Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-flipping 13C spins in NV diamond: Hyperfine and Spatial
  Characteristics by DFT Simulation of the C510[NV]H252 Cluster   Single NV centers in diamond coupled by hyperfine interaction to neighboring
13C nuclear spins are now widely used in the emerging quantum technologies as
elements of quantum memory adjusted to NV center electron spin qubit. For
nuclear spins with low flip-flop rate, single shot readout was demonstrated
under ambient conditions. Here we report on the systematic search of such
stable NV-13C systems using density functional theory (DFT) to simulate
hyperfine and spatial characteristics of all possible NV-13C complexes in the
H-terminated cluster C510 [NV]-H252 hosting the NV center. Along with the
expected stable NV- axial 13C systems wherein the 13C nuclear spin is located
on the NV axis, we found for the first time new families of positions for the
13C nuclear spin exhibiting negligible hyperfine-induced flipping rates due to
near-symmetric local spin density distribution. Spatially, these positions are
located in the diamond bilayer passing through the vacancy of the NV center and
being perpendicular to the NV axis. Analysis of available publications showed
that, apparently, some of the predicted non-axial near-stable systems NV-13C
have already been observed experimentally. A special experiment done on one of
these systems confirmed the prediction made

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The categories of this paper are: chem-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: physics
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The categories of this paper are: eess
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg
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The categories of this paper are: bayes-an
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The categories of this paper are: econ
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The categories of this paper are: q-bio
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ph