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- W4379780704 abstract "We investigate the excitation spectrum and momentum distribution of the ionic Bose-Hubbard model by the standard basis operator method. We derive Green's functions in the random phase approximation in Mott insulator, superfluid, charge density wave, and supersolid phases. The excitation spectrum has gapped modes and gapless Goldstone modes in the superfluid and supersolid phases. We show that the momentum distribution has a peak at the zone corner in the supersolid phase and the charge density wave phase close to the phase boundary. In addition, we demonstrate that the momentum distribution can be explained by the excitation spectrum and spectral weights of hole excitation modes." @default.
- W4379780704 created "2023-06-09" @default.
- W4379780704 creator A5070833749 @default.
- W4379780704 date "2023-06-20" @default.
- W4379780704 modified "2023-10-02" @default.
- W4379780704 title "Excitation spectrum and momentum distribution of the ionic Bose–Hubbard model" @default.
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- W4379780704 doi "https://doi.org/10.1088/1402-4896/acdcc6" @default.
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