Phonon-like excitations in the two-state Bose-Hubbard model

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 model) is investigated. Such excitations appear due to displacements of particles with respect to their local equilibriu...

Full description

Bibliographic Details

Published in:	Condensed Matter Physics
Main Authors:	I.V. Stasyuk, O.V. Velychko, O. Vorobyov
Format:	Article
Language:	English
Published:	Yukhnovskii Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine 2015-12-01
Subjects:	Bose-Hubbard model hard-core bosons Bose-Einstein condensation excited band phonons
Online Access:	http://dx.doi.org/10.5488/CMP.18.43004