Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Current scaling of the topological quantum phase transition between a
  quantum anomalous Hall insulator and a trivial insulator   We report a current scaling study of a quantum phase transition between a
quantum anomalous Hall insulator and a trivial insulator on the surface of a
heterostructure film of magnetic topological insulators. The transition was
observed by tilting the magnetization while measuring the Hall conductivity
$\sigma_{xy}$. The transition curves of $\sigma_{xy}$ taken under various
excitation currents cross each other at a single point, exemplifying a quantum
critical behavior of the transition. The slopes of the transition curves follow
a power law dependence of the excitation current, giving a scaling exponent.
Combining with the result of the previous temperature scaling study, critical
exponents $\nu$ for the localization length and $p$ for the coherence length
are separately evaluated as $\nu$ = 2.8 $\pm$ 0.3 and $p$ = 3.3 $\pm$ 0.3.

30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ