Abstract
We study collective excitations in the Bose–Fermi mixed condensate of atomic gases with large excess of bosons based on the self-consistent Hartree–Fock and Random Phase Approximation. We investigate response of the system to a monopole type external field, and find that the fermionic strength is concentrated in a single collective state for a repulsive boson–fermion interaction. The dynamical structure factor for this state shows that fermions are correlated through the Bose condensate.
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