Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multiple gaps in the tight-binding band of a pentagonal lattice   Multiple gaps in the tight-binding band of a pentagonal lattice are found.
Unlike the Cairo pentagonal lattice this lattice is made of irregular pentagons
with arms of different lengths. The tight-binding Hamiltonian is exactly solved
to obtain analytic expressions of dispersion relations and eigenvectors. Four
different band-gaps are identified along with two distinct indirect band-gaps
at the Harrison point. Multiple band-gaps in this model may give rise to exotic
electronic properties.

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The categories of this paper are: bayes-an
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The categories of this paper are: eess
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
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The categories of this paper are: econ
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The categories of this paper are: q-alg
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The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
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The categories of this paper are: q-bio
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The categories of this paper are: comp-gas
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The categories of this paper are: nlin
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The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg