Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Monitoring the low doping regime in graphene using Raman 2D peak-splits:
  Comparison of gated Raman and transport measurements   Avoiding charge density fluctuations and impurities in graphene is vital for
high-quality graphene-based devices. Traditional characterization methods
require device fabrication and electrical transport measurements, which are
labor-intensive and time-consuming. Existing optical methods using Raman
spectroscopy only work for doping levels higher than ~10^12 cm^-2. Here, we
propose an optical method using Raman 2D peak-splitting (split between the
Raman 2D1 and 2D2 peaks at low doping levels). Electrostatically gated Raman
measurements combined with transport measurements were used to correlate the 2D
peak-split with the charge density on graphene with high precision (2x10^10
cm^-2 per 2D peak-split wavenumber). We found that the Raman 2D peak-split has
a strong correlation with the charge density at low doping levels, and that a
lower charge density results in a larger 2D peak-split. Our work provides a
simple and non-invasive optical method to quantify the doping level of graphene
from 10^10 cm^-2 to 10^12 cm^-2, two orders of magnitude higher precision than
previously reported optical methods. This method provides a platform for
estimating the doping level and quality of graphene before fabricating graphene
devices

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The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph