The ground state of the bose-hubbard model is a supersolid

Details The ground state of the bose-hubbard model is a supersolid The ground state of the bose-hubbard model is a supersolid

2011-02-23

arxiv.org/abs/1102.4797v1

Physics

Condensed Matter

Quantum Gases

Scientific paper

The Bose-Hubbard model is well-defined description of a Bose solid which may be realistic for cold atoms in a periodic optical lattice. We show that contrary to accepted theories it can never have as a ground state a perfect Mott insulator solid and that it has a low-energy spectrum of vortex-like phase fluctuations. Whether the ground state is necessarily commensurate remains an open question.

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