Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-Dimensional Optical Spectroscopy of Excitons in Semiconductor
  Quantum Wells: Liouville-space pathway analysis   We demonstrate how dynamic correlations of heavy-hole and light-hole excitons
in semiconductor quantum wells may be investigated by two dimensional
correlation spectroscopy (2DCS). The coherent response to three femtosecond
optical pulses is predicted to yield cross (off-diagonal) peaks that contain
direct signatures of many-body two-exciton correlations. Signals generated at
various phase-matching directions are compared.

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The categories of this paper are: q-bio
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The categories of this paper are: cs
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The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas