Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Single-particle spectrum for a model of fermions interacting with
  two-level local excitations on a lattice: A dynamical CPA approach   The problem of motion of a single electron interacting with a periodic
lattice of two-level systems is investigated within a spinless fermion model.
The Green's function is calculated in a single-site dynamical coherent
potential approximation which is equivalent to DMFT. The picture of
one-electron density of states is obtained for various values of the tunnel
splitting and coupling between the electron and two-level system. The
occurrence of a band splitting with increase of the coupling is demonstrated.

11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an