Giant spontaneous Hall effect in a nonmagnetic Weyl-Kondo semimetal Academic Article uri icon

  •  
  • Overview
  •  
  • Research
  •  
  • View All
  •  

abstract

  • Exploring effects of topology in condensed matter systems [1] has led to the discovery of fundamentally new quantum phases and phenomena [2], including the spin Hall effect [3], protected transport of helical fermions [4], topological superconductivity [5], and large nonlinear optical response [6,7]. So far, focus has been on weakly interacting systems, but it is clear that the interplay of strong correlations and topology has many further surprises in store [8,9]. Heavy fermion systems are a highly versatile platform to reveal them [10,11]. Here we report the discovery of a giant spontaneous Hall effect in the noncentrosymmetric Kondo semimetal Ce$_3$Bi$_4$Pd$_3$ (ref 10), under preserved time reversal symmetry (TRS). We attribute it to Weyl nodes - singularities of the Berry curvature - Kondo-driven to the immediate vicinity of the Fermi level. We stress that this phenomenon is distinct from the previously detected anomalous Hall response in systems with broken TRS [12-15] and that its characteristics require a description beyond the nonlinear quantum Hall effect [16]. The astonishingly 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.

authors

  • Dzsaber, Sami
  • Yan, Xinlin
  • Taupin, Mathieu
  • Eguchi, Gaku
  • Prokofiev, Andrey
  • Shiroka, Toni
  • Blaha, Peter
  • Rubel, Oleg
  • Grefe, Sarah E
  • Lai, Hsin-Hua
  • Si, Qimiao
  • Paschen, Silke