Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relativistic Double Barrier Problem with Three Sub-Barrier Transmission
  Resonance Regions   We obtain exact scattering solutions of the Dirac equation in 1+1 dimensions
for a double square barrier vector potential. The potential floor between the
two barriers is higher than 2mc^2 whereas the top of the barriers is at least
2mc^2 above the floor. The relativistic version of the conventional double
barrier transmission resonance is obtained for energies within + or - mc^2 from
the height of the barriers. However, we also find two more (sub-barrier)
transmission resonance regions below the conventional one. Both are located
within the two Klein energy zones and characterized by resonances that are
broader than the conventional ones.

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The categories of this paper are: atom-ph
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The categories of this paper are: hep-th
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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: cond-mat
0
The categories of this paper are: hep-ph
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The categories of this paper are: cs
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The categories of this paper are: adap-org
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
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The categories of this paper are: eess
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The categories of this paper are: gr-qc
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The categories of this paper are: ao-sci
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The categories of this paper are: nlin