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Twisted magnon beams carrying orbital angular momentum

Author

Listed:
  • Chenglong Jia

    (Lanzhou University)

  • Decheng Ma

    (Lanzhou University)

  • Alexander F. Schäffer

    (Martin-Luther-Universität Halle-Wittenberg)

  • Jamal Berakdar

    (Martin-Luther-Universität Halle-Wittenberg)

Abstract

Low-energy eigenmode excitations of ferromagnets are spin waves or magnons that can be triggered and guided in magnonic circuits without Ohmic losses and hence are attractive for communicating and processing information. Here we present new types of spin waves that carry a definite and electrically controllable orbital angular momentum (OAM) constituting twisted magnon beams. We show how twisted beams emerge in magnonic waveguides and how to topologically quantify and steer them. A key finding is that the topological charge associated with OAM of a particular beam is tunable externally and protected against magnetic damping. Coupling to an applied electric field via the Aharanov-Casher effect allows for varying the topological charge. This renders possible OAM-based robust, low-energy consuming multiplex magnonic computing, analogously to using photonic OAM in optical communications, and high OAM-based entanglement studies, but here at shorter wavelengths, lower energy consumption, and ready integration in magnonic circuits.

Suggested Citation

  • Chenglong Jia & Decheng Ma & Alexander F. Schäffer & Jamal Berakdar, 2019. "Twisted magnon beams carrying orbital angular momentum," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-10008-3
    DOI: 10.1038/s41467-019-10008-3
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