Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interband Light Absorption at a Rough Interface   Light absorption at the boundary of indirect-band-gap and direct-forbidden
gap semiconductors is analyzed. It is found that the possibility of the
electron momentum nonconservation at the interface leads to essential
enhancement of absorption in porous and microcrystalline semiconductors. The
effect is more pronounced at a rough boundary due to enlargement of the share
of the interface atoms.

8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio