Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Indirect Exchange Interaction in Fully Metal-Semiconductor Separated
  SWCNTs Revealed by ESR   The ESR response from highly metal-semiconductor(M-SC) separated SWCNTs for
temperatures T between 0.39 and 200 K is characteristically different for the
two systems. The signal originates from defect spins but interaction with free
electrons leads to a larger line width for M tubes. The latter decreases with
increasing T whereas it increases with T for SC tubes. The spins undergo a
ferromagnetic phase transition below around 10 K. Indirect exchange is
suggested to be responsible for the spin-spin interaction, supported by RKKY
interaction in the case of M tubes. For SC tubes spin-lattice relaxation via an
Orbach process is suggested to determine the line width.

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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: q-bio
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-ex
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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: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: physics
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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: q-fin