Coqblin-Schrieffer model for an ultracold gas of ytterbium atoms with metastable state

Article

关键词: FERMI GAS;    THERMOELECTRIC-POWER;    CONDENSED MATTER;    NEUTRAL ATOMS;    PHYSICS;    CERIUM;    THERMODYNAMICS;    COLLISIONS;    HEAT;   

DOI  :  10.1103/PhysRevB.93.115143

来源: SCIE

【 摘 要 】

Motivated by the impressive recent advance in manipulating cold ytterbium atoms, we explore and substantiate the feasibility of realizing the Coqblin-Schrieffer model in a gas of cold fermionic Yb-173 atoms. Making use of different AC polarizabillity of the electronic ground state (electronic configuration S-1(0)) and the long lived metastable state (electronic configuration P-3(0)), it is substantiated that the latter can be localized and serve as a magnetic impurity while the former remains itinerant. The exchange mechanism between the itinerant S-1(0) and the localized P-3(0) atoms is analyzed and shown to be antiferromagnetic. The ensuing SU(6) symmetric Coqblin-Schrieffer Hamiltonian is constructed, and, using the calculated exchange constant J, perturbative renormalization group (RG) analysis yields the Kondo temperature T-K that is experimentally accessible. A number of thermodynamic measurable observables are calculated in the weak-coupling regime T > T-K (using perturbative RG analysis) and in the strong-coupling regimeT < T-K (employing known Bethe ansatz techniques).

【 授权许可】

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