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- W2811354570 abstract "Instabilities resulting in Bose-Einstein condensation and/or modulation of displacements in a system of quantum particles described by a two-state Bose-Hubbard model (with an allowance for the interaction between particle displacements on different lattice sites) are investigated. A possibility of modulation, which doubles the lattice constant, as well as the uniform displacement of particles from equilibrium positions are studied. Conditions for realization of the mentioned instabilities and phase transitions into the SF phase and into the ordered phase with frozen displacements are analyzed. The behaviour of order parameters is investigated and phase diagrams of the system are calculated both analytically (ground state) and numerically (at non-zero temperatures). It is revealed that the SF phase can appear as an intermediate one between the normal and ordered phases, while a supersolid phase is thermodynamically unstable and does not appear. The relation of the obtained results to the lattices with the double-well local potentials is discussed." @default.
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- W2811354570 date "2018-06-01" @default.
- W2811354570 modified "2023-10-03" @default.
- W2811354570 title "Bose-Einstein condensation and/or modulation of displacements in the two-state Bose-Hubbard model" @default.
- W2811354570 doi "https://doi.org/10.5488/cmp.21.23002" @default.
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