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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Quantum materials hosting Weyl fermions have opened a new era of research incondensed matter physics. First proposed in 1929 in particle physics, Weylfermions have yet to be observed as elementary particles. In 2015, Weylfermions were detected as collective electronic excitations in the strongspin-orbit coupled material tantalum arsenide, TaAs. This discovery wasfollowed by a flurry of experimental and theoretical explorations of Weylphenomena in materials. Weyl materials naturally lend themselves to theexploration of the topological index associated with Weyl fermions and theirdivergent Berry curvature field, as well as the topological bulk-boundarycorrespondence giving rise to protected conducting surface states. Here, wereview the broader class of Weyl topological phenomena in materials, startingwith the observation of emergent Weyl fermions in the bulk and of Fermi arcstates on the surface of the TaAs family of crystals by photoemissionspectroscopy. We then discuss some of the exotic optical and magnetic responsesobserved in these materials, as well as the progress in developing some of therelated chiral materials. We discuss the conceptual development of high-foldchiral fermions, which generalize Weyl fermions, and we review the observationof high-fold chiral fermion phases by taking the rhodium silicide, RhSi, familyof crystals as a prime example. Lastly, we discuss recent advances in Weyl-linephases in magnetic topological materials. With this Review, we aim to providean introduction to the basic concepts underlying Weyl physics in condensedmatter, and to representative materials and their electronic structures andtopology as revealed by spectroscopic studies. We hope this work serves as aguide for future theoretical and experimental explorations of chiral fermionsand related topological quantum systems with potentially enhancedfunctionalities.

Weyl, Dirac and high-fold chiral fermions in topological quantum materials