Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Epitaxial Growth of VO$_{2}$ by Periodic Annealing   We report the growth of ultrathin VO$_{2}$ films on rutile TiO$_{2}$ (001)
substrates via reactive molecular-beam epitaxy. The films were formed by the
cyclical deposition of amorphous vanadium and its subsequent oxidation and
transformation to VO$_{2}$ via solid-phase epitaxy. Significant metal-insulator
transitions were observed in films as thin as 2.3 nm, where a resistance change
{\Delta}R/R of 25 was measured. Low angle annular dark field scanning
transmission electron microscopy was used in conjunction with electron energy
loss spectroscopy to study the film/substrate interface and revealed the
vanadium to be tetravalent and the titanium interdiffusion to be limited to 1.6
nm.

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The categories of this paper are: hep-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: stat
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
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The categories of this paper are: q-fin
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an