Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Hall effect at cleaved InSb surfaces and low-temperature
  annealing effect   We have performed low-temperature in-plane magnetotransport measurements on
two-dimensional electron systems induced by deposition of Ag at {\it in situ}
cleaved surfaces of {\it p}-type InSb. The quantum Hall effect was observed
even at low magnetic fields around 2 T. The surface electron density and the
electron mobility exhibit strong dependence on the Ag-coverage and the
annealing temperature in the range of 15-40 K. The annealing effect suggests
that the surface morphology strongly affects the properties of the
two-dimensional electron systems.

20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph