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Quantum Phase Transitions in the Bosonic Single-Impurity Anderson Model | | Hyun-Jung Lee
; Ralf Bulla
; | | Date: |
13 Jun 2006 | | Subject: | Statistical Mechanics; Other | | Abstract: | We consider a quantum impurity model in which a bosonic impurity level is coupled to a non-interacting bosonic bath, with the bosons at the impurity site subject to a local Coulomb repulsion U. Numerical renormalization group calculations for this bosonic single-impurity Anderson model reveal a zero-temperature phase diagram where Mott phases with reduced charge fluctuations are separated from a Bose-Einstein condensed phase by lines of quantum critical points. We discuss possible realizations of this model, such as atomic quantum dots in optical lattices. Furthermore, the bosonic single-impurity Anderson model appears as an effective impurity model in a dynamical mean-field theory of the Bose-Hubbard model. | | Source: | arXiv, cond-mat/0606325 | | Services: | Forum | Review | PDF | Favorites | |
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