Quantum phase transitions in the bosonic single-impurity Anderson model

H.-J. Lee and R. Bulla ()

The European Physical Journal B: Condensed Matter and Complex Systems, 2007, vol. 56, issue 3, 199-203

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. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Keywords: 05.10.Cc Renormalization group methods; 05.30.Jp Boson systems; 03.75.Nt Other Bose-Einstein condensation phenomena (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1140/epjb/e2007-00118-3

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