Twisted magnon beams carrying orbital angular momentum.,Nature Communications

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Twisted magnon beams carrying orbital angular momentum.
Nature Communications ( IF 14.7 ) Pub Date : 2019-05-07 , DOI: 10.1038/s41467-019-10008-3
Chenglong Jia ₁ , Decheng Ma ₁ , Alexander F Schäffer ₂ , Jamal Berakdar ₂

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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.

中文翻译：

携带轨道角动量的扭曲磁振子束。

铁磁体的低能本征模激发是自旋波或磁振子，可以在磁子电路中触发和引导而不会产生欧姆损耗，因此对于信息通信和处理很有吸引力。在这里，我们提出了新型自旋波，其携带构成扭曲磁振子束的确定且电控的轨道角动量（OAM）。我们展示了扭曲光束如何在磁波导中出现，以及如何对它们进行拓扑量化和引导。一个重要的发现是，与特定梁的 OAM 相关的拓扑电荷可以在外部进行调节，并免受磁阻尼的影响。通过阿哈拉诺夫-卡舍尔效应耦合到外加电场可以改变拓扑电荷。这使得基于 OAM 的稳健、低能耗的多路磁波计算成为可能，类似于在光通信中使用光子 OAM 以及基于 OAM 的高纠缠研究，但这里的波长更短，能耗更低，并且易于集成在磁波电路中。

更新日期：2019-05-16

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