Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 37: MLT: Quantum Liquids, Bose-Einstein Condensates, Ultra-cold Atoms, ...
TT 37.12: Vortrag
Mittwoch, 16. März 2011, 17:15–17:30, HSZ 105
Localization of correlated fermions in optical lattices with speckle disorder — •Denis Semmler1, Julia Wernsdorfer1, Ulf Bissbort1, Krzysztof Byczuk2,3, and Walter Hofstetter1 — 1Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität, 60438 Frankfurt am Main, Germany — 2Institute of Theoretical Physics, Warsaw University, ul. Hoża 69, 00-681 Warszawa, Poland — 3Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute for Physics, University of Augsburg, 86135 Augsburg, Germany
Strongly correlated fermions in three- and two-dimensional optical lattices with experimentally realistic speckle disorder are investigated. We extend and apply the statistical dynamical mean-field theory, which treats local correlations non-perturbatively, to incorporate on-site and hopping-type randomness on equal footing. Localization due to disorder is detected via the probability distribution function of the local density of states. We obtain a complete paramagnetic ground state phase diagram for experimentally realistic parameters and find a strong suppression of the correlation-induced metal insulator transition due to disorder [1]. Our results indicate that the Anderson-Mott and the Mott insulator are not continuously connected due to the specific character of speckle disorder.
[1] D. Semmler, J. Wernsdorfer, U. Bissbort, K. Byczuk, and W. Hofstetter, arXiv:1009.3438.