A three-site Bose-Fermi ring with a few atoms

Santiago F. Caballero-Benítez*, Elena A. Ostrovskaya

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    1 Citation (Scopus)


    We investigate a three-site ring system with a small number of ultracold, quantum degenerate bosons and fermions. By means of the exact diagonalization of the Bose-Fermi-Hubbard Hamiltonian, we show that the symmetry of the ground state configuration is a function of both the boson-boson and the inter-species interaction in the system. The phase diagram of the system, constructed by computing the exact two-body spatial correlations, reveals nontrivial insulating phases that exist even in the strong bosonic tunnelling limit and for incommensurate filling of bosons. These insulating phases are due to the inter-species interactions in the system and are not necessarily accompanied by the suppression of the particle number fluctuations.

    Original languageEnglish
    Article number135301
    JournalJournal of Physics B: Atomic, Molecular and Optical Physics
    Issue number13
    Publication statusPublished - 14 Jul 2011


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