Giant spontaneous Hall effect in a nonmagnetic Weyl–Kondo semimetal

• DOI: 10.1073/pnas.2013386118
• Publication Date: 2021-02-19T21:17:20Z
• Authors: Sami Dzsaber; Xinlin Yan; Mathieu Taupin; Gaku Eguchi; Andrey Prokofiev; Toni Shiroka; Peter Blaha; Oleg Rubel; Sarah E. Grefe; Hsin-Hua Lai; Qimiao Si; Silke Paschen
• Keywords: Weyl semimetal

Nontrivial topology in condensed matter systems enriches quantum states of matter, to go beyond either the classification into metals and insulators terms conventional band theory or that symmetry broken phases by Landau's order parameter framework. So far, focus has been on weakly interacting systems, little is known about limit strong electron correlations. Heavy fermion are a highly versatile platform explore this regime. Here we report discovery giant spontaneous Hall effect Kondo semimetal Ce3Bi4Pd3 noncentrosymmetric but preserves time reversal symmetry. We attribute finding Weyl nodes - singularities Berry curvature emerge immediate vicinity Fermi level due interaction. stress phenomenon distinct from previously detected anomalous materials with symmetry; instead, it manifests an extreme topological response requires beyond-perturbation-theory description proposed nonlinear effect. The large magnitude even tiny electric zero magnetic fields, as well its robust bulk nature may aid exploitation devices.