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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 ASEP0452026
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleNumerical 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 TitlePhysical Review. B - ISSN 1098-0121
    Roč. 92, č. 4 (2015), "045102-1"-"045102-9"
    Number of pages9 s.
    Languageeng - English
    CountryUS - United States
    KeywordsBose-Hubbard model ; Bose-Einstein condensation ; superfluidity
    Subject RIVBE - Theoretical Physics
    Institutional supportFZU-D - RVO:68378271
    UT WOS000357487000004
    EID SCOPUS84937855816
    DOI10.1103/PhysRevB.92.045102
    AnnotationWe 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.
    WorkplaceInstitute of Physics
    ContactKristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
    Year of Publishing2016
Number of the records: 1  

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