Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stability of germanene under tensile strain   The stability of germanene under biaxial tensile strain and the accompanying
modifications of the electronic properties are studied by density functional
theory. The phonon spectrum shows that up to $16\%$ strain the germanene
lattice is stable, where the Dirac cone shifts towards higher energy and
hole-doped Dirac states are achieved. The latter is due to weakening of the
Ge-Ge bonds and reduction of the s-p hybridization. Our calculated Gr\"uneisen
parameter shows a similar dependence on the strain as reported for silicene
(which is different from that of graphene).

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The categories of this paper are: econ
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
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The categories of this paper are: q-bio
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The categories of this paper are: ao-sci
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The categories of this paper are: nlin
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The categories of this paper are: adap-org
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The categories of this paper are: supr-con
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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
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The categories of this paper are: patt-sol
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The categories of this paper are: atom-ph
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The categories of this paper are: math