Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hubbard chain with a Kondo impurity   A Bethe Ansatz solution of a (modified) Hubbard chain with a Kondo impurity
of arbitrary spin S at a highly symmetric line of parameter space is proposed
and explored. Our results confirm the existence of a strong-coupling (line of)
fixed-point(s) with ferromagnetic Kondo coupling as first hypothetized by
Furusaki and Nagaosa on the basis of perturbative renormalization group
calculations. For on-site Hubbard repulsion and ferromagnetic Kondo exchange,
the ground state has spin S-1/2, i.e., is a singlet when S=1/2. The
contributions of the impurity to the magnetic susceptibility and
low-temperature specific heat are discussed. While the Wilson ratio is unity in
the half-filled band, it is found to be a function of density and interaction
away from half-filling.

16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc