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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