Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Graphene infrared light emitting diode (GILED)   The present Letter proposes a device based on graphene for infrared light
emission. It is based on a n- and p-doped monolayer graphene (MGs), with Fermi
energies $E_F$ and -$E_F$, respectively, sandwiching a bilayer graphene (BG)
with bandgap $\Lambda=2|eV_g-\Delta|\geq 2E_F$, where $V_g$ is the gate voltage
across the BG and $\Delta$ the sub-lattice energy difference into each layer of
the BG. This device works as simple as tuning the gate voltage to decrease the
BG bandgap down to $2E_F$; and, once this condition is fulfilled, a current
flows from the n-doped MG to the p-doped MG. However, when electrons achieve
the other side of the device, i.e., into the p-doped MG, their energies ($E_F$)
are much bigger than the holes energies ($-E_F$), and thus these electrons
decay emitting infrared photons.

33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int