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Kondo Insulators Modeled by the One Dimensional Anderson Lattice: A Numerical Renormalization Group Study

M. Guerrero·Clare C. Yu
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Abstract

In order to better understand Kondo insulators, we have studied both the symmetric and asymmetric Anderson lattices at half-filling in one dimension using the density matrix formulation of the numerical renormalization group. We have calculated the charge gap, spin gap and quasiparticle gap as a function of the repulsive interaction U using open boundary conditions for lattices as large as 24 sites. We find that the charge gap is larger than the spin gap for all U for both the symmetric and asymmetric cases. RKKY interactions are evident in the f-spin-f-spin correlation functions at large U in the symmetric case, but are suppressed in the asymmetric case as the f-level approaches the Fermi energy. This suppression can also be seen in the staggered susceptibility and it is consistent with neutron scattering measurements in CeNiSn.

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M. Guerrero, Clare C. Yu. 1995-03-01. Kondo Insulators Modeled by the One Dimensional Anderson Lattice: A Numerical Renormalization Group Study. https://doi.org/10.1103/physrevb.51.10301

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