Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Detailed band structure of twinned and detwinned BaFe$_2$As$_2$ studied
  with angle-resolved photoemission spectroscopy   We study the band structure of twinned and detwinned BaFe$_2$As$_2$ using
angle-resolved photoemission spectroscopy (ARPES). The combination of
measurements in the ordered and normal state along four high-symmetry momentum
directions $\Gamma$/Z--X/Y enables us to identify the complex reconstructed
band structure in the ordered state in great detail. We clearly observe the
nematic splitting of the $d_{xz}$ and $d_{yz}$ orbitals as well as folding due
to magnetic order with a wave vector of $(\pi,\pi,\pi)$. We are able to assign
all observed bands. In particular we suggest an assignment of the electron
bands different from previous reports. The high quality spectra allow us to
achieve a comprehensive understanding of the band structure of BaFe$_2$As$_2$.

36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph