Strong coupling expansion for the Bose-Hubbard and the Jaynes-Cummings lattice model

Details Strong coupling expansion for the Bose-Hubbard and the Jaynes-Cummings lattice model Strong coupling expansion for the Bose-Hubbard and the Jaynes-Cummings lattice model

2011-05-12

arxiv.org/abs/1105.2418v5

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

16 pages, 26 figures

Scientific paper

A strong coupling expansion, based on the Kato-Bloch perturbation theory, which has recently been proposed by Eckardt et al. [Phys. Rev. B 79, 195131] and Teichmann et al. [Phys. Rev. B 79, 224515] is implemented in order to study various aspects of the Bose-Hubbard and the Jaynes-Cummings lattice model. The approach, which allows to generate numerically all diagrams up to a desired order in the interaction strength is generalized for disordered systems and for the Jaynes-Cummings lattice model. Results for the Bose-Hubbard and the Jaynes-Cummings lattice model will be presented and compared with results from VCA and DMRG. Our focus will be on the Mott insulator to superfluid transition.

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