Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Snake states and Klein tunneling in a graphene Hall bar with a
  pn-junction   The Hall (RH) and bend (RB) resistance of a graphene Hall bar structure
containing a pn-junction are calculated when in the ballistic regime. The
simulations are done using the billiard model. Introducing a
pn-junction--dividing the Hall bar geometry in two regions--leads to two
distinct regimes exhibiting very different physics: 1) both regions are of
n-type and 2) one region is n-type and the other p-type. In regime (1) a 'Hall
plateau'--an enhancement of the resistance--appears for RH. On the other hand,
in regime (2), we found a negative RH, which approaches zero for large B. The
bend resistance is highly asymmetric in regime (2) and the resistance increases
with increasing magnetic field B in one direction while it reduces to zero in
the other direction.

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The categories of this paper are: hep-th
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The categories of this paper are: q-bio
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The categories of this paper are: physics
1
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: math-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an
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The categories of this paper are: eess
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The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: math
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The categories of this paper are: hep-lat