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Numerical calculation of spectral functions of the Bose-Hubbard model using bosonic dynamical mean-field theory
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SYSNO ASEP 0452026 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Numerical calculation of spectral functions of the Bose-Hubbard model using bosonic dynamical mean-field theory Author(s) Panas, J. (PL)
Kauch, Anna (FZU-D) RID
Kuneš, Jan (FZU-D) RID, ORCID, SAI
Vollhardt, D. (DE)
Byczuk, K. (PL)Source Title Physical Review. B - ISSN 1098-0121
Roč. 92, č. 4 (2015), "045102-1"-"045102-9"Number of pages 9 s. Language eng - English Country US - United States Keywords Bose-Hubbard model ; Bose-Einstein condensation ; superfluidity Subject RIV BE - Theoretical Physics Institutional support FZU-D - RVO:68378271 UT WOS 000357487000004 EID SCOPUS 84937855816 DOI 10.1103/PhysRevB.92.045102 Annotation We calculate the momentum dependent spectral function of the Bose-Hubbard model on a simple cubic lattice in three dimensions within the bosonic dynamical mean-field theory (B-DMFT). The continuous-time quantum Monte Carlo method is used to solve the self-consistent B-DMFT equations together with the maximum entropy method for the analytic continuation to real frequencies. Results for weak, intermediate, and strong interactions are presented. In the limit of weak and strong interactions very good agreement with results obtained by perturbation theory is found. By contrast, at intermediate interactions the results differ significantly, indicating that in this regime perturbative methods fail to describe the dynamics of interacting bosons. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2016
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