Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Stability, Energetics, and Magnetic States of Cobalt Adatoms on
  Graphene   We investigate the stability and electronic properties of single Co atoms on
graphene with near-exact many-body calculations. A frozen-orbital embedding
scheme was combined with auxiliary-field quantum Monte Carlo to increase the
reach in system sizes. Several energy minima are found as a function of the
distance $h$ between Co and graphene. Energetics only permit the Co atom to
occupy the top site at $h = 2.2$ \AA\ in a high-spin $3d^{8}4s^{1}$ state, and
the van der Waals region at $h = 3.3$ \AA\ in a high-spin $3d^{7}4s^{2}$ state.
The findings provide an explanation for recent experimental results with Co on
free-standing graphene.

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The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: q-bio
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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The categories of this paper are: nlin
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The categories of this paper are: cs
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ph
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The categories of this paper are: q-fin
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The categories of this paper are: math
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
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The categories of this paper are: stat
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The categories of this paper are: hep-th
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The categories of this paper are: solv-int