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TT: Fachverband Tiefe Temperaturen

TT 102: Cold Atomic Gases - Poster Session

TT 102.4: Poster

Donnerstag, 3. April 2014, 15:00–19:00, P2

Numerical calculation of spectral functions of the Bose-Hubbard model using B-DMFT — •Jaromir Panas^1,3, Anna Kauch², Jan Kunes², Dieter Vollhardt³, and Krzysztof Byczuk¹ — ¹Institute of Theoretical Physics, Faculty of Physics, University of Warsaw, ul. Hoza 69, 00-681 Warszawa, Poland — ²Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 18221 Praha, Czech Republic — ³Theoretical Physics III, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany

Spectral functions of the Bose-Hubbard model are computed within the bosonic dynamical mean field theory (B-DMFT) [1] using a continuous-time quantum Monte Carlo (CT-QMC) solver together with maximum entropy method for analytic continuation. Results are obtained for different interaction strengths and chemical potentials and are compared with approximate results from a strong coupling solution of the B-DMFT equations [2].
K. Byczuk and D. Vollhardt, Phys. Rev. B 77, 235106 (2008)
A. Kauch, K. Byczuk, D. Vollhardt, Phys. Rev. B 85, 205115 (2012)