Regensburg 2010 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 32: MLT: Quantum Liquids, Bose-Einstein Condensates, Ultra-cold Atoms, ... 2
TT 32.7: Talk
Thursday, March 25, 2010, 16:00–16:15, H18
Strongly correlated fermions in disordered lattices — •Denis Semmler1, Krzysztof Byczuk2, and Walter Hofstetter1 — 1Institut für Theoretische Physik, J. W. Goethe-Universität, D-60438 Frankfurt, Germany — 2Institute of Theoretical Physics, Warsaw University, ul. Hoża 69, 00-681 Warszawa, Poland
Strongly correlated fermions in a lattice exposed to a disorder potential are investigated by means of the Anderson-Hubbard model. We employ the statistical dynamical mean-field theory, which incorporates both fluctuations due to disorder and local correlations due to interactions. In the case of binary disorder, the complete paramagnetic ground state phase diagram is obtained, which consists of disordered correlated metal, Anderson-Mott insulator and band insulator [1]. Binary disordered fermions can be realized by loading two species of atoms into an optical lattice of which one is immobile [2]. Furthermore, we investigate the effect of realistic speckle disorder in combination with hopping disorder, which is relevant for future experiments within the framework of ultracold atoms in optical lattices. [1] D. Semmler, K. Byczuk, and W. Hofstetter, arXiv:0911.0934.
[2] S. Ospelkaus, C. Ospelkaus, O. Wille, M. Succo, P. Ernst, K. Sengstock and K. Bongs, Phys. Rev. Lett. 96, 180403 (2006).