Regensburg 2010 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 12: CE: Metal-Insulator Transition 1
TT 12.7: Talk
Tuesday, March 23, 2010, 11:15–11:30, H19
Universal critical conductivity at the metal-insulator transition in the two-dimensional Anderson-Hubbard model — •Prabuddha Chakraborty1, Krzysztof Byczuk2, and Dieter Vollhardt1 — 1Theoretical Physics III, Center for Electronic Correlations and Magnetism, University of Augsburg, D-86135, Augsburg, Germany — 2Institute of Theoretical Physics, University of Warsaw, Warszawa, Poland
We demonstrate, through extensive quantum Monte-Carlo simulations, the existence of a universal critical conductivity at an Anderson insulator-metal transition in two dimensions.The universality of the critical conductivity across various models of disorder is presented, thus pointing to the existence of a quantum critical point with universal properties. We also present results for the compressibility and magnetic susceptibilities across the phase transition and compare them to experimental data and analytical renormalization group predictions. This research is supported through SFB 484 of the Deutsche Forschungsgemeinschaft.