Atomic Bose-Fermi mixed condensates with Boson-Fermion quasi-bound cluster states

نویسندگان

  • H. Yabu
  • P. Schuck
چکیده

The boson-fermion atomic bound states (composite fermion) and their roles for the phase structures are studied in a bose-fermi mixed condensate of atomic gas in finite temperature and density. The two-body scattering equation is formulated for a bosonfermion pair in the mixed condensate with the Yamaguchi-type potential. By solving the equation, we evaluate the binding energy of a composite fermion, and show that it has small T -dependence in the physical region, because of the cancellation of the bosonand fermionstatistical factors in the equation. We also calculate the phase structure of the BF mixed condensate under the equilibrium B + F ↔ BF, and discuss the role of the composite fermions: the competitions between the degenerate state of the composite fermions and the Bose-Einstein condensate (BEC) of isolated bosons. The criterion for the BEC realization is obtained from the algebraically-derived phase diagrams at T = 0.

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تاریخ انتشار 2004