Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Graphene terahertz modulators by ionic liquid gating   Graphene based THz modulators are promising due to the conical band structure
and high carrier mobility of graphene. Here, we tune the Fermi level of
graphene via electrical gating with the help of ionic liquid to control the THz
transmittance. It is found that, in the THz range, both the absorbance and
reflectance of the device increase proportionately to the available density of
states due to intraband transitions. Compact, stable, and repeatable THz
transmittance modulation up to 93% (or 99%) for a single (or stacked) device
has been demonstrated in a broad frequency range from 0.1 to 2.5 THz, with an
applied voltage of only 3 V at room temperature.

8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci