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- Title
Spectral Properties of the Bose-Hubbard Model Within the Cluster Perturbation Theory in X-Operators Representation.
- Authors
Nikolaev, Sergey; Ovchinnikov, Sergey; Kudashkin, Kirill
- Abstract
We study the two-dimensional ultracold Bose gas in optical lattice. We use cluster perturbation theory based on Hubbard X-operators to calculate the spectral function and phase diagram of Bose-Hubbard model which is minimal model to describe behavior of ultracold gases in optical lattices. We have analyzed spectral properties of spinless bosons in a square lattice taking into account the short-range correlation.
- Subjects
OPTICAL lattices; BOSE-Einstein gas; QUANTUM perturbations; QUASIPARTICLES; BOSONS
- Publication
Journal of Superconductivity & Novel Magnetism, 2017, Vol 30, Issue 1, p103
- ISSN
1557-1939
- Publication type
Article
- DOI
10.1007/s10948-016-3781-y