Strong-coupling expansion for the spin-1 Bose-Hubbard model [PDF]
Takashi KimuraWe perform a strong-coupling expansion up to the third order of the hopping parameter $t$ for the spin-1 Bose-Hubbard model with antiferromagnetic interaction. We examine the validity of the expansion by comparing it with the mean-field theory. Moreover, we apply a few extrapolation methods up to the infinite order of $t$ to improve our results.View original: http://arxiv.org/abs/1210.2322
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