Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Band Alignment of 2D Semiconductors for Designing Heterostructures with
  Momentum Space Matching   We present a comprehensive study of the band alignments of two-dimensional
(2D) semiconducting materials and highlight the possibilities of forming
momentum-matched type I, II and III heterojunctions; an enticing possibility
being atomic heterostructures where the constituent monolayers have band edges
at the zone center. Our study, which includes the Group IV and III-V compound
monolayer materials, Group V elemental monolayer materials, transition metal
dichalcogenides (TMD) and transition metal trichalcogenides (TMT) reveals that
almost half of these materials have conduction and/or valence band edges
residing at the zone center. Using first-principles density functional
calculations, we present the type of the heterojunction for 903 different
possible combination of these 2D materials which establishes a periodic table
of heterojunctions.

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The categories of this paper are: chem-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ph
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The categories of this paper are: q-alg
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The categories of this paper are: hep-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: econ
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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: supr-con
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The categories of this paper are: hep-th
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The categories of this paper are: adap-org
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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: alg-geom