Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Helicoid-arc van Hove singularities in topological chiral crystals   Van Hove singularity are electronic instabilities that lead to many
fascinating interactions, such as superconductivity and charge-density waves.
And despite much interest, the nexus of emergent correlation effects from van
Hove singularities and topological states of matter remains little explored in
experiments. By utilizing synchrotron-based angle-resolved photoemission
spectroscopy and Density Functional Theory, here we provide the first discovery
of the helicoid quantum nature of topological Fermi arcs inducing van Hove
singularities. In particular, in topological chiral conductors RhSi and CoSi we
directly observed multiple types of inter- and intra-helicoid-arc mediated
singularities, which includes the type-I and type-II van Hove singularity. We
further demonstrate that the energy of the helicoid-arc singularities are
easily tuned by chemical engineering. Taken together, our work provides a
promising route to engineering new electronic instabilities in topological
quantum materials.

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The categories of this paper are: bayes-an
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio