Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Length and temperature dependent crossover of charge transport across
  molecular junctions   We study the electronic transport in a molecular junction in which each site
is coupled to a local phonon bath using the non-equilibrium Green's function
method. We observe the length period of the oscillatory conductance in
odd-numbered chains depends strongly on the applied bias, and the oscillatory
behavior is smeared out for the bias voltage near the phonon energy. In
addition, a crossover from tunneling to thermally activated hopping transport
as the length of the molecule increases is found for the phonon-free case. In
the presence of electron-phonon interaction, hopping transport is dominant and
a transition from the thermally suppressed to assisted conduction is observed.

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The categories of this paper are: comp-gas
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The categories of this paper are: supr-con
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: atom-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ex
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The categories of this paper are: q-fin
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The categories of this paper are: cmp-lg
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The categories of this paper are: astro-ph
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The categories of this paper are: q-bio
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol
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The categories of this paper are: plasm-ph