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arXiv:2506.02579 · Physical Review A

Confinement-induced resonances for the creation of quasi-one-dimensional ultracold gases of alkali–alkaline-earth dimers

Lorenzo Oghittu, Premjith Thekkeppatt, Nirav P. Mehta, Seth T. Rittenhouse, N. J. van Druten, Florian Schreck, Arghavan Safavi-Naini

Published Sep 12, 2025• 1 citation
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Abstract

The authors investigate the role of confinement-induced resonances in low-dimensional ultracold atomic mixtures for the formation of weakly bound dimers. They identify viable pathways for creating RbSr molecules, which could open the door to producing other molecules made up of alkali- and alkaline-earth-metal atoms.
DOI
10.1103/3m6z-t6pb

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The Kondo effect describes the spin-exchange interaction between localized impurities and itinerant fermions. The ultracold alkaline-earth atomic gas provides a natural platform for quantum simulation of the Kondo model, utilizing its long-lived clock state and the nuclear-spin exchange interaction between clock state and ground state. One of the key issue now is whether the Kondo temperature can be high enough to be reached in current experiments, for which we have proposed to use transverse confinement to confine atoms into a one-dimensional tube and to use the confinement-induced resonance to enhance Kondo coupling. In this work, we further consider the (1+0)(1+0)(1+0)-dimensional scattering problem when the clock state is further confined by an axial harmonic confinement. We show that this axial confinement for the clock-state atoms not only plays a role for localizing them, but can also act as an additional control knob to reach the confinement-induced resonance. We show that, in the presence of both the transverse and the axial confinements, the confinement-induced resonance can be reached in the practical conditions and the Kondo effect can be attainable in this system.