Fermion-Mediated Interactions Between Bosons in a Quantum Degenerate $^{133}$Cs-$^6$Li Bose-Fermi Mixture

POSTER

Abstract

We observe fermion-mediated interactions between bosonic atoms of $^{133}$Cs embedded in a degenerate Fermi gas (DFG) of $^6$Li atoms. The mediated interaction is the spinless analog of the RKKY (Ruderman-Kittel-Kasuya-Yosida) mechanism. Deep in quantum degeneracy, the strong mass imbalance and the different quantum statistics between two species lead to the Bose-Einstein Condensate (BEC) that is fully immersed in the DFG. From in situ imaging of the mixture, we observe an effective attraction between bosons and the formation of Bose-Fermi solitions, in full consistency with the predictions. In addition, we perform a measurement of the BEC's dipole oscillation near an interspecies Feshbach resonance. The interspecies interactions modify trapping frequency and damping rate of the BEC in the presence of the DFG.

Authors

  • Geyue Cai

    James Franck Institute, Enrico Fermi Institute, Department of Physics, University of Chicago, University of Chicago

  • Krutik Patel

    James Franck Institute, Enrico Fermi Institute, Department of Physics, University of Chicago

  • B.J. DeSalvo

    James Franck Institute, Enrico Fermi Institute, Department of Physics, University of Chicago, University of Chicago

  • Cheng Chin

    University of Chicago, James Franck Institute, Enrico Fermi Institute, Department of Physics, University of Chicago, James Franck Institute, Enrico Fermi Institute, and Department of Physics, University of Chicago, Department of Physics, University of Chicago