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.

18 pages, 9 figures

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• Response of Bose gases in time-dependent optical superlattices
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Cited by in corpus (4)

• Application of a multi-site mean-field theory to the disordered Bose-Hubbard model
• Effective spin model for interband transport in a Wannier-Stark lattice system
• Ultracold Bose gases in time-dependent 1D superlattices: response and quasimomentum structure
• Bose-Fermi-Hubbard model on a lattice with two nonequivalent sublattices