Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Unveiling the impurity band inducing ferromagnetism in magnetic
  semiconductor (Ga,Mn)As   (Ga,Mn)As is a paradigm diluted magnetic semiconductor which shows
ferromagnetism induced by doped hole carriers. With a few controversial models
emerged from numerous experimental and theoretical studies, the mechanism of
the ferromagnetism in (Ga,Mn)As still remains a puzzling enigma. In this
Letter, we use soft x-ray angle-resolved photoemission spectroscopy to
positively identify the ferromagnetic Mn 3d-derived impurity band in (Ga,Mn)As.
The band appears hybridized with the light-hole band of the host GaAs. These
findings conclude the picture of the valence band structure of (Ga,Mn)As
disputed for more than a decade. The non-dispersive character of the IB and its
location in vicinity of the valence-band maximum indicate that the Mn
3d-derived impurity band is formed as a split-off Mn-impurity state predicted
by the Anderson impurity model. Responsible for the ferromagnetism in (Ga,Mn)As
is the transport of hole carriers in the impurity band.

24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin