Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Susbtrate-Induced Stabilization and Reconstruction of Zigzag Edges in
  Graphene Nanoislands on Ni(111)   We combine experimental observations by scanning tunneling microscopy (STM)
and density functional theory (DFT) to reveal the most stable edge structures
of graphene on Ni(111) as well as the role of stacking-driven activation and
suppression of edge reconstruction. Depending on the position of the outermost
carbon atoms relative to hollow and on-top Ni sites, zigzag edges have very
different energies. Triangular graphene nanoislands are exclusively bound by
the more stable zigzag hollow edges. In hexagonal nanoislands, which are
constrained by geometry to alternate zigzag hollow and zigzag top edges along
their perimeter, only the hollow edge is stable whereas the top edges
spontaneously reconstruct into the (57) pentagon-heptagon structure.
Atomically-resolved STM images are consistent with either top-fcc or top-hcp
epitaxial stacking of graphene and Ni sites, with the former being favored by
DFT. Finally, we find that there is a one-to-one relationship between the edge
type, graphene stacking, and orientation of the graphene islands.

9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg