Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Anomalously Strong Nonlinearity of Unswept Quartz Acoustic Cavities at
  Liquid Helium Temperatures   We demonstrate a variety of nonlinear phenomena at extremely low powers in
cryogenic acoustic cavities fabricated from quartz material, which have not
undergone any electrodiffusion processes. Nonlinear phenomena observed include
lineshape discontinuities, power response discontinuities, quadrature
oscillations and self-induced transparency. These phenomena are attributed to
nonlinear dissipation through a large number of randomly distributed heavy
trapped ions, which would normally be removed by electrodiffusion. A simple
mean-field model predicts most of the observed phenomena. In contrast to
Duffing-like systems, this system shows an unusual mechanism of nonlinearity,
which is not related to crystal anharmonisity.

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The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
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The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
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The categories of this paper are: bayes-an
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-th
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The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
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The categories of this paper are: eess
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc