Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Epitaxial growth and characterization of high quality Bi2O2Se thin films
  on SrTiO3 substrates by pulsed laser deposition   Recently, Bi2O2Se is discovered as a promising two-dimensional (2D)
semiconductor for next generation electronics, due to its moderate bandgap
size, high electron mobility and pronounced ambient stability. Meanwhile, it
has been predicted that high quality Bi2O2Se-related heterostructures may
possess exotic physical phenomena, such as piezoelectricity and topological
superconductivity. Herein, we report the first successful heteroepitaxial
growth of Bi2O2Se films on SrTiO3 substrates via pulsed laser deposition (PLD)
method. Films obtained under optimal conditions show an epitaxial growth with
the c axis perpendicular to the film surface and the a and b axes parallel to
the substrate. The growth mode transition to three dimensional (3D) island from
quasi-2D layer of the heteroepitaxial Bi2O2Se films on SrTiO3 (001) substrates
is observed as prolonging deposition time of films. The maximum value of
electron mobility reaches 160 cm2/V-1s-1 at room temperature in a 70nm-thick
film. The thickness dependent mobility provides evidence that
interface-scattering is likely to be the limiting factor for the relatively low
electron mobility at low temperature, implying that the interface engineering
as an effective method to tune the low temperature electron mobility. Our work
suggests the epitaxial Bi2O2Se films grown by PLD are promising for both
fundamental study and practical applications.

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The categories of this paper are: hep-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
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The categories of this paper are: supr-con
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The categories of this paper are: ao-sci
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The categories of this paper are: econ
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The categories of this paper are: quant-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: comp-gas
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin
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The categories of this paper are: acc-phys