Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ag induced zero- and one-dimensional nanostructures on vicinal Si(111)   The formation of a Ag stabilized regular step lattice on vicinal Si(111)
miscut towards [11-2] is reported. The step bunching characteristic of the
clean surface is prevented by a single-domain Si(111)-(3x1)-Ag reconstruction.
The nanostructured surface is used as a template for growing one-dimensional
arrays of 1 nm sized Ag quantum dots with a preferential spacing of 1.5 nm
along the rows.

12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org