Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low temperature enhancement of ferromagnetic Kitaev correlations in
  {\alpha}-RuCl3   Kitaev-type interactions between neighbouring magnetic moments emerge in the
honeycomb material ${\alpha}$-RuCl3. It is debated however whether these Kitaev
interactions are ferromagnetic or antiferromagnetic. With electron energy loss
spectroscopy (EELS) we study the lowest excitation across the Mott-Hubbard gap,
which involves a d4 triplet in the final state and therefore is sensitive to
nearest-neighbor spin-spin correlations. At low temperature the spectral weight
of these triplets is strongly enhanced, in accordance with optical data. We
show that the magnetic correlation function that determines this EELS spectral
weight is directly related to a Kitaev-type spin-spin correlator and that the
temperature dependence agrees very well with the results of a microscopic
magnetic Hamiltonian for ${\alpha}$-RuCl3 with ferromagnetic Kitaev coupling.

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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: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: q-alg
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The categories of this paper are: hep-th
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The categories of this paper are: dg-ga
3
The categories of this paper are: physics
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The categories of this paper are: nucl-ex
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
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The categories of this paper are: ao-sci