Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Potential fluctuations in graphene due to correlated charged impurities
  in substrate   We evaluate the autocorrelation function of the electrostatic potential in
doped graphene due to nearby charged impurities. The screening of those
impurities is described by a combination of the polarization function for
graphene in random phase approximation with the electrostatic Green's function
of the surrounding dielectrics. Using the hard-disk model for a two-dimensional
distribution of impurities, we show that large correlation lengths between
impurities can give rise to anti-correlation in the electrostatic potential, in
agreement with recent experiments.

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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol