Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Kondo Insulators Modeled by the One Dimensional Anderson Lattice: A
  Numerical Renormalization Group Study   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.

1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph