7 citations · 15 across the 11 of their papers we have counts for
11 papers
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…
Phonon-like excitations in the two-state Bose-Hubbard model
I. V. Stasyuk, O. V. Velychko, O. Vorobyov
The spectrum of phonon-like collective excitations in the system of Bose-atoms in optical lattice (more generally, in the system of quantum particles described by the Bose-Hubbard…
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…
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…