Localized magnetic moments with tunable spin exchange in a gas of ultracold fermions

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 ${}^{173}$Yb 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.

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• Two-orbital SU(N) magnetism with ultracold alkaline-earth atoms
• Quantum Walk in Position Space with Single Optically Trapped Atoms
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• Ultracold fermions and the SU(N) Hubbard model
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• Optical Lattice Induced Light Shifts in an Yb Atomic Clock
• Superfluidity of Interacting Bosonic Mixtures in Optical Lattices
• Possibility of an ultra-precise optical clock using the $6^1{S}_0\to 6^3{P}_0^o$ transition in ${}^{171,173}$Yb atoms held in an optical lattice
• Simultaneous dimerization and SU(4) symmetry breaking of 4-color fermions on the square lattice
• Dynamic polarizabilities and related properties of clock states of ytterbium atom
• Probing the Kondo Lattice Model with Alkaline Earth Atoms
• Creating State-Dependent Lattices for Ultracold Fermions by Magnetic Gradient Modulation
• Microscopic derivation of Hubbard parameters for cold atomic gases
• SU(3) orbital Kondo effect with ultracold atoms
• Realizing a Kondo-correlated state with ultracold atoms
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• Enhancing Kondo Coupling in Alkaline-Earth Atomic Gases with Confinement-induced Resonances in Mixed Dimensions
• Coqblin-Schrieffer Model for an Ultra-cold Gas of Ytterbium atoms with Metastable States

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