Kondo Effect in Alkali-Earth Atomic Gases with Confinement-induced Resonance

TL;DR

This paper proposes using confinement-induced resonance to enhance the spin-exchange interaction in alkali-earth atomic gases, enabling the observation of the Kondo effect at experimentally accessible temperatures.

Contribution

It introduces a method to significantly increase the Kondo temperature in atomic gases via CIR, facilitating experimental realization of the Kondo effect.

Findings

Kondo temperature can be increased near CIR

Renormalization group analysis confirms enhancement

Potential for experimental observation of Kondo effect

Abstract

Alkali-earth atoms have a long-lived electronic excited state, which can be localized in the Fermi sea of ground state atoms by an external potential and serve as magnetic impurities, due to the spin-exchange interaction between the excited and the ground state atoms. This can give rise to the Kondo effect. However, in order to achieve this effect in current atomic gas experiment, it requires the Kondo temperature to be increased to a sizable portion of the Fermi temperature. In this letter we propose that the spin-exchange interaction can be strongly enhanced by utilizing the confinement-induced resonance (CIR). We analyze this system by the renormalization group approach, and we show that nearby a CIR, the Kondo temperature can indeed be increased to the regime attainable by current experiments.