Transport signatures of Fermi arcs at twin boundaries in Weyl materials

ORAL

Abstract

One of the most striking signatures of Weyl fermions is their surface Fermi arcs. Less known is that Fermi arcs can also be localized at internal twin boundaries where two Weyl materials of opposite chirality meet. In this work, we derive constraints on the topology and connectivity of these ``internal Fermi arcs.'' We show that internal Fermi arcs can exhibit transport signatures and propose two probes: quantum oscillations and a quantized chiral magnetic current. We propose merohedrally twinned B20 materials as candidates to host internal Fermi arcs, verified through both model and ab initio calculations. Our theoretical investigation sheds light on the topological features and motivates experimental studies into the intriguing physics of internal Fermi arcs.

*This material is based upon work supported in part by the US Department of Energy under Award DE-SC0017662 (S.K.), the US National Science Foundation under Grant No. DMR-1942447 (J.C.), and the Gordon and Betty Moore Foundation's EPIQS initiative through Grant GBMF9064 (N.M.). M.G.V. and I.R. acknowledge the Spanish Ministerio de Ciencia e Innovaci'{o}n (grant PID2019-109905GB-C21), Programa Red Guipuzcoana de Ciencia, Tecnolog'{i}a e Innovaci'{o}n 2021 No. 2021-CIEN-000070-01 Gipuzkoa Next and the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) GA 3314/1-1 - FOR 5249 (QUAST).L.M.S. acknowledges support by the Gordon and Betty Moore foundation (EPIQS initiative), award number GBMF9064, by the Princeton Center for Complex Materials, a US National Science Foundation (NSF)-MRSEC program (DMR-2011750), the Packard and Sloan foundation.

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Publication: arXiv:2207.14109

Presenters

  • Sahal Kaushik

    • NORDITA

Authors

  • Sahal Kaushik

    • NORDITA

  • Nitish Mathur

    • University of Wisconsin - Madison

  • Iñigo Robredo

    • Max Planck Institute CPFS

  • Leslie M Schoop

    • Princeton University

  • Song Jing

    • University of Wisconsin - Madison

  • Maia Garcia Vergniory

    • Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
    • Donostia International Physics Center, P. Manuel de Lardizabal 4, 20018 Donostia-San Sebastian, Spain
    • Donostia International Physics Center and Max Planck Institute for Chemical Physics of Solids
    • Max Planck Institute for Chemical Physics of Solids
    • Max Planck Institute CPFS
    • Donostia International Physics Center

  • Jennifer Cano

    • Stony Brook University
    • Stonybrook University