Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Physical Origin of Nonlinear transport in organic semiconductor at high
  carrier densities   The charge transport in some organic semiconductors demonstrates nonlinear
properties and further universal power-law scaling with both bias and
temperature. The physical origin of this behavior is investigated here using
variable range hopping theory. The results shows, this universal power-law
scaling can be well explained by variable range hopping theory . Relation to
the recent experimental data is also discussed.

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The categories of this paper are: q-bio
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The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
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The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
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The categories of this paper are: bayes-an
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The categories of this paper are: gr-qc
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph