Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Perfect transmission at oblique incidence by trigonal warping in
  graphene P-N junctions   We develop an analytical mode-matching technique for the tight-binding model
to describe electron transport across graphene P-N junctions. This method
shares the simplicity of the conventional mode-matching technique for the
low-energy continuum model and the accuracy of the tight-binding model over a
wide range of energies. It further reveals an interesting phenomenon on a sharp
P-N junction: the disappearance of the well-known Klein tunneling (i.e.,
perfect transmission) at normal incidence and the appearance of perfect
transmission at oblique incidence due to trigonal warping at energies beyond
the linear Dirac regime. We show that this phenomenon arises from the
conservation of a generalized pseudospin in the tight-binding model. We expect
this effect to be experimentally observable in graphene and other Dirac
fermions systems, such as the surface of three-dimensional topological
insulators.

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The categories of this paper are: hep-th
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The categories of this paper are: hep-lat
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The categories of this paper are: q-fin
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
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The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs