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

Riegger, L.; Oppong, N. Darkwah; Höfer, M.; Fernandes, D. R.; Bloch, I. und Fölling, S. (2018): Localized Magnetic Moments with Tunable Spin Exchange in a Gas of Ultracold Fermions. In: Physical Review Letters, Bd. 120, Nr. 14, 143601

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 Yb-173 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.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 0031-9007
• Sprache: Englisch