Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum chaos in Feshbach resonances of the ErYb system   We investigate ultracold magnetic-field-assisted collisions in the so far
unexplored ErYb system. The nonsphericity of the Er atom leads to weakly
anisotropic interactions that provide the mechanism for Feshbach resonances to
emerge. The resonances are moderately sparsely distributed with a density of
$0.1\,{\rm G}^{-1}-0.3\,{\rm G}^{-1}$ and exhibit chaotic statistics
characterized by a Brody parameter $\eta \approx 0.5-0.7$. The chaotic
behaviour of Feshbach resonances is accompanied by strong mixing of magnetic
and rotational quantum numbers in near-threshold bound states. We predict the
existence of broad resonances at fields $<300\,{\rm G}$ that may be useful for
the precise control of scattering properties and magnetoassociation of ErYb
molecules. The high number of bosonic Er-Yb isotopic combinations gives many
opportunities for mass scaling of interactions. Uniquely, two isotopic
combinations have nearly identical reduced masses (differing by less than
$10^{-5}$ relative) that we expect to have strikingly similar Feshbach
resonance spectra, which would make it possible to experimentally measure their
sensitivity to hypothetical variations of proton-to-electron mass ratio.

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The categories of this paper are: math
27
The categories of this paper are: comp-gas
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The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
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The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
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The categories of this paper are: q-fin
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The categories of this paper are: cs
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ph
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The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci