phonon-like excitations in the two-state bose-hubbard model

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ID: 134845
2015
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Abstract
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 equilibrium positions. The two-level model taking into account the transitions of bosons between the ground state and the first excited state in potential wells, as well as interaction between them, is used. Calculations are performed within the random phase approximation in the hard-core boson limit. It is shown that excitation spectrum in normal phase consists of the one exciton-like band, while in the phase with BE condensate an additional band appears. The positions, spectral weights and widths of bands strongly depend on chemical potential of bosons and temperature. The conditions of stability of a system with respect to the lowering of symmetry and displacement modulation are discussed.
Reference Key
stasyuk2015condensedphonon-like Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;I.V. Stasyuk;O.V. Velychko;O. Vorobyov
Journal conference on human factors in computing systems - proceedings
Year 2015
DOI
10.5488/CMP.18.43004
URL
http://dx.doi.org/10.5488/CMP.18.43004
Keywords Keywords not found

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