Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electron spin resonance in S=1/2 antiferromagnets at high temperature   We study the electron spin resonance (ESR) of low-dimensional spin systems at
high temperature, and test the Kubo-Tomita theory of exchange narrowing. In
finite-size systems (molecular magnets), we found a double-peak resonance which
strongly differs from the usual Lorentzian. For infinite systems, we have
predictions for the linewidth and lineshape as a function of the anisotropy
strength. For this, we have used an interpolation between a non-perturbative
calculation of the memory function at short times (exact diagonalization) and
the hydrodynamic spin-diffusion at long times. We show that the
Dzyaloshinskii-Moriya anisotropies generally induce a much larger linewidth
than the exchange anisotropies in two dimensions, contrary to the
one-dimensional case.

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The categories of this paper are: quant-ph
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The categories of this paper are: physics
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The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
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The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: acc-phys
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The categories of this paper are: atom-ph
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The categories of this paper are: stat
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The categories of this paper are: math-ph
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The categories of this paper are: cs
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The categories of this paper are: eess
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The categories of this paper are: econ
23
The categories of this paper are: solv-int