Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electronic and magnetic properties of the RuX$_3$ (X=Cl, Br, I) family:
  Two siblings -- and a cousin?   Motivated by recent reports of metallic behavior in the newly synthesized
RuI$_3$, in contrast to the Mott-insulating nature of the actively discussed
$\alpha$-RuCl$_3$, as well as RuBr$_3$, we present a detailed comparative
analysis of the electronic and magnetic properties of this family of
trihalides. Using a combination of first-principles calculations and
effective-model considerations, we conclude that RuI$_3$, similarly to the
other two members, is most probably on the verge of a Mott insulator, but with
much smaller magnetic moments and a strong magnetic frustration. We predict the
ideal pristine crystal of RuI$_3$ to have a nearly vanishing conventional
nearest-neighbor Heisenberg interaction and to be a quantum spin liquid
candidate of possibly different kind than the Kitaev spin liquid. In order to
understand the apparent contradiction to the reported resistivity $\rho$, we
analyze the experimental evidence for all three compounds and propose a
scenario for the observed metallicity in existing samples of RuI$_3$.
Furthermore, for the Mott insulator RuBr$_3$ we obtain a magnetic Hamiltonian
of a similar form to that in the much discussed $\alpha$-RuCl$_3$ and show that
this Hamiltonian is in agreement with experimental evidence in RuBr$_3$.

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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: ao-sci
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: supr-con
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The categories of this paper are: math-ph
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: q-alg
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The categories of this paper are: adap-org
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The categories of this paper are: atom-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys