Energy spectrum and phase diagrams of two-sublattice hard-core boson model

Abstract

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. Reconstruction of boson spectrum at the change of temperature, chemical potential and energy difference between local positions in sublattices is studied. The phase diagrams illustrating the regions of existence of a normal phase which can be close to Mott-insulator (MI) or charge-density (CDW) phases as well as the phase with the Bose-Einstein condensate (SF phase) are built.

9 pages, 4 figures

References in corpus (4)

• Many-Body Physics with Ultracold Gases
• Spectral weight redistribution in strongly correlated bosons in optical lattices
• Artificial gauge fields for the Bose-Hubbard model on a checkerboard superlattice and extended Bose-Hubbard model
• Superfluid to Mott-insulator transition of cold atoms in optical lattices

Cited by in corpus (3)

• Phase transitions in Bose-Fermi-Hubbard model in the heavy fermion limit: Hard-core boson approach
• One-particle spectral densities and phase diagrams of one-dimensional proton conductors
• Phonon-like excitations in the two-state Bose-Hubbard model