Superfluid to Mott-insulator transition in Bose-Hubbard models
arXiv:0705.2684 · doi:10.1103/PhysRevLett.99.056402
Abstract
We study the superfluid-insulator transition in Bose-Hubbard models in one-, two-, and three-dimensional cubic lattices by means of a recently proposed variational wave function. In one dimension, the variational results agree with the expected Berezinskii-Kosterlitz-Thouless scenario of the interaction-driven Mott transition. In two and three dimensions, we find evidences that, across the transition,most of the spectral weight is concentrated at high energies, suggestive of pre-formed Mott-Hubbard side-bands. This result is compatible with the experimental data by Stoferle et al. [Phys. Rev. Lett. 92, 130403 (2004)].
4 pages, 4 figures, based on cond-mat/0611306
References in corpus (2)
Cited by in corpus (6)
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- Zero-temperature phase transitions in dilute bosonic superfluids on a lattice