Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Wiedemann-Franz Relation and Thermal-transistor Effect in Suspended
  Graphene   We extract experimentally the electronic thermal conductivity, $K_{e}$, in
suspended graphene which we dope using a back-gate electrode. We make use of
two-point dc electron transport at low bias voltages and intermediate
temperatures (50 - 160 K), where the electron and lattice temperatures are
decoupled. The thermal conductivity is proportional to the charge conductivity
times the temperature, confirming that the Wiedemann-Franz relation is obeyed
in suspended graphene. We extract an estimate of the Lorenz coefficient as 1.1
to 1.7 $\times 10^{-8}$ W $\Omega$K$^{-2}$. $K_e$ shows a transistor effect and
can be tuned with the back-gate by more than a factor of 2 as the charge
carrier density ranges from $\approx$ 0.5 to 1.8 $\times 10^{11}$cm$^{-2}$.

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The categories of this paper are: quant-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
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The categories of this paper are: nlin
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The categories of this paper are: econ
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol
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The categories of this paper are: mtrl-th
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The categories of this paper are: math-ph
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The categories of this paper are: hep-th
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The categories of this paper are: alg-geom