Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonlinear optical properties in a nanoring: Quantum size and
  Aharonov-Bohm effect   We have performed calculations of nonlinear optical absorption and nonlinear
optical rectification of an exciton in a nanoring in the presence of the
magnetic flux. Our results show that one can control properties of nonlinear
optical absorption and nonlinear optical rectification of a nanoring by tuning
outer and inner radius. In addition, we also find that nonlinear optical
properties of a nanoring can be modulated by the magnetic flux through
nanoring.

36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys