Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-universal Transverse Electron Mean Free Path through Few-layer
  Graphene   In contrast to the in-plane transport electron mean-free path in graphene,
the transverse mean-free path has received little attention and is often
assumed to follow the 'universal' mean-free path (MFP) curve broadly adopted in
surface and interface science. Here we directly measure transverse electron
scattering through graphene from 0 to 25 eV above the vacuum level both in
reflection using Low Energy Electron Microscopy and in transmission using
electron-Volt Transmission Electron Microscopy. From this data, we obtain
quantitative MFPs for both elastic and inelastic scattering. Even at the lowest
energies, the total MFP is just a few graphene layers and the elastic MFP
oscillates with graphene layer number, both refuting the 'universal' curve. A
full theoretical calculation taking the graphene band structure into
consideration agrees well with experiment, while the key experimental results
are reproduced even by a simple optical toy model.

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The categories of this paper are: cmp-lg
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The categories of this paper are: mtrl-th
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The categories of this paper are: adap-org
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The categories of this paper are: chao-dyn
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The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
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The categories of this paper are: supr-con
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The categories of this paper are: chem-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: plasm-ph
2
The categories of this paper are: math
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ex
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The categories of this paper are: stat
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The categories of this paper are: q-alg