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arXiv · 1708.03810

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

Luis Riegger·Nelson Darkwah Oppong·Moritz Höfer·Diogo Rio Fernandes·Immanuel Bloch·Simon Fölling
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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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Luis Riegger, Nelson Darkwah Oppong, Moritz Höfer, Diogo Rio Fernandes, Immanuel Bloch, Simon Fölling. 2017-08-12. Localized magnetic moments with tunable spin exchange in a gas of ultracold fermions. https://doi.org/10.1103/physrevlett.120.143601

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