Quantum Anomalies in Strained Weyl Semimetals

ORAL

Abstract

The chiral anomaly gives the topological response of Weyl semimetals to an external perturbation, insensitive to local details of the Hamiltonian. The recent identification of strain as axial fields in these materials gives rise to other anomalies, known from high-energy theory. However, these anomalies driven by axial fields are not necessary gauge-invariant or charge-conserving; in fact, two different formulations exist, realizing just one of these conditions. In this work, we propose a way to resolve this ambiguity, supported by a lattice model that provides an intuitive picture. We identify experimental signatures and argue about their stability in presence of disorder.

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Presenters

  • Jan Behrends

    • Max Planck Institute for the Physics of Complex Systems

Authors

  • Sthitadhi Roy

    • Max Planck Institute for the Physics of Complex Systems

  • Jan Behrends

    • Max Planck Institute for the Physics of Complex Systems

  • Adolfo Grushin

    • Physics, Univ of California - Berkeley
    • Physics, University of California, Berkeley
    • CNRS, Neel Institute
    • Department of Physics, University of California
    • Institute Neel, CNRS

  • Michael Kolodrubetz

    • University of California Berkeley
    • Univ of California - Berkeley; LBNL
    • University of California

  • Nathan Goldman

    • Center for Nonlinear Phenomena and Complex Systems, Universite Libre de Bruxelles

  • Jens Bardarson

    • Physics, KTH Royal Insitute of Technology
    • Max Planck PKS
    • KTH Royal Institute of Technology
    • Phyiscs, KTH Royal Institute of Technology

  • Roni Ilan

    • Tel Aviv University
    • Physics, Tel-Aviv University