Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 37: Matter At Low Temperature: Quantum Liquids, Bose-Einstein Condensates, Ultra-cold Atoms, ... 2
TT 37.12: Vortrag
Donnerstag, 29. März 2012, 12:30–12:45, H 3005
Bosonic spectral functions in the dynamical mean-field theory calculated with a strong-coupling impurity solver — •Anna Kauch1, Krzysztof Byczuk2, and Dieter Vollhardt1 — 1Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany — 2Institute of Theoretical Physics, Faculty of Physics, University of Warsaw, ul. Hoza 69, PL-00-681 Warszawa, Poland
With the use of a strong-coupling solver for the bosonic dynamical mean-field theory (B-DMFT)[1] we investigate the evolution of spectral functions across the phase transition from the Mott-insulating to the superfluid phase in the Bose-Hubbard model. The B-DMFT provides a
comprehensive and thermodynamically consistent description of correlated lattice bosons. Within the B-DMFT normal and Bose-Einstein condensed bosons are treated on equal footing. In the B-DMFT the bosonic lattice problem is replaced by a single site coupled to two bosonic baths corresponding to normal and condensed bosons, respectively. This yields a set of equations which have to be solved self-consistently. The use of a strong-coupling solver allows us to compute the spectral functions in different transition scenarios (density driven vs. interaction driven transition).
K. Byczuk and D. Vollhardt, Phys. Rev. B 77, 235106 (2008)