19 citations · 95 across the 27 of their papers we have counts for
6 papers · 1 filter
Bose-Einstein condensation and/or modulation of "displacements" in the two-state Bose-Hubbard model
I. V. Stasyuk, O. V. Velychko
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 all…
Investigation of the bosonic spectrum of two-dimensional optical graphene-type lattices. Superfluid phase
I. V. Stasyuk, O. V. Velychko, I. R. Dulepa
The energy spectrum of a system of Bose atoms in the superfluid phase in an optical lattice of the graphene type has been studied. The dispersion laws for the energy bands and the…
Investigation of the bosonic spectrum of two-dimensional optical graphene-type lattices. Normal phase
I. V. Stasyuk, I. R. Dulepa, O. V. Velychko
The band spectrum of bosonic atoms in two-dimensional honeycomb optical lattices with the graphene-type structure has been studied. The dispersion laws in the bands and the one-par…
Energy spectrum and phase diagrams of two-sublattice hard-core boson model
I. V. Stasyuk, O. Vorobyov
The energy spectrum, spectral density and phase diagrams have been obtained for two-sublattice hard-core boson model in frames of random phase approximation approach. Reconstructio…
The two-state Bose-Hubbard model in the hard-core boson limit: Non-ergodicity and the Bose-Einstein condensation
I. V. Stasyuk, O. V. Velychko
The Bose-Einstein condensation in the hard-core boson limit (HCB) of the Bose-Hubbard model with two local states and the particle hopping in the excited band only is investigated.…
Two-state Bose-Hubbard model in the hard-core boson limit
I. V. Stasyuk, O. V. Velychko
Phase transition into the phase with Bose-Einstein (BE) condensate in the two-band Bose-Hubbard model with the particle hopping in the excited band only is investigated. Instabilit…