Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Structural phase transition and bandgap control through mechanical
  deformation in layered semiconductors 1T-ZrX2 (X = S, Se)   Applying elastic deformation can tune a material physical properties locally
and reversibly. Spatially modulated lattice deformation can create a bandgap
gradient, favouring photo-generated charge separation and collection in
optoelectronic devices. These advantages are hindered by the maximum elastic
strain that a material can withstand before breaking. Nanomaterials derived by
exfoliating transition metal dichalcogenides TMDs are an ideal playground for
elastic deformation, as they can sustain large elastic strains, up to a few
percent. However, exfoliable TMDs with highly strain-tunable properties have
proven challenging for researchers to identify. We investigated 1T-ZrS2 and
1T-ZrSe2, exfoliable semiconductors with large bandgaps. Under compressive
deformation, both TMDs dramatically change their physical properties. 1T-ZrSe2
undergoes a reversible transformation into an exotic three-dimensional lattice,
with a semiconductor-to-metal transition. In ZrS2, the irreversible
transformation between two different layered structures is accompanied by a
sudden 14 % bandgap reduction. These results establish that Zr-based TMDs are
an optimal strain-tunable platform for spatially textured bandgaps, with a
strong potential for novel optoelectronic devices and light harvesting.

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The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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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: patt-sol
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The categories of this paper are: cs
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: q-bio
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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys