Fyzikální ústav Akademie věd ČR

Seminář Úterý, 7. prosinec 2010 - 15:00 - 16:00

Přednášející: Anna Kauch (Center for Electronic Correlations and Magnetism, University of Ausburg)
Místo: Na Slovance, přednáškový sál v přízemí
Pořadatelé: Oddělení teorie kondenzovaných látek
Jazyk přednášky: anglicky

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.