Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coulomb drag in monolayer and bilayer graphene   We theoretically calculate the interaction-induced frictional Coulomb drag
resistivity between two graphene monolayers as well as between two graphene
bilayers, which are spatially separated by a distance "$d$". We show that the
drag resistivity between graphene monolayers can be significantly affected by
the intralayer momentum-relaxation mechanism. For energy independent intralayer
scattering, the frictional drag induced by inter-layer electron-electron
interaction goes asymptotically as $\rho_D \sim T^2/n^4d^6$ and $\rho_D \sim
T^2/n^2d^2$ in the high-density ($k_F d \gg 1$) and low-density ($k_F d \ll 1$)
limits, respectively. When long-range charge impurity scattering dominates
within the layer, the monolayer drag resistivity behaves as $\rho_D \sim
T^2/n^3d^4$ and $T^2 \ln (\sqrt{n} d) /n$ for $k_F d \gg 1$ and $k_F d \ll 1$,
respectively. The density dependence of the bilayer drag is calculated to be
$\rho_D \propto T^2/n^{3}$ both in the large and small layer separation limit.
In the large layer separation limit, the bilayer drag has a strong $1/d^4$
dependence on layer separation, whereas this goes to a weak logarithmic
dependence in the strong inter-layer correlation limit of small layer
separation. In addition to obtaining the asymptotic analytical formula for
Coulomb drag in graphene, we provide numerical results for arbitrary values of
density and layer separation interpolating smoothly between our asymptotic
theoretical results.

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The categories of this paper are: adap-org
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The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
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The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
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The categories of this paper are: patt-sol
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The categories of this paper are: eess
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The categories of this paper are: chem-ph