Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Three-dimensional electronic structure of superconducting iron pnictides
  observed by angle-resolved photoemission spectroscopy   We have performed an angle-resolved photoemission spectroscopy (ARPES) study
of the undoped and electron-doped iron pnictides BaFe2\_{-x}CoxAs2 (Ba122)
(x=0, 0.14) and studied the Fermi surfaces (FSs) and band dispersions near the
Fermi level. The FS sheets we observed are consistent with the shrinkage of the
hole-like pockets around the Brillouin Zone (BZ) center and the expansion of
the electron pockets around the BZ corner in the electron-doped compound as
compared to the undoped parent compound. Band dispersions and FSs around the BZ
center strongly depend on the photon energy, indicating the three-dimensional
(3D) electronic structure. This observation suggests that the
antiferromagnetism and superconductivity in the pnictides may have to be
considered including the orbital-dependent 3D electronic structure, where FS
nesting is not necessarily strong.

23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math