Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-color surface lattice solitons   We study the properties of surface solitons generated at the edge of a
semi-infinite photonic lattice in nonlinear quadratic media, namely two-color
surface lattice solitons. We analyze the impact of phase mismatch on existence
and stability of surface modes, and find novel classes of two-color twisted
surface solitons which are stable in a large domain of their existence.

15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat