Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coincidence of Superparamagnetism and perfect quantization in the
  Quantum Anomalous Hall state   Topological insulators doped with transition metals have recently been found
to host a strong ferromagnetic state with perpendicular to plane anisotropy as
well as support a quantum Hall state with edge channel transport, even in the
absence of an external magnetic field. It remains unclear however why a robust
magnetic state should emerge in materials of relatively low crystalline quality
and dilute magnetic doping. Indeed, recent experiments suggest that the
ferromagnetism exhibits at least some superparamagnetic character. We report on
transport measurements in a sample that shows perfect quantum anomalous Hall
quantization, while at the same time exhibits traits in its transport data
which suggest inhomogeneities. We speculate that this may be evidence that the
percolation path interpretation used to explain the transport during the
magnetic reversal may actually have relevance over the entire field range.

13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
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
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph