Density wave and a supersolid phases of correlated bosons with long-range

Dmitry Kovrizhin

Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, 01187 Dresden, Germany

We study the ground state phase diagramm and excitations of a system of bosons in an optical lattice with long-range interaction. In addition to the superfluid and the Mott-insulator phases we also find an insulating state (charge density wave phase) and a supersolid phase both with density modulations. We obtained the excitation spectrum in all four phases within a linear response theory. We propose a possibility of observing the supersolid phase in a system of dipolar bosons in an optical lattice.