Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Room-temperature Single Photon Emitters in Cubic Boron Nitride
  Nanocrystals   Color centers in wide bandgap semiconductors are attracting broad attention
as platforms for quantum technologies relying on room-temperature single-photon
emission (SPE), and for nanoscale metrology applications building on the
centers' response to electric and magnetic fields. Here, we demonstrate
room-temperature SPE from defects in cubic boron nitride (cBN) nanocrystals,
which we unambiguously assign to the cubic phase using spectrally resolved
Raman imaging. These isolated spots show photoluminescence (PL) spectra with
zero-phonon lines (ZPLs) within the visible region (496-700 nm) when subject to
sub-bandgap laser excitation. Second-order autocorrelation of the emitted
photons reveals antibunching with $g^{2}$ ~ 0.2 and a decay constant of 2.75 ns
that is further confirmed through fluorescence lifetime measurements. The
results presented herein prove the existence of optically addressable isolated
quantum emitters originating from defects in cBN, making this material an
interesting platform for opto-electronic devices and quantum applications.

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The categories of this paper are: adap-org
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The categories of this paper are: supr-con
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The categories of this paper are: cs
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The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph
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The categories of this paper are: nlin
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The categories of this paper are: math-ph
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The categories of this paper are: q-alg
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The categories of this paper are: funct-an
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The categories of this paper are: astro-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: math
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The categories of this paper are: quant-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio