English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The search for novel topological phases of matter in quantum magnets hasemerged as a frontier of condensed matter physics. Here we use state-of-the-artangle-resolved photoemission spectroscopy (ARPES) to investigate singlecrystals of Co$_3$Sn$_2$S$_2$ in its ferromagnetic phase. We report for thefirst time signatures of a topological Weyl loop. From fundamental symmetryconsiderations, this magnetic Weyl loop is expected to be gapless if spin-orbitcoupling (SOC) is strictly zero but gapped, with possible Weyl points, underfinite SOC. We point out that high-resolution ARPES results to date cannotunambiguously resolve the SOC gap anywhere along the Weyl loop, leaving openthe possibility that Co$_3$Sn$_2$S$_2$ hosts zero Weyl points or some non-zeronumber of Weyl points. On the surface of our samples, we further observe apossible Fermi arc, but we are unable to clearly verify its topological natureusing the established counting criteria. As a result, we argue that from thepoint of view of photoemission spectroscopy the presence of Weyl points andFermi arcs in Co$_3$Sn$_2$S$_2$ remains ambiguous. Our results haveimplications for ongoing investigations of Co$_3$Sn$_2$S$_2$ and othertopological magnets.

Signatures of a topological Weyl loop in Co$_3$Sn$_2$S$_2$