Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cross effect of Coulomb correlation and hybridization in the occurrence
  of ferromagnetism in two shifted band transition metals   In this work we discuss the occurrence of ferromagnetism in transition-like
metals. The metal is represented by two hybridized($V$) and shifted
$(\epsilon_s$) bands one of which includes Hubbard correlation whereas the
other is uncorrelated. The starting point is to transform the original
Hamiltonian into an effective one. Only one site retains the full correlation
(U) while in the others the correlations are represented by an effective field,
the self-energy(single-site approximation). This field is self-consistently
determined by imposing the translational invariance of the problem. Thereby one
gets an exchange split quasi-particle density of states and then an
electron-spin polarization for some values of the parameters $(U,V, \alpha,
\epsilon_s)$, $\alpha$ being the ratio of the effective masses of the two bands
and of the occupation number $n$.

18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
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The categories of this paper are: eess
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The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat