Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Universal Prefactor of Activated Conductivity in the Quantum Hall Effect   The prefactor of the activated dissipative conductivity in a plateau range of
the quantum Hall effect is studied in the case of a long-range random
potential. It is shown that due to long time it takes for an electron to drift
along the perimeter of a large percolation cluster, phonons are able to
maintain quasi-equilibrium inside the cluster. The saddle points separating
such clusters may then be viewed as ballistic point contacts between electron
reservoirs with different electrochemical potentials. The prefactor is
universal and equal to 2$e^2/h$ at an integer filling factor $\nu$ and to
2$e^2/q^{2}h$ at $\nu=p/q$.

20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat