Bose-Fermi mixtures in 1D optical superlattices
Abstract
The zero temperature phase diagram of binary boson-fermion mixtures in two-colour superlattices is investigated. The eigenvalue problem associated with the Bose-Fermi-Hubbard Hamiltonian is solved using an exact numerical diagonalization technique, supplemented by an adaptive basis truncation scheme. The physically motivated basis truncation allows to access larger systems in a fully controlled and very flexible framework. Several experimentally relevant observables, such as the matter-wave interference pattern and the condensatefraction, are investigated in order to explore the rich phase diagram. At symmetric half filling a phase similar to the Mott-insulating phase in a commensurate purely bosonic system is identified and an analogy to recent experiments is pointed out. Furthermore a phase of complete localization of the bosonic species generated by the repulsive boson-fermion interaction is identified. These localized condensates are of a different nature than the genuine Bose-Einstein condensates in optical lattices.
Keywords
Cite
@article{arxiv.cond-mat/0606255,
title = {Bose-Fermi mixtures in 1D optical superlattices},
author = {F. Schmitt and M. Hild and R. Roth},
journal= {arXiv preprint arXiv:cond-mat/0606255},
year = {2007}
}
Comments
18 pages, 9 figures