Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effects of Antimony Deposition on Field-Emission Current Density of
  Ge/Si   To estimate the field-emission current density of a germanium/silicon
heterosystem, 20-nm Ge/Si(100) were grown by molecular beam epitaxy. The
surface of one sample was covered with a layer of antimony, which was removed
in vacuum prior to the samples being measured. A second sample of Ge/Si was
exposed to room air in the absence of antimony. The current-voltage
characteristics of both samples obtained by scanning tunneling microscopy were
discovered to be in agreement with classical Fowler-Nordheim theory. The
density of emission current from Ge nanocrystal exceeds the density of emission
current from the wetting layer of Ge/Si. The density of emission current of
pure Ge nanocrystal is less than the density of emission current of Ge
nanocrystal with adsorption layers.

28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys