Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discovery of two-dimensional anisotropic superconductivity at KTaO$_3$
  (111) interfaces   The unique electronic structure found at interfaces between materials can
allow unconventional quantum states to emerge. Here we observe
superconductivity in electron gases formed at interfaces between (111) oriented
KTaO$_3$ and insulating overlayers of either EuO or LaAlO$_3$. The
superconducting transition temperature, approaching 2.2 K, is about one order
of magnitude higher than that of the LaAlO$_3$/SrTiO$_3$ system. Strikingly,
similar electron gases at (001) KTaO$_3$ interfaces remain normal down to 25
mK. The critical field and current-voltage measurements indicate that the
superconductivity is two dimensional. Higher mobility EuO/KTaO$_3$ (111)
samples show a large in-plane anisotropy in transport properties at low
temperatures prior to onset of superconductivity, suggesting the emergence of a
stripe like phase where the superconductivity is nearly homogeneous in one
direction, but strongly modulated in the other.

24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol