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Visualizing a single wavefront dislocation induced by orbital angular momentum in graphene

Author

Listed:
  • Yi-Wen Liu

    (Beijing Normal University
    Ministry of Education)

  • Yu-Chen Zhuang

    (Peking University)

  • Ya-Ning Ren

    (Beijing Normal University
    Ministry of Education)

  • Chao Yan

    (Beijing Normal University
    Ministry of Education)

  • Xiao-Feng Zhou

    (Beijing Normal University
    Ministry of Education)

  • Qian Yang

    (Beijing Normal University
    Ministry of Education)

  • Qing-Feng Sun

    (Peking University
    Hefei National Laboratory)

  • Lin He

    (Beijing Normal University
    Ministry of Education)

Abstract

Phase singularities are phase-indeterminate points where wave amplitudes are zero, which manifest as phase vertices or wavefront dislocations. In the realm of optical and electron beams, the phase singularity has been extensively explored, demonstrating a profound connection to orbital angular momentum. Direct local imaging of the impact of orbital angular momentum on phase singularities at the nanoscale, however, remains challenging. Here, we study the role of orbital angular momentum in phase singularities in graphene, particularly at the atomic level, through scanning tunneling microscopy and spectroscopy. Our experiments demonstrate that the scatterings between different orbital angular momentum states, which are induced by local rotational symmetry-breaking potentials, can generate additional phase singularities, and result in robust single-wavefront dislocations in real space. Our results pave the way for exploring the effects of orbital degree of freedom on quantum phases in quasiparticle interference processes.

Suggested Citation

  • Yi-Wen Liu & Yu-Chen Zhuang & Ya-Ning Ren & Chao Yan & Xiao-Feng Zhou & Qian Yang & Qing-Feng Sun & Lin He, 2024. "Visualizing a single wavefront dislocation induced by orbital angular momentum in graphene," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47756-w
    DOI: 10.1038/s41467-024-47756-w
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    References listed on IDEAS

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    1. Michael Berry, 2000. "Making waves in physics," Nature, Nature, vol. 403(6765), pages 21-21, January.
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