Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Millimeter-Scale, Highly Ordered Single Crystalline Graphene Grown on Ru
  (0001) Surface   We demonstrate a method for synthesizing large scale single layer graphene by
thermal annealing of ruthenium single crystal containing carbon. Low energy
electron diffraction indicates the graphene grows to as large as millimeter
dimensions with good long-range order, and scanning tunneling microscope shows
perfect crystallinity. Analysis of Moire pattern augmented with
first-principles calculations shows the graphene layer is incommensurate with
the underlying Ru(0001) surface forming a N by N superlattice with an average
lattice strain of ~ +0.81%. Our findings offer an effective method for
producing high quality single crystalline graphene for fundamental research and
large-scale graphene wafer for device fabrication and integration.

19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin