Asymmetric Conductivity of the Kondo Effect in Cold Atomic Systems

TL;DR

This paper proposes a method to detect Kondo physics in cold atomic systems by observing asymmetric conductivity caused by spin-exchange interactions near a confinement-induced resonance, with potential experimental verification.

Contribution

It introduces a novel approach to simulate and identify Kondo effects in cold atoms through conductivity asymmetry measurements.

Findings

Conductivity exhibits asymmetry near the spin-exchange resonance.

Magnetic fields suppress the asymmetry, restoring symmetry in conductivity.

The proposed method is feasible with current experimental setups.

Abstract

Motivated by recent theoretical and experimental advances in quantum simulations using alkaline earth(AE) atoms, we put forward a proposal to detect the Kondo physics in a cold atomic system. It has been demonstrated that the intrinsic spin-exchange interaction in AE atoms can be significantly enhanced near a confinement-induced resonance(CIR), which facilitates the simulation of Kondo physics. Since the Kondo effect appears only for antiferromagnetic coupling, we find that the conductivity of such a system exhibits an asymmetry across a resonance of spin-exchange interaction. The asymmetric conductivity can serve as the smoking gun evidence for Kondo physics in the cold atom context. When an extra magnetic field ramps up, the spin-exchange process near the Fermi surface is suppressed by Zeeman energy and the conductivity becomes more and more symmetric. Our results can be verified in the current experimental setup.