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

• Published in: Condensed Matter Physics
• Date: 2015
• Main Authors: Stasyuk, I.V., Velychko, O.V., Vorobyov, O.
• Format: Article
• Language: English
• Published: Інститут фізики конденсованих систем НАН України 2015
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/155265
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Phonon-like excitations in the two-state Bose-Hubbard model / I.V. Stasyuk, O.V. Velychko, O. Vorobyov // Condensed Matter Physics. — 2015. — Т. 18, № 4. — С. 43004: 1–14. — Бібліогр.: 35 назв. — англ.

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...