Localization of correlated fermions in optical lattices with speckle disorder
| Autor: | Semmler, D., Wernsdorfer, J., Bissbort, U., Byczuk, K., Hofstetter, W. |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 82, 235115 (2010) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.82.235115 |
| Popis: | 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. Comment: 12 pages, 16 figures, published version |
| Databáze: | arXiv |
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