Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2003-06-06
Phys. Rev. Lett. 92, 050401 (2004)
Physics
Condensed Matter
Other Condensed Matter
4 pages, 1 eps figure, misprints corrected
Scientific paper
10.1103/PhysRevLett.92.050401
A mixture of ultracold bosons and fermions placed in an optical lattice constitutes a novel kind of quantum gas, and leads to phenomena, which so far have been discussed neither in atomic physics, nor in condensed matter physics. We discuss the phase diagram at low temperatures, and in the limit of strong atom-atom interactions, and predict the existence of quantum phases that involve pairing of fermions with one or more bosons, or, respectively, bosonic holes. The resulting composite fermions may form, depending on the system parameters, a normal Fermi liquid, a density wave, a superfluid liquid, or an insulator with fermionic domains. We discuss the feasibility for observing such phases in current experiments.
Baranov Mikhail A.
Fehrmann H.
Lewenstein Maciej
Santos Laércio
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