Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Second Landau Level Fractional Quantum Hall Effects in the Corbino
  Geometry   For certain measurements, the Corbino geometry has a distinct advantage over
the Hall and van der Pauw geometries, in that it provides a direct probe of the
bulk 2DEG without complications due to edge effects. This may be important in
enabling detection of the non-Abelian entropy of the 5/2 fractional quantum
Hall state via bulk thermodynamic measurements. We report the successful
fabrication and measurement of a Corbino-geometry sample in an ultra-high
mobility GaAs heterostructure, with a focus on transport in the second and
higher Landau levels. In particular, we report activation energy gaps of
fractional quantum Hall states, with all edge effects ruled out, and
extrapolate the conductivity prefactor from the Arrhenius fits. Our results
show that activated transport in the second Landau level remains poorly
understood. The development of this Corbino device opens the possibility to
study the bulk of the 5/2 state using techniques not possible in other
geometries.

10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th