Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Time-Resolved Spectroscopy of Single Excitons Bound to Pairs of Te
  Isoelectronic Impurity Centers in ZnSe   Tellurium impurity centers in ZnSe were individually probed with
time-resolved photoluminescence (PL) spectroscopy. Resolution-limited peaks
with an ultra-low spatial density originate in the recombination of excitons
deeply bound to isolated nearest-neighbor isoelectronic Te pairs (Te2). This
interpretation is confirmed by ab-initio calculations. The peaks reveal
anti-bunched photon emission and a doublet structure polarized along [110] and
[-110]. We analyze the time-resolved PL decay to clarify the role of the dark
states in the spin relaxation and radiative recombination of single
fine-structure split excitons.

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The categories of this paper are: atom-ph
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The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
16
The categories of this paper are: stat
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
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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