Kondo-Weyl semimetal behavior in Ce<sub>3</sub>Bi<sub>4</sub>Pd<sub>3</sub>

 · Invited

Abstract

In heavy fermion systems the Kondo effect stabilizes strongly renormalized heavy electronic bands, and promotes novel quantum phases and excitations. Recently, the discovery of topologically non-trivial insulators, as well as Dirac and Weyl semimetals with 3D bulk linear electronic dispersion has triggered a lot of interest. So far, investigations have focused on non-interacting settings, but it is of great interest to also explore the interplay of strong correlations and topology. For this purpose we have searched for topologically non-trivial phases in heavy fermion systems. Indeed, by tuning the spin-orbit coupling strength by Pt-Pd substitution in Ce3Bi4(Pt,Pd)3, we have discovered a transformation from a Kondo insulator in Ce3Bi4Pt3 to a semimetal in Ce3Bi4Pd3 [1]. The latter shows the thermodynamic hallmark of strongly renormalized linear electronic bands [1], as recently predicted for a Weyl-Kondo semimetal [2]. Strikingly, as full Kondo coherence sets in, a large spontaneous Hall effect appears. As the material is entirely nonmagnetic, this is direct evidence of a huge Berry curvature dipole in the absence of time-reversal symmetry breaking. We attribute this effect to the topological nature of this noncentrosymmetric material, in the form of tilted Kondo-driven Weyl nodes [3].


[1] S. Dzsaber, L. Prochaska, A. Sidorenko, G. Eguchi, R. Svagera, M. Waas, A. Prokofiev, Q. Si, and S. Paschen, Kondo insulator to semimetal transformation tuned by spin-orbit coupling, Phys. Rev. Lett. 118, 246601 (2017).
[2] H.-H. Lai, S. E. Grefe, S. Paschen, and Q. Si, Weyl–Kondo semimetal in heavy-fermion systems, Proc. Natl. Acad. Sci. USA 115, 93 (2018).
[3] S. Dzsaber, X. Yan, G. Eguchi, A. Prokofiev, T. Shiroka, P. Blaha, O. Rubel, S. E. Grefe, H.-H. Lai, Q. Si, and S. Paschen, Giant spontaneous Hall effect in a nonmagnetic Weyl-Kondo semimetal, arXiv:1811.02819 (2018).

*Financial support from the Austrian Science Fund (P29296-N27 and DK W1243) is gratefully acknowledged.

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Presenters

  • Sami Dzsaber

    • Institute of Solid State Physics, , Wiedner Hauptstr. 8 -10, 1040 Vienna, Austria, Vienna University of Technology

Authors

  • Sami Dzsaber

    • Institute of Solid State Physics, , Wiedner Hauptstr. 8 -10, 1040 Vienna, Austria, Vienna University of Technology

  • Gaku Eguchi

    • Institute of Solid State Physics, , Wiedner Hauptstr. 8 -10, 1040 Vienna, Austria, Vienna University of Technology

  • Diego A Zocco

    • Institute of Solid State Physics, , Wiedner Hauptstr. 8 -10, 1040 Vienna, Austria, Vienna University of Technology

  • Andrei sidorenko

    • Institute of Solid State Physics, , Wiedner Hauptstr. 8 -10, 1040 Vienna, Austria, Vienna University of Technology

  • Xinlin Yan

    • Institute of Solid State Physics, , Wiedner Hauptstr. 8 -10, 1040 Vienna, Austria, Vienna University of Technology

  • Andrey Prokofiev

    • Institute of Solid State Physics, , Wiedner Hauptstr. 8 -10, 1040 Vienna, Austria, Vienna University of Technology
    • Vienna University of Technology

  • Lukas Prochaska

    • Institute of Solid State Physics, , Wiedner Hauptstr. 8 -10, 1040 Vienna, Austria, Vienna University of Technology

  • T. Shiroka

    • ETH Zurich, Paul Scherrer Institut, Switzerland

  • P. Blaha

    • Institute of Materials Chemistry, Vienna University of Technology, 1040 Vienna, Austria

  • O. Rubel

    • Department of Materials Science and Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada L8S 4L8

  • S.E. Grefe

    • Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA

  • H. H. Lai

    • Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA

  • Qimiao Si

    • Rice University
    • Department of Physics and Astronomy, Rice University
    • Department of Physics and Astronomy, Houston, Texas 77005, USA, Rice University

  • Silke Buehler-Paschen

    • Institute of Solid State Physics, Vienna University of Technology
    • Institute of Solid State Physics, , Wiedner Hauptstr. 8 -10, 1040 Vienna, Austria, Vienna University of Technology
    • Vienna University of Technology