Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two Types of Microwave-Induced Magnetoresistance Oscillations in a 2D
  Electron Gas at Large Filling Factors   The influence of microwave radiation (1.2-140 GHz) on resistance of
high-mobility two-dimensional electron gas in GaAs quantum wells is studied.
Two series of microwave-induced magnetoresistance oscillations periodic in 1/B
were observed under microwave radiation. The periods of oscillations are
determined by the microwave frequency and power, correspondingly. The
experimental data is qualitatively explained by photon-assisted transport and
Zener tunneling between Landau orbits.

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The categories of this paper are: astro-ph
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The categories of this paper are: stat
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The categories of this paper are: atom-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: supr-con
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The categories of this paper are: math
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-th
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The categories of this paper are: adap-org
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The categories of this paper are: hep-th
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-lat
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The categories of this paper are: comp-gas
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The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph