Fyzikální ústav Akademie věd ČR

Mott-insulator and superfluid phases of correlated bosons -- the bosonic dynamical mean-field approach with the strong coupling impurity solver

Seminar Tuesday, 07/12/2010 15:00 - 16:00

Speakers: Anna Kauch (Center for Electronic Correlations and Magnetism, University of Ausburg)
Place: Na Slovance, main lecture room
Presented in English
Organisers: Department of Condensed Matter Theory

Abstract
The bosonic dynamical mean-field theory (B-DMFT), formulated by Byczuk and Vollhardt (Phys. Rev. B 77, 235106 (2008)), is a comprehensive and thermodynamically consistent approximation in which the normal and Bose-Einstein condensed bosons are treated on equal footing. In this theory the lattice bosonic problem is replaced by a single impurity coupled to two bosonic baths (corresponding to normal and condensed bosons, respectively). The resulting set of equations, the so-called "impurity problem", has to be solved self-consistently. I will present a brief introduction to the B-DMFT as well as an approximate strong coupling solution of the impurity problem. The solution gives a finite temperature phase diagram of correlated bosons with Mott-insulating and superfluid phases separated by a normal (compressible) phase.

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