Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 61: Correlated Electrons: (General) Theory 2
TT 61.6: Vortrag
Donnerstag, 23. März 2017, 10:45–11:00, HSZ 204
Influence of non-local interactions on the Mott metal-insulator transition. — •Malte Schüler1,2, Erik G. C. P. van Loon3, Mikhail I. Katsnelson3, and Tim O. Wehling1,2 — 1Universtity of Bremen, Institute for Theoretical Physics — 2Universtity of Bremen, Bremen Center for Computational Materials Science — 3Radboud University, Institute for Molecules and Materials
We investigate how short- and long-ranged non-local Coulomb interactions influence the metal-insulator phase boundary of the half-filled Hubbard model on square lattices and honeycomb lattices. We find that generally, non-local interactions stabilize the Fermi-liquid regime and that the phase boundary behaves linearly with infinitesimal non-local interactions. We present an upper bound for the boundary's slope. Our findings help to elucidate if the Hubbard model can describe the Mott transition in real materials. For our investigations, we use a variational principle which maps extended Hubbard models to effective purely local Hubbard models. The mapping relies on Quantum Monte Carlo solutions of the the local Hubbard model.