
Open access
Date
2021-02-23Type
- Journal Article
Citations
Cited 14 times in
Web of Science
Cited 13 times in
Scopus
ETH Bibliography
yes
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Abstract
Nontrivial topology in condensed-matter systems enriches quantum states of matter to go beyond either the classification into metals and insulators in terms of conventional band theory or that of symmetry-broken phases by Landau’s order parameter framework. So far, focus has been on weakly interacting systems, and little is known about the limit of strong electron correlations. Heavy fermion systems are a highly versatile platform to explore this regime. Here we report the discovery of a giant spontaneous Hall effect in the Kondo semimetal Ce3Bi4Pd3 that is noncentrosymmetric but preserves time-reversal symmetry. We attribute this finding to Weyl nodes—singularities of the Berry curvature—that emerge in the immediate vicinity of the Fermi level due to the Kondo interaction. We stress that this phenomenon is distinct from the previously detected anomalous Hall effect in materials with broken time-reversal symmetry; instead, it manifests an extreme topological response that requires a beyond-perturbation-theory description of the previously proposed nonlinear Hall effect. The large magnitude of the effect in even tiny electric and zero magnetic fields as well as its robust bulk nature may aid the exploitation in topological quantum devices. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000472630Publication status
publishedExternal links
Journal / series
Proceedings of the National Academy of Sciences of the United States of AmericaVolume
Pages / Article No.
Publisher
National Academy of SciencesSubject
Weyl semimetal; Kondo effect; spontaneous Hall effect; preserved time-reversal symmetryFunding
169455 - Exotic matter and correlated quantum phenomena (SNF)
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Show all metadata
Citations
Cited 14 times in
Web of Science
Cited 13 times in
Scopus
ETH Bibliography
yes
Altmetrics