Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Resonant photon tunneling enhancement of the van der Waals friction   We study the van der Waals friction between two flat metal surfaces in
relative motion. For good conductors we find that normal relative motion gives
a much larger friction than for parallel relative motion. The friction may
increase by many order of magnitude when the surfaces are covered by
adsorbates, or can support low-frequency surface plasmons. In this case the
friction is determined by resonant photon tunneling between adsorbate
vibrational modes, or surface plasmon modes.

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The categories of this paper are: astro-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: hep-lat
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The categories of this paper are: adap-org
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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: alg-geom
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The categories of this paper are: ao-sci
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The categories of this paper are: dg-ga
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The categories of this paper are: eess