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MA: Fachverband Magnetismus
MA 23: Functional Antiferromagnetism
MA 23.13: Vortrag
Dienstag, 17. März 2020, 12:45–13:00, HSZ 401
Chiral Logic Computing with Twisted Modes in Antiferromagnetic Magnonic Waveguides — •Alexander F. Schäffer1, Min Chen2, Chenglong Jia2, and Jamal Berakdar1 — 1Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle (Saale), Germany — 2Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education & Institute of Theoretical Physics, Lanzhou University, China
Antiferromagnetic (AFM) materials are demonstrated to offer a new exciting platform for ultrafast information processing with low cross talks and good compatibility with existing technology. Particularly interesting for energy-saving computing are low-energy AFM excitations, or magnons. For an AFM waveguide we prove the existence of chiral magnonic eigenmodes that possess a well-defined projection of the angular momentum (AM) along the wave propagation direction. The AM is an unbounded integer determined by the spatial topology of the respective mode and is shown to be exploitable for multiplex AFM magnonic computing. We demonstrate how a variety of symmetry and topology protected logic gates can be realized and operated without Joule heating. A Dzyaloshinskii-Moriya interaction arising at the waveguide boundary allows for a coupling to an external electric field and results in a Faraday effect. Our findings uncover a new aspect of AFM spintronics and point to a novel route to communicating and handling data swiftly, with high fidelity and at low energy cost.