Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Graphene on Gallium Arsenide: Engineering the visibility   Graphene consists of single or few layers of crystalline ordered carbon
atoms. Its visibility on oxidized silicon (Si/SiO\_2) enabled its discovery and
spawned numerous studies of its unique electronic properties. The combination
of graphene with the equally unique electronic material gallium arsenide (GaAs)
has up to now lacked such easy visibility. Here we demonstrate that a
deliberately tailored GaAs/AlAs (aluminum arsenide) multi-layer structure makes
graphene just as visible on GaAs as on Si/SiO\_2. We show that standard
microscope images of exfoliated graphite on GaAs/AlAs suffice to identify
mono-, bi-, and multi-layers of graphene. Raman data confirm our results.

14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex