling — •Michael Golor¹, Timo Reckling^1,2, 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.