Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Consistent picture of the octet-nodal gap and its evolution with doping
  in heavily overdoped Ba$_{1-x}$K$_{x}$Fe$_{2}$As$_{2}$   We investigate the pairing symmetry in heavily overdoped
Ba$_{1-x}$K$_{x}$Fe$_{2}$As$_{2}$ based on the spin-fluctuation mechanism. The
exotic octet nodes of the superconducting gap and the unusual evolution of the
gap with doping observed by the recent experiments are well explained in a
unified manner. We demonstrate that the scatterings of electrons on the Fermi
patches is mainly responsible for the incommensurate spin fluctuations and
consequently the Fermi-surface-dependent multi-gap structure, since the Fermi
level is close to the flat band. In addition, we find that a $d$-wave pairing
state will prevail over the s-wave pairing state around the Lifshitz transition
point.

8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci