Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Size Quantization in Planar Graphene-Based Heterostructures: Pseudospin
  Splitting, Interface States, and Excitons   A planar quantum-well device made of a gapless graphene nanoribbon with edges
in contact with gapped graphene sheets is examined. The size-quantization
spectrum of charge carriers in an asymmetric quantum well is shown to exhibit a
pseudospin splitting. Interface states of a new type arise from the crossing of
dispersion curves of gapless and gapped graphene materials. The exciton
spectrum is calculated for a planar graphene quantum well. The effect of an
external electric field on the exciton spectrum is analyzed.

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The categories of this paper are: dg-ga
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
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The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
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The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph