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TT: Fachverband Tiefe Temperaturen
TT 48: CE: Metal-Insulator Transition 2
TT 48.4: Vortrag
Donnerstag, 17. März 2011, 11:15–11:30, HSZ 105
(contribution withdrawn) Interacting electrons in a random potential: Absence of thermodynamic signatures of a metal-insulator transition in two dimensions — •Prabuddha Chakraborty1, Krzysztof Byczuk2, and Dieter Vollhardt1 — 1Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135, Augsburg, Germany — 2Institute of Theoretical Physics, University of Warsaw, ul. Hoza 69, 00-681, Warszawa, Poland
The properties of a quantum phase transition where a two-dimensional metallic phase arises out of an Anderson insulator as a consequence of short-range electronic interactions are investigated using quantum Monte Carlo simulations. We present results for the compressibility and the antiferromagnetic and uniform susceptibilities. We demonstrate that, in contrast to predictions made using perturbative Renormalization Group calculations, the susceptibilities show no signature of the metal-insulator transition. To explore the nature of the metallic state itself the behaviour of thermodynamic quantities deep in the metallic phase is also explored.