Localized Magnetic Moments with Tunable Spin Exchange in a Gas of Ultracold Fermions
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1.
California Institute of Technology
Abstract
We report on the experimental realization of a state-dependent lattice for a two-orbital fermionic quantum gas with strong interorbital spin exchange. In our state-dependent lattice, the ground and metastable excited electronic states of ¹⁷³Yb take the roles of itinerant and localized magnetic moments, respectively. Repulsive on-site interactions in conjunction with the tunnel mobility lead to spin exchange between mobile and localized particles, modeling the coupling term in the well-known Kondo Hamiltonian. In addition, we find that this exchange process can be tuned resonantly by varying the on-site confinement. We attribute this to a resonant coupling to center-of-mass excited bound states of one interorbital scattering channel.
Copyright and License
© 2018 American Physical Society.
Acknowledgement
We acknowledge the valuable and helpful discussions with Hui Zhai, Eugene Demler, Marton Kanász-Nagy, Peng Zhang, Meera M. Parish, Jesper Levinsen, Jan von Delft, Seung-Sup Lee, and Frank Deuretzbacher. This work was supported by the European Research Council through the synergy grant UQUAM and by the European Union’s Horizon 2020 funding. N. D. O. acknowledges funding from the International Max Planck Research School for Quantum Science and Technology.
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Additional details
- ISSN
- 1079-7114
- European Research Council
- 319278