Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Highly anisotropic and two-fold symmetric superconducting gap in
  nematically ordered FeSe$_{0.93}$S$_{0.07}$   FeSe exhibits a novel ground state in which superconductivity coexists with a
nematic order in the absence of any long-range magnetic order. Here we report
an angle-resolved photoemission study on the superconducting gap structure in
the nematic state of FeSe$_{0.93}$S$_{0.07}$, without the complication caused
by Fermi surface reconstruction induced by magnetic order. We found that the
superconducting gap shows a pronounced 2-fold anisotropy around the elliptical
hole pocket near the Z point of the Brillouin zone, with gap minima at the
endpoints of its major axis, while no detectable gap was observed around the
zone center and zone corner. The large anisotropy and nodal gap distribution
demonstrate the substantial effects of the nematicity on the superconductivity,
and thus put strong constraints on the current theories.

9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas