Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Homogeneous Large-area Quasi-freestanding Monolayer and Bilayer Graphene
  on SiC   In this study, we first show that the argon flow during epitaxial graphene
growth is an important parameter to control the quality of the buffer and the
graphene layer. Atomic force microscopy (AFM) and low-energy electron
diffraction (LEED) measurements reveal that the decomposition of the SiC
substrate strongly depends on the Ar mass flow rate while pressure and
temperature are kept constant. Our data are interpreted by a model based on the
competition of the SiC decomposition rate, controlled by the Ar flow, with a
uniform graphene buffer layer formation under the equilibrium process at the
SiC surface. The proper choice of a set of growth parameters allows the growth
of defect-free, ultra-smooth and coherent graphene-free buffer layer and
bilayer-free monolayer graphene sheets which can be transformed into large-area
high-quality quasi-freestanding monolayer and bilayer graphene (QFMLG and
QFBLG) by hydrogen intercalation. AFM, scanning tunneling microscopy (STM),
Raman spectroscopy and electronic transport measurements underline the
excellent homogeneity of the resulting quasi-freestanding layers. Electronic
transport measurements in four-point probe configuration reveal a homogeneous
low resistance anisotropy on both {\mu}m- and mm scales.

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The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph