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- W2799951540 abstract "Abstract Gauge potentials with different configurations have been recently realized in the optical lattice experiments. It is remarkable that one of the simplest gauge potential can generate particle energy spectrum with the self-similar structure known as a Hofstadter butterfly. We investigate theoretically the impact of strong on-site interaction on such a spectrum in the bosonic Mott insulator within Bose–Hubbard model. In particular, it is shown that the fractal structure is encoded in the quasi-particle and hole bosonic branches for different lattice backgrounds. For example a square lattice and other structures (brick-wall and staggered magnetic flux lattice) which contain Dirac points in energy dispersions are considered. This shows that single-particle physics is still present even in the strong interaction limit for whole Hofstadter spectrum. Additionally we observe, that although in brick-wall and staggered flux lattices the quasi-particle densities of states look qualitatively similar, the corresponding Hofstadter butterfly assumes different forms. In particular, we use a superposition of two different synthetic gauge fields which appears to be a generator of non-trivial phenomena in the optical lattice systems. We also discuss the consequences of these phenomena on the phase diagrams between bosonic Mott insulator and superfluid phase. The analysis is carried out within the strong coupling expansion method on the finite size lattices and also at finite temperatures which are relevant for the currently made experiments." @default.
- W2799951540 created "2018-05-17" @default.
- W2799951540 creator A5020895368 @default.
- W2799951540 creator A5079674124 @default.
- W2799951540 date "2018-06-01" @default.
- W2799951540 modified "2023-09-23" @default.
- W2799951540 title "Phase diagrams and Hofstadter butterflies in the strongly correlated bosonic systems on the lattices with Dirac points" @default.
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- W2799951540 doi "https://doi.org/10.1016/j.aop.2018.03.021" @default.
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