Title: Energy spectrum and phase diagrams of two-sublattice hard-core boson model
Author(s):

	I.V. Stasyuk (Institute for Condensed Matter Physics National academy of Sciences of Ukraine, 1 Sventsitskii Str., 79011 Lviv, Ukraine) ,
	O. Vorobyov (Institute for Condensed Matter Physics National academy of Sciences of Ukraine, 1 Sventsitskii Str., 79011 Lviv, Ukraine)

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) phase diagrams as well as the phase with the Bose-Einstein condensate (SF phase) are built.

Key words: hard-core bosons, spectral density, phase diagrams
PACS: 03.75.Hh,03.75.Lm,71.35.Lk

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