Numerical calculation of spectral functions of the Bose-Hubbard model using bosonic dynamical mean-field theory

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F15%3A00452026" target="_blank" >RIV/68378271:_____/15:00452026 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1103/PhysRevB.92.045102" target="_blank" >http://dx.doi.org/10.1103/PhysRevB.92.045102</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevB.92.045102" target="_blank" >10.1103/PhysRevB.92.045102</a>

Result language
angličtina
Original language name
Numerical calculation of spectral functions of the Bose-Hubbard model using bosonic dynamical mean-field theory
Original language description
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.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BE - Theoretical physics
OECD FORD branch
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Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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