Seminars & Lectures
| * TITLE | Quantum phase transitions in the bosonic single-impurity Anderson model | ||||||
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| * DATE / TIME | 2007-03-31, 10:00 – 10:50 | ||||||
| * PLACE | Rm # 1423, 4th floor, KIAS | ||||||
| * 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 |
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