Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Excitonic absorption in gate controlled graphene quantum dots   We present a theory of excitonic processes in gate controlled graphene
quantum dots. The dependence of the energy gap on shape, size and edge for
graphene quantum dots with up to a million atoms is predicted. Using a
combination of tight-binding, Hartree-Fock and configuration interaction
methods, we show that triangular graphene quantum dots with zigzag edges
exhibit optical transitions simultaneously in the THz, visible and UV spectral
ranges, determined by strong electron-electron and excitonic interactions. The
relationship between optical properties and finite magnetic moment and charge
density controlled by an external gate is predicted.

37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
30
The categories of this paper are: q-alg