Berlin 2015 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 55: Low-Dimensional Systems: 2D – Theory
TT 55.8: Talk
Wednesday, March 18, 2015, 11:30–11:45, H 3010
Dimensional-Crossover-Driven Mott Transition: A Variational Plaquette Study — •Benjamin Lenz1, Salvatore R. Manmana1, Marcin Raczkowski2, Thomas Pruschke1, and Fakher F. Assaad3 — 1Institut für Theoretische Physik, Georg-August-Universität Göttingen, D-37073 Göttingen, Germany — 2Department of Physics and Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universität München, D-80333 München, Germany — 3Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
Recently the metal-insulator Mott transition has been studied for a quasi-two-dimensional frustrated Hubbard model with next-nearest-neighbor hopping [Raczkowski, Assaad, PRL 109 (2012)]. Following up on this CDMFT study at finite temperatures, we analyze the crossover-driven Mott transition at zero temperature by means of variational cluster approximation (VCA). Here, we focus on coupling bath sites to the correlated sites of the reference system to carefully investigate the order of the transition. The effects of this extension on the phase diagram are studied and the insulator-metal transition is found to be of first order for large and intermediate inter-chain coupling strengths. This allows us to pursue the transition to small coupling strengths where remnant 1D effects like Umklapp scattering are expected to become important.