Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct Observation of Born-Oppenheimer Approximation Breakdown in Carbon
  Nanotubes   Raman spectra and electrical conductance of individual, pristine, suspended,
metallic single-walled carbon nanotubes are measured under applied gate
potentials. The G- band is observed to downshift with small applied gate
voltages, with the minima occurring at EF = +/- 1/2 Ephonon, contrary to
adiabatic predictions. A subsequent upshift in the Raman frequency at higher
gate voltages results in a 'W'-shaped Raman shift profile that agrees well with
a non-adiabatic phonon renormalization model. This behavior constitutes the
first experimental confirmation of the theoretically predicted breakdown of the
Born-Oppenheimer approximation in individual single walled carbon nanotubes.

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The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
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The categories of this paper are: comp-gas
3
The categories of this paper are: physics
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The categories of this paper are: eess
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The categories of this paper are: ao-sci
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The categories of this paper are: math
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The categories of this paper are: econ
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The categories of this paper are: patt-sol
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The categories of this paper are: quant-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: funct-an