Abstract

We propose a novel realization of Kondo physics with ultracold atomic gases. It is based on a Fermi sea of two different hyperfine states of one atom species forming bound states with a different species, which is spatially confined in a trapping potential. We show that different situations displaying Kondo physics can be realized when Feshbach resonances between the species are tuned by a magnetic field and the trapping frequency is varied. We illustrate that a mixture of 40K and 23Na atoms can be used to generate a Kondo-correlated state and that momentum resolved radio frequency spectroscopy can provide unambiguous signatures of the formation of Kondo resonances at the Fermi energy. We discuss how tools of atomic physics can be used to investigate open questions for Kondo physics, such as the extension of the Kondo screening cloud.

Highlights

  • We propose a novel realization of Kondo physics with ultracold atomic gases

  • The bound states energies should be very similar, since a difference of their energy will favor a certain polarization of the spin, like a magnetic field, which suppresses the Kondo effect

  • In the Supplementary Material (SM) we show that additional resonances of the confining potential can be employed to tune the system into the Kondo-correlated state [23, 24]

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Summary

Introduction

We propose a novel realization of Kondo physics with ultracold atomic gases. It is based on a Fermi sea of two different hyperfine states of one atom species forming bound states with a different species, which is spatially confined in a trapping potential. The essence of the Kondo effect is that at low temperature this electron spin forms a many-body bound state with the itinerant electrons and becomes magnetically screened. This generates a competing effect to the Kondo screening and leads to a transition to a magnetically ordered state of the spins.

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Conclusion

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