Fermi-Bose mixture across a Feshbach resonance (Articolo in rivista)

Type
Label
  • Fermi-Bose mixture across a Feshbach resonance (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Alternative label
  • Salasnich, L; Toigo, F (2007)
    Fermi-Bose mixture across a Feshbach resonance
    in Physical review. A
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Salasnich, L; Toigo, F (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 75 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR INFM, Unita Milano, I-20133 Milan, Italy; CNISM, Unita Milano, I-20133 Milan, Italy; Univ Padua, Dipartimento Fis G Galilei, I-35131 Padua, Italy; Univ Padua, CNISM, I-35131 Padua, Italy (literal)
Titolo
  • Fermi-Bose mixture across a Feshbach resonance (literal)
Abstract
  • We study a dilute mixture of degenerate bosons and fermions across a Feshbach resonance of the Fermi-Fermi scattering length a(F). This scattering length is renormalized by the boson-induced interaction between fermions and its value is crucial to determine the phase diagram of the system. For the mixture in a box and a positive Bose-Fermi scattering length, we show that there are three possibilities: A single uniform mixed phase, a purely fermionic phase coexisting with a mixed phase, and a purely fermionic phase coexisting with a purely bosonic one. As 1/a(F) is increased from a negative value to the Feshbach resonance (1/a(F)=0), the region of pure separation increases and the other two regions are strongly reduced. Above the Feshbach resonance (1/a(F)=0), pairs of Fermi atoms become Bose-condensed molecules. We find that these molecules are fully spatially separated from the bosonic atoms when 1/a(F) exceeds a critical value. For a negative Bose-Fermi scattering length we deduce the condition for collapse, which coincides with the onset of dynamical instability of the fully mixed phase. We consider also the mixture in a harmonic trap and determine the conditions for partial demixing, full demixing, and collapse. The experimental implications of our results are investigated by analyzing mixtures of Li-6-Na-23 and K-40-Rb-87 atoms. (literal)
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