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Tunable Octdong and Spindle-Torus Fermi Surfaces in Kramers Nodal Line Metals

Author

Listed:
  • Gabriele Domaine

    (Max Planck Institut für Mikrostrukturphysik
    Max-Planck-Institut für Festkörperforschung)

  • Moritz M. Hirschmann

    (Max-Planck-Institut für Festkörperforschung
    RIKEN Center for Emergent Matter Science)

  • Kirill Parshukov

    (Max-Planck-Institut für Festkörperforschung)

  • Mihir Date

    (Max Planck Institut für Mikrostrukturphysik
    Harwell Science and Innovation Campus, Diamond Light Source Ltd)

  • Holger L. Meyerheim

    (Max Planck Institut für Mikrostrukturphysik)

  • Matthew D. Watson

    (Harwell Science and Innovation Campus, Diamond Light Source Ltd)

  • Katayoon Mohseni

    (Max Planck Institut für Mikrostrukturphysik)

  • Sydney K. Y. Dufresne

    (Max Planck Institut für Mikrostrukturphysik)

  • Shigemi Terakawa

    (Max Planck Institut für Mikrostrukturphysik
    The University of Osaka, Department of Applied Physics, Graduate School of Engineering
    The University of Osaka, Center for Future Innovation, Graduate School of Engineering)

  • Marcin Rosmus

    (Jagiellonian University, SOLARIS National Synchrotron Radiation Centre
    Institut des Sciences Moléculaires d’Orsay, Université Paris-Saclay, CNRS)

  • Natalia Olszowska

    (Jagiellonian University, SOLARIS National Synchrotron Radiation Centre)

  • Stuart S. P. Parkin

    (Max Planck Institut für Mikrostrukturphysik)

  • Andreas P. Schnyder

    (Max-Planck-Institut für Festkörperforschung)

  • Niels B. M. Schröter

    (Max Planck Institut für Mikrostrukturphysik
    Martin-Luther-Universität Halle-Wittenberg
    Halle-Berlin-Regensburg Cluster of Excellence CCE)

Abstract

Kramers nodal lines are doubly degenerate band crossings in achiral non-centrosymmetric crystals, arising from spin-orbit coupling and connecting time-reversal invariant momenta. When intersecting the Fermi level, they generate exotic three-dimensional Fermi surfaces, in some cases described by two-dimensional massless Dirac fermions, enabling enhanced graphene-like physics such as quantized optical conductivity and large anomalous Hall effects. However, no experimental realization of such materials has been reported. Here, we identify Kramers nodal line metals beyond the case of Fermi surfaces enclosing a single time-reversal invariant momentum. Using angle-resolved photoemission spectroscopy and first-principles calculations, we show that 3R-TaS2 and 3R-NbS2 host open Octdong and Spindle-torus Fermi surfaces, respectively. We observe a filling-controlled transition between these configurations and evidence of size quantization in 3R-TaS2 inclusions within 2H-TaS2. We further predict a strain- or pressure-driven transition to a conventional metal. Our results establish 3R transition-metal dichalcogenides as a tunable platform for Kramers nodal line physics.

Suggested Citation

  • Gabriele Domaine & Moritz M. Hirschmann & Kirill Parshukov & Mihir Date & Holger L. Meyerheim & Matthew D. Watson & Katayoon Mohseni & Sydney K. Y. Dufresne & Shigemi Terakawa & Marcin Rosmus & Natali, 2025. "Tunable Octdong and Spindle-Torus Fermi Surfaces in Kramers Nodal Line Metals," Nature Communications, Nature, vol. 16(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-66284-9
    DOI: 10.1038/s41467-025-66284-9
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    References listed on IDEAS

    as
    1. Jonas A. Krieger & Samuel Stolz & Iñigo Robredo & Kaustuv Manna & Emily C. McFarlane & Mihir Date & Banabir Pal & Jiabao Yang & Eduardo B. Guedes & J. Hugo Dil & Craig M. Polley & Mats Leandersson & C, 2024. "Weyl spin-momentum locking in a chiral topological semimetal," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
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    3. Ying-Ming Xie & Xue-Jian Gao & Xiao Yan Xu & Cheng-Ping Zhang & Jin-Xin Hu & Jason Z. Gao & K. T. Law, 2021. "Kramers nodal line metals," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
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