Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Anomalous circular polarization of magneto-photoluminescence from
  individual CdSe nanocrystals   We study the low-temperature magneto-photoluminescence (PL) from individual
CdSe nanocrystals. Nanocrystals having a small "bright" exciton fine structure
splitting ($<$0.5 meV) exhibit a conventional left- and right-circularly
polarized Zeeman PL doublet in applied magnetic fields. In contrast,
nanocrystals with large fine structure splitting ($>$1 meV) show an anomalous
magneto-PL polarization, wherein the lower-energy peak becomes circularly
polarized with increasing field, while the higher-energy peak remains linearly
polarized. This unusual behavior arises from strong mixing between the
absorbing and emitting bright exciton levels due to strong anisotropic exchange
interactions.

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The categories of this paper are: mtrl-th
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The categories of this paper are: cs
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The categories of this paper are: stat
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The categories of this paper are: hep-ex
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The categories of this paper are: q-fin
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The categories of this paper are: bayes-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-th
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
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The categories of this paper are: adap-org