Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Shot noise and conductivity at high bias in bilayer graphene: Signatures
  of electron-optical phonon coupling   We have studied electronic conductivity and shot noise of bilayer graphene
(BLG) sheets at high bias voltages and low bath temperature $T_0=4.2$ K. As a
function of bias, we find initially an increase of the differential
conductivity, which we attribute to self-heating. At higher bias, the
conductivity saturates and even decreases due to backscattering from optical
phonons. The electron-phonon interactions are also responsible for the decay of
the Fano factor at bias voltages $V>0.1$ V. The high bias electronic
temperature has been calculated from shot noise measurements, and it goes up to
$\sim1200$ K at $V=0.75$ V. Using the theoretical temperature dependence of BLG
conductivity, we extract an effective electron-optical phonon scattering time
$\tau_{e-op}$. In a 230 nm long BLG sample of mobility $\mu=3600$
cm$^2$V$^{-1}$s$^{-1}$, we find that $\tau_{e-op}$ decreases with increasing
voltage and is close to the charged impurity scattering time $\tau_{imp}=60$ fs
at $V=0.6$ V.

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The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
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The categories of this paper are: stat
3
The categories of this paper are: physics
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The categories of this paper are: q-fin
9
The categories of this paper are: nlin
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The categories of this paper are: math-ph
12
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: eess
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The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
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The categories of this paper are: comp-gas
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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-lat