SU(3) orbital Kondo effect with ultracold atoms

Area of Science:

• Atomic Physics
• Condensed Matter Physics
• Quantum Simulation

Background:

• The Kondo effect is a quantum mechanical phenomenon observed in magnetic impurities in metals.
• Realizing and controlling the Kondo effect in ultracold atom systems presents unique experimental challenges and opportunities.

Purpose of the Study:

• To propose a novel and simple scheme for realizing the Kondo effect in ultracold atom experiments.
• To investigate the SU(3) orbital Kondo effect arising from interactions between spinless fermions and impurity atoms.
• To explore the potential for observing this effect and its implications for Kondo physics.

Main Methods:

• Utilizing a Fermi sea of spinless fermions interacting with a confined impurity atom of a different species.
• Tuning interspecies attraction with s-wave Feshbach resonance to form bound dimers.
• Analyzing many-body scatterings involving dimers and surrounding fermions, leading to angular momentum exchange.
• Investigating Kondo singlet formation and anisotropic interdimer interactions.

Main Results:

• Demonstration of the SU(3) orbital Kondo effect in a tunable ultracold atom system.
• Identification of a universal leading exponent for the Kondo temperature (TK∝exp[-π/(3apkF3)]).
• Elucidation of Kondo singlet formation at zero temperature and anisotropic interdimer interactions.

Conclusions:

• The proposed scheme offers a viable pathway to experimentally realize and study the Kondo effect in ultracold atoms.
• The observed Kondo effect can potentially be detected through atom loss measurements or radio-frequency spectroscopy.
• This work provides a foundation for extending Kondo physics studies to dense Kondo lattices and unresolved theoretical aspects.