Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Symmetry in the insulator - quantum Hall - insulator transitions
  observed in a Ge/SiGe quantum well   We examine the magnetic field driven insulator-quantum Hall-insulator
transitions of the two dimensional hole gas in a Ge/SiGe quantum well. We
observe direct transitions between low and high magnetic field insulators and
the $\nu=1$ quantum Hall state. With increasing magnetic field, the transitions
from insulating to quantum Hall and quantum Hall to insulating are very similar
with respect to their transport properties. We address the temperature
dependence around the transitions and show that the characteristic energy scale
for the high field transition is larger.

28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math