Weyl-Kondo semimetals in a non-centrosymmetric three-dimensional lattice

ORAL

Abstract

The spin-orbit coupling and electron correlations of heavy fermion systems make them a rich playground for a variety of quantum phases, including those with topological characteristics. Motivated by the recent finding of a Dirac-Kondo semimetal phase in a two-dimensional model [1], we study the Anderson lattice model in an inversion-symmetry-breaking lattice in three dimensions. Both the weak coupling and strong coupling limits are analyzed. In both parameter regimes, we identify a Weyl-Kondo semimetal (WKSM) phase. In the strong coupling regime, the quasiparticles near the Weyl nodes have velocities that are strongly reduced by the interaction effects, corresponding to a narrow band, which will make them readily amenable to studies by thermodynamic and thermoelectric means. We also determine the surface states of the WKSM phase, and demonstrate how they manifest the correlation effects. [1] X.-Y. Feng, H. Zhong, J. Dai, Q. Si, ``Dirac-Kondo semimetals and topological Kondo insulators in the dilute carrier limit,'' arXiv:1605.02380

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Authors

  • Sarah Elaine Grefe

    Department of Physics & Astronomy, Rice University, Houston, Texas 77005, USA, Rice University

  • Hsin-Hua Lai

    Department of Physics & Astronomy, Rice University, Houston, Texas 77005, USA, Rice University

  • Silke Paschen

    Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstra{\ss}e 8-10, 1040 Vienna, Austria, Institute of Solid State Physics, Vienna University of Technology

  • Qimiao Si

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