Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bipartite electronic superstructures in the vortex core of
  Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$   A magnetic field applied to type-II superconductors introduces quantized
vortices that locally quench superconductivity, providing a unique opportunity
to investigate electronic orders that may compete with superconductivity. This
is especially true in cuprate superconductors in which mutual relationships
among superconductivity, pseudogap, and broken-spatial-symmetry states have
attracted much attention. Here we observe energy and momentum dependent
bipartite electronic superstructures in the vortex core of
Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ using spectroscopic-imaging scanning
tunneling microscopy (SI-STM). In the low-energy range where the nodal
Bogoliubov quasiparticles are well-defined, we show that the quasiparticle
scattering off vortices generates the electronic superstructure known as
"vortex checkerboard". In the high-energy region where the pseudogap develops,
vortices amplify the broken-spatial-symmetry patterns that preexist in zero
field. These data reveal canonical d-wave superconductivity near the node, yet
competition between superconductivity and broken-spatial-symmetry states near
the antinode.

9
The categories of this paper are: nlin
2
The categories of this paper are: math
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
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The categories of this paper are: econ
27
The categories of this paper are: comp-gas