Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enhancement of hole injection for nitride-based light-emitting devices   A novel device design is proposed for a strong enhancement of hole injection
current in nitride-based light-emitting heterostructures. Preliminary
calculations show orders of magnitude increase in injected hole current when
using the proposed superlattice hole injector device based on the real-space
transfer concept.

8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an