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  • Title: Do mixtures of bosonic and fermionic atoms adiabatically heat up in optical lattices?
    Author: Cramer M, Ospelkaus S, Ospelkaus C, Bongs K, Sengstock K, Eisert J.
    Journal: Phys Rev Lett; 2008 Apr 11; 100(14):140409. PubMed ID: 18518014.
    Abstract:
    Mixtures of bosonic and fermionic atoms in optical lattices provide a promising arena to study strongly correlated systems. In experiments realizing such mixtures in the quantum-degenerate regime the temperature is a key parameter. We investigate the intrinsic heating and cooling effects due to an entropy-preserving raising of the optical lattice, identify the generic behavior valid for a wide range of parameters, and discuss it quantitatively for the recent experiments with 87Rb and 40K atoms. In the absence of a lattice, we treat the bosons in the Hartree-Fock-Bogoliubov-Popov approximation, including the fermions in a self-consistent mean-field interaction. In the presence of the full three-dimensional lattice, we use a strong coupling expansion. We find the temperature of the mixture in the lattice to be always higher than for the pure bosonic case, shedding light onto a key point in the analysis of recent experiments.
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