Repulsion-attraction asymmetry in the Bose-Fermi-Hubbard model

Stasyuk, I. V.; Krasnov,

doi:10.1016/j.physb.2018.09.026

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2019

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“…The appearance of fermions worsens the conditions for the BE-condensate existence on the background of unoccupied fermion states. At the same time, the existence of fermions stimulates the appearance of the BE-condensate of the other type [8]. For example, in [9] and [10], the mixture of fermionic 40 K and bosonic 87 Rb atoms in a three-dimensional optical lattice was studied and it was observed that an increasing admixture of the fermionic species diminishes the phase coherence of the bosonic atoms.…”

Section: Discussionmentioning

confidence: 99%

Bose-Fermi-Hubbard model in the truncated Hilbert space limit

Krasnov¹,

Stasyuk²

2019

Condens. Matter Phys.

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It is shown that in the Bose-Fermi-Hubbard model which is used for a description of the ultracold atomic bosonfermion mixture in the optical lattice, the n B 2 restriction enables one to analyze a more general case of separated lobes Mott insulator in comparison with the case of n B 1 (hard-core bosons). It also showed that the restriction to no more than 2 bosons on site is enough to comprehend the structure of (µ, |t 0 |) diagrams at arbitrary n b values with an account of a possibility of the 1st order phase transition.

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Section: Discussionmentioning

confidence: 99%