Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 38: Correlated Electrons: Metal-Insulator Transition 1

TT 38.11: Talk

Wednesday, March 13, 2013, 12:15–12:30, H20

Numerical solution of the t-J model with random coupling in infinite dimensions — •Junya Otsuki^1,2 and Dieter Vollhardt¹ — ¹Theoretische Physik III, Zentrum für Elektronische Korrelationen und Magnetismus, Universität Augsburg — ²Department of Physics, Tohoku University, Sendai, Japan

To explore the nature of the metallic state near the transition to a Mott insulator, we solve the t-J model with random exchange interaction in d=∞ dimensions. A numerically exact solution is obtained by an extension of the continuous-time quantum Monte Carlo (CT-QMC) method to a model with vector bosonic field coupled to the local spin. It is shown that the paramagnetic solution near the Mott insulator describes an incoherent metal with a residual moment, where the single-particle excitations leads to an additional band separated from the Mott-Hubbard band.