Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tunneling interstitial impurity in iron-chalcogenide based
  superconductors   A pronounced local in-gap zero-energy bound state (ZBS) has been observed by
recent scanning tunneling microscopy (STM) experiments on the interstitial Fe
impurity (IFI) and its nearest-neighboring (nn) sites in
$\mathrm{FeTe_{0.5}Se_{0.5}}$ superconducting (SC) compound. By introducing a
new impurity mechanism, the so-called tunneling impurity, and based on the
Bogoliubove-de Gennes (BDG) equations we investigated the low-lying energy
states of the IFI and the underlying Fe-plane. We found the peak of ZBS does
not shift or split in a magnetic field as long as the tunneling parameter
between IFI and the Fe-plane is sufficiently small and the Fe-plane is deep in
the SC state. Our results are in good agreement with the experiments. We also
predicted that modulation of spin density wave (SDW), or charge density wave
(CDW) will suppress the intensity of the ZBS.

27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat