Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A New Type of Electron Nuclear-Spin Interaction from Resistively
  Detected NMR in the Fractional Quantum Hall Effect Regime   Two dimensional electron gases in narrow GaAs quantum wells show huge
longitudinal resistance (HLR) values at certain fractional filling factors.
Applying an RF field with frequencies corresponding to the nuclear spin
splittings of {69}Ga, {71}Ga and {75}As leads to a substantial decreases of the
HLR establishing a novel type of resistively detected NMR. These resonances are
split into four sub lines each. Neither the number of sub lines nor the size of
the splitting can be explained by established interaction mechanisms.

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The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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The categories of this paper are: nlin
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The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-ph
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The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: hep-th
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The categories of this paper are: acc-phys
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The categories of this paper are: atom-ph