Superfluid to Mott-insulator transition in Bose-Hubbard models
Strongly Correlated Electrons
2009-11-13 v1
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)].
Keywords
Cite
@article{arxiv.0705.2684,
title = {Superfluid to Mott-insulator transition in Bose-Hubbard models},
author = {Manuela Capello and Federico Becca and Michele Fabrizio and Sandro Sorella},
journal= {arXiv preprint arXiv:0705.2684},
year = {2009}
}
Comments
4 pages, 4 figures, based on cond-mat/0611306