Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Shake-up Processes in Intersubband Magneto-photoabsorption of a
  Two-Dimensional Electron Gas   I theoretically study shake-up processes in photoabsorption of an interacting
low-density two-dimensional electron gas (2DEG) in magnetic fields. Such
processes, in which an incident photon creates an electron-hole pair and
simultaneously excites one electron to one of the higher Landau levels, were
observed experimentally [D.R. Yakovlev et al., Phys. Rev. Lett. 79, 3974
(1997)] and were called combined exciton-cyclotron resonance (ExCR). The
recently developed theory of ExCR [A.B. Dzyubenko, Phys. Rev. B 64, 241101
(2001)] allows for a consistent treatment of the Coulomb correlations,
establishes the exact ExCR selection rules, and predicts the high field
features of ExCR. In this work, I generalize the existing theory of high-field
ExCR in the 2DEG to the case when the hole is excited to higher hole Landau
levels.

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The categories of this paper are: dg-ga
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The categories of this paper are: ao-sci
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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: hep-lat
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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: supr-con
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The categories of this paper are: stat
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int