Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Consideration of the Intricacies Inherent in Molecular Beam Epitaxy of
  the NaCl/GaAs System   The high cost of substrates for III-V growth can be cost limiting for
technologies that require large semiconductor areas. Thus, being able to
separate device layers and reuse the original substrate is highly desirable,
but existing techniques to lift off a film from a substrate have substantial
drawbacks. This work discusses some of the complexities with the growth of a
water-soluble, alkali-halide salt thin film between a III-V substrate and
overlayer. Much of the difficulty stems from the growth of GaAs on an actively
decomposing NaCl surface at elevated temperatures. Interestingly, the presence
of an in-situ electron beam incident on the NaCl surface, prior to and during
GaAs deposition, affects the crystallinity and morphology of the III-V
overlayer. Here we investigate a wide range of growth temperatures and the
timing of the impinging flux of both elemental sources and high energy
electrons at different points during the growth. We show that an assortment of
morphologies (discrete islands, porous material, and fully dense layers with
sharp interfaces) and crystallinity (amorphous, crystalline, and highly
textured) occur depending on the specific growth conditions, driven largely by
changes in GaAs nucleation which is greatly affected by the presence of the
reflection high energy electron diffraction beam.

16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ