Asymmetric Conductivity as a Manifestation of Kondo Effect in Cold Atom

Motivated by recent theoretical and experimental advances in the quantum simulation of alkaline
earth(AE) atoms, we raise a proposal to detect the Kondo physics in cold atom 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 for Kondo physics in the cold-atom context. When
an extra magnetic field ramps up, the spin-exchange process near Fermi surface is suppressed by
Zeeman energy and hence the conductivity becomes more and more symmetric. Our results can be
verified in the current experimental setup.