Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photo-thermal transitions of magneto-excitons in quantum wells   By monitoring changes in excitonic photoluminescence (PL) that are induced by
terahertz (THz) radiation, we observe resonant THz absorption by
magnetoexcitons in GaAs/AlGaAs quantum wells. Changes in the PL spectrum are
explored as a function of temperature and magnetic field, providing insight
into the mechanisms which allow THz absorption to modulate PL. The strongest
PL-quenching occurs at the heavy hole $1s\to 2p^+$ resonance where heavy hole
excitons are photo-thermally converted into light hole excitons.

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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin
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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org
2
The categories of this paper are: math
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The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: eess
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The categories of this paper are: funct-an
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The categories of this paper are: math-ph
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The categories of this paper are: hep-th
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The categories of this paper are: gr-qc