Localization of correlated fermions in optical lattices with speckle disorder

Details Localization of correlated fermions in optical lattices with speckle disorder Localization of correlated fermions in optical lattices with speckle disorder

2010-09-17

arxiv.org/abs/1009.3438v2

Phys. Rev. B 82, 235115 (2010)

Physics

Condensed Matter

Quantum Gases

12 pages, 16 figures, published version

Scientific paper

10.1103/PhysRevB.82.235115

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. Our results indicate that the Anderson-Mott and the Mott insulator are not continuously connected due to the specific character of speckle disorder. Furthermore, we discuss the effect of finite temperature on the single-particle spectral function.

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