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Charge density wave induced nodal lines in LaTe3

Author

Listed:
  • Shuvam Sarkar

    (UGC-DAE Consortium for Scientific Research)

  • Joydipto Bhattacharya

    (Theory and Simulations Laboratory, Raja Ramanna Centre for Advanced Technology
    Homi Bhabha National Institute, Training School Complex)

  • Pampa Sadhukhan

    (UGC-DAE Consortium for Scientific Research)

  • Davide Curcio

    (Interdisciplinary Nanoscience Center (iNANO), Aarhus University)

  • Rajeev Dutt

    (Theory and Simulations Laboratory, Raja Ramanna Centre for Advanced Technology
    Homi Bhabha National Institute, Training School Complex)

  • Vipin Kumar Singh

    (UGC-DAE Consortium for Scientific Research)

  • Marco Bianchi

    (Interdisciplinary Nanoscience Center (iNANO), Aarhus University)

  • Arnab Pariari

    (Saha Institute of Nuclear Physics, HBNI)

  • Shubhankar Roy

    (Vidyasagar Metropolitan College)

  • Prabhat Mandal

    (Saha Institute of Nuclear Physics, HBNI)

  • Tanmoy Das

    (Indian Institute of Science)

  • Philip Hofmann

    (Interdisciplinary Nanoscience Center (iNANO), Aarhus University)

  • Aparna Chakrabarti

    (Theory and Simulations Laboratory, Raja Ramanna Centre for Advanced Technology
    Homi Bhabha National Institute, Training School Complex)

  • Sudipta Roy Barman

    (UGC-DAE Consortium for Scientific Research)

Abstract

LaTe3 is a non-centrosymmetric material with time reversal symmetry, where the charge density wave is hosted by the Te bilayers. Here, we show that LaTe3 hosts a Kramers nodal line—a twofold degenerate nodal line connecting time reversal-invariant momenta. We use angle-resolved photoemission spectroscopy, density functional theory with an experimentally reported modulated structure, effective band structures calculated by band unfolding, and symmetry arguments to reveal the Kramers nodal line. Furthermore, calculations confirm that the nodal line imposes gapless crossings between the bilayer-split charge density wave-induced shadow bands and the main bands. In excellent agreement with the calculations, spectroscopic data confirm the presence of the Kramers nodal line and show that the crossings traverse the Fermi level. Furthermore, spinless nodal lines—completely gapped out by spin-orbit coupling—are formed by the linear crossings of the shadow and main bands with a high Fermi velocity.

Suggested Citation

  • Shuvam Sarkar & Joydipto Bhattacharya & Pampa Sadhukhan & Davide Curcio & Rajeev Dutt & Vipin Kumar Singh & Marco Bianchi & Arnab Pariari & Shubhankar Roy & Prabhat Mandal & Tanmoy Das & Philip Hofman, 2023. "Charge density wave induced nodal lines in LaTe3," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-39271-1
    DOI: 10.1038/s41467-023-39271-1
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