Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 118, Issue 8, Pages -Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2013386118
Keywords
Weyl semimetal; Kondo effect; spontaneous Hall effect; preserved time-reversal symmetry
Categories
Funding
- Austrian Science Fund (FWF) [P29279-N27, P29296-N27, DK W1243]
- European Union [EMP-824109]
- Swiss National Science Foundation (SNF) [200021-169455]
- NSF [DMR-1920740, PHY-1607611]
- Robert A. Welch Foundation [C-1411]
- Center for Nonlinear Studies at Los Alamos National Laboratory
- Austrian Science Fund (FWF) [P29279, P29296] Funding Source: Austrian Science Fund (FWF)
- Swiss National Science Foundation (SNF) [200021_169455] Funding Source: Swiss National Science Foundation (SNF)
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The discovery of a giant spontaneous Hall effect in the Kondo semimetal Ce3Bi4Pd3, attributed to Weyl nodes emerging due to the Kondo interaction, showcases an extreme topological response. This phenomenon differs from previously detected anomalous Hall effect in materials with broken time-reversal symmetry, and requires a beyond-perturbation-theory description.
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.
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