Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Single-Layer CrI3 Grown by Molecular Beam Epitaxy   Single- and few-layer chromium triiodide (CrI3), which has been intensively
investigated as a promising platform for two-dimensional magnetism, was usually
prepared by mechanical exfoliation. Here, we report on the growth of
single-layer CrI3 by molecular beam epitaxy under ultrahigh vacuum. The atomic
structures and local density of states have been revealed by scanning tunneling
microscopy (STM). Iodine trimers, each of which consists of three I atoms
surrounding a three-fold Cr honeycomb center, have been identified as the basic
units of the topmost I layer. Different superstructures of single-layer CrI3
with characteristic periodicity around 2-4 nm were obtained on Au(111), but
only pristine structure was observed on graphite. At elevated temperatures (423
K), CrI3 was partially decomposed, resulting in the formation of single-layer
chromium diiodide. Our bias-dependent STM images suggest that the unoccupied
and occupied states are distributed spatial-separately, which is consistent
with our density functional theory calculations. The effect of charge
distribution on the superexchange interaction in single-layer CrI3 was
discussed.

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The categories of this paper are: hep-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: econ
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The categories of this paper are: astro-ph
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The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-th
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The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: nucl-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: math