Localized Magnetic Moments with Tunable Spin Exchange in a Gas of Ultracold Fermions

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 mo...

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Bibliographic Details
Published in:Physical review letters 2018-04, Vol.120 (14), p.143601-143601, Article 143601
Main Authors: Riegger, L, Darkwah Oppong, N, Höfer, M, Fernandes, D R, Bloch, I, Fölling, S
Format: Article
Language:English
Subjects:
Coupling
Electron states
Fermions
Magnetic moments
Particle spin
Spin exchange
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.120.143601