Effect of the repulsion interaction on the ground-state of the Kondo lattice model with a superlattice potential

21st Latin American Symposium on Solid State Physics

Silva-Valencia, J.^1 ; Franco, R.^1 ; Figueira, M.S.^2

Departamento de Física, Universidad Nacional de Colombia, Bogotá, Colombia^1

Instituto de Física, Universidade Federal Fluminense, Av. Litorânea s/n, Rio de Janeiro, 24210-346 Niterói, Brazil^2

关键词: Antiferromagnetic exchange;    Antiferromagnetic state;    Density matrix renormalization group methods;    Kondo lattice model;    Quantum critical points;    Repulsion interactions;    Spin liquid state;    Structure factors;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/480/1/012015/pdf
DOI  :  10.1088/1742-6596/480/1/012015

来源: IOP

【 摘 要 】

We investigate the ground-state of a new Kondo lattice model, where the free carriers interact repulsively between them and undergo an external superlattice potential. This model can be simulated with171Yb atoms confined in optical lattices. We use the density matrix renormalization group method to evaluate the charge and spin gaps, and the structure factors. We found that the ground-state evolves from a Kondo spin liquid state to a charge-gapped antiferromagnetic state with zero spin gap, when the antiferromagnetic exchange increases. Also, we verify that the quantum critical point varies linearly with the repulsion and the exchange.