The low-energy theory for the Bose-Hubbard model and the normal ground state of bosons

Details The low-energy theory for the Bose-Hubbard model and the normal ground state of bosons The low-energy theory for the Bose-Hubbard model and the normal ground state of bosons

1999-06-09

arxiv.org/abs/cond-mat/9906136v1

Physical Review B, vol. 60, p 14503 (1999)

Physics

Condensed Matter

Superconductivity

8 pages, LaTex, one postscript figure

Scientific paper

10.1103/PhysRevB.60.14503

A bosonic realization of the SU(2) Lie algebra and of its vector representation is constructed, and an effective low-energy description of the Bose-Hubbard model in the form of anisotropic theory of quantum rotors is proposed and discussed. A possibility of a normal zero-temperature bosonic phase with neither crystalline nor superfluid order around the tip of the checkerboard-solid lobe at half-integer fillings is examined.

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