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Active ballistic orbital transport in Ni/Pt heterostructure

Author

Listed:
  • Sobhan Subhra Mishra

    (Nanyang Technological University
    Nanyang Technological University)

  • James Lourembam

    (Technology and Research)

  • Dennis Jing Xiong Lin

    (Technology and Research)

  • Ranjan Singh

    (Nanyang Technological University
    Nanyang Technological University)

Abstract

Orbital current, defined as the orbital character of Bloch states in solids, can travel with larger coherence length through a broader range of materials than its spin counterpart, facilitating a robust, higher density and energy efficient information transmission. Hence, active control of orbital transport plays a pivotal role in the progress of the evolving field of quantum information technology. Unlike spin angular momentum, orbital angular momentum couples to phonon angular momentum efficiently via orbital-crystal momentum (L-k) coupling, allowing us to control orbital transport through crystal field potential mediated angular momentum transfer. Here, leveraging the orbital dependant efficient L-k coupling, we have experimentally demonstrated the active control of orbital current velocity in Ni/Pt heterostructure. We observe terahertz emission from Ni/Pt heterostructure via long-range ballistic orbital transport, as evidenced by the delay, and chirping in the emitted THz pulse correlating with increased Pt thickness. Additionally, we also have identified a critical energy density required to overcome collisions in orbital transport, enabling a swifter flow of orbital current. Femtosecond light driven active control of the ballistic orbital transport lays the foundation for the development of dynamic optorbitronics for transmitting information over extended distance.

Suggested Citation

  • Sobhan Subhra Mishra & James Lourembam & Dennis Jing Xiong Lin & Ranjan Singh, 2024. "Active ballistic orbital transport in Ni/Pt heterostructure," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-48891-0
    DOI: 10.1038/s41467-024-48891-0
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    References listed on IDEAS

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    1. Gyung-Min Choi & Byoung-Chul Min & Kyung-Jin Lee & David G. Cahill, 2014. "Spin current generated by thermally driven ultrafast demagnetization," Nature Communications, Nature, vol. 5(1), pages 1-8, September.
    2. Piyush Agarwal & Lisen Huang & Sze Lim & Ranjan Singh, 2022. "Electric-field control of nonlinear THz spintronic emitters," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    3. Sandeep Kumar & Sunil Kumar, 2023. "Ultrafast THz probing of nonlocal orbital current in transverse multilayer metallic heterostructures," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    4. Wentao Zhang & Pablo Maldonado & Zuanming Jin & Tom S. Seifert & Jacek Arabski & Guy Schmerber & Eric Beaurepaire & Mischa Bonn & Tobias Kampfrath & Peter M. Oppeneer & Dmitry Turchinovich, 2020. "Ultrafast terahertz magnetometry," Nature Communications, Nature, vol. 11(1), pages 1-9, December.
    5. Siyuan Luo & Li He & Mo Li, 2017. "Spin-momentum locked interaction between guided photons and surface electrons in topological insulators," Nature Communications, Nature, vol. 8(1), pages 1-7, December.
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