Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Research progress of electronic properties of self-assembled
  semiconductor quantum dots   Self-assembled semiconductor quantum dot is a new type of artificially
designed and grown function material which exhibits quantum size effect,
quantum interference effect, surface effect, quantum tunneling-Coulumb-blockade
effect and nonlinear optical effect. Due to advantages like less crystal
defects and relatively simpler fabrication technology, that material may be of
important value in future nanoelectronic device researches. In the order of
vertical transport, lateral transport and charge storage, this paper gives a
brief introduction of recent advances in the electronic properties of that
material and an analysis of problems and perspectives.

30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio