A Model for Overscreened Kondo Effect in Ultracold Fermi Gas

Abstract

The feasibility of realizing overscreened Kondo effect in ultra-cold Fermi gas of atoms with spin $s\ge \frac{3}{2}$ in the presence of a localized magnetic impurity atom is proved realistic. Specifying to a system of ultra cold ${}^{22}$Na Fermi gas and a trapped ${}^{197}$Au impurity, the mechanism of exchange interaction between the Na and Au atoms is elucidated and the exchange constant is found to be antiferromagnetic. The corresponding exchange Hamiltonian is derived, and the Kondo temperature is estimated at the order of $1\mu$K. Within a weak-coupling renormalization group scheme, it is shown that the coupling renormalizes to the non-Fermi liquid fixed point.

9 pages, 5 figures

References in corpus (9)

• Many-Body Physics with Ultracold Gases
• Theory of ultracold Fermi gases
• Using photoemission spectroscopy to probe a strongly interacting Fermi gas
• The Equation of State of a Low-Temperature Fermi Gas with Tunable Interactions
• Evidence for Superfluidity of Ultracold Fermions in an Optical Lattice
• Pure Gas of Optically Trapped Molecules Created from Fermionic Atoms
• Observation of an Efimov-like resonance in ultracold atom-dimer scattering
• Observation of heteronuclear atomic Efimov resonances
• Cooling in strongly correlated optical lattices: prospects and challenges

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• Coqblin-Schrieffer Model for an Ultra-cold Gas of Ytterbium atoms with Metastable States
• Multipolar Kondo Effect in ${}^1$S${}_0$-${}^3$P${}_2$ Mixture of ${}^{173}$Yb Atoms
• Dissipative realization of Kondo models
• Efimov Enhanced Kondo Effect in Alkaline and Alkaline-Earth Atomic Gas Mixture
• Spin-Orbit Coupling and Topological States in $F=\frac{3}{2}$ Cold Fermi Gas
• Asymmetric Conductivity of the Kondo Effect in Cold Atomic Systems
• Fractional Local Moment and High Temperature Kondo Effect in Rashba-Fermi Gases
• Kondo Effect in a Spin-3/2 Fermi Gas
• A fully controllable Kondo system: Coupling a flux qubit and an ultracold Fermi gas