Advances in Coherent Magnonics

Burkard Hillebrands, Technische Universität Kaiserslautern

September 24, 2021

Magnonics deals with dynamic excitations of magnetically ordered materials. These excitations—magnons—constitute a powerful tool for data processing on the micro and nanoscale. In this talk, I will provide an overview of the fundamentals and current trends in coherent magnonics [1]. I will discuss the implementation in magnetic systems of novel concepts borrowed from integrated optics. Examples are directional couplers and quantum-classical analogy devices, such as a magnonic Stimulated Raman Adiabatic Passage (STIRAP) device [2]. Also, I will address macroscopic quantum phenomena, such as coherent magnon Bose-Einstein condensates [3,4], and will present a way to enable room-temperature quantum computing functionalities using the magnon condensates.

[1]   P. Pirro, V. I. Vasyuchka, A. A. Serga, and B. Hillebrands, Advances in coherent magnonics, Nat. Rev. Mater. (2021).
[2]   Q. Wang, T. Brächer, M. Fleischhauer, B. Hillebrands, and P. Pirro, Stimulated-Raman-adiabatic-passage mechanism in a magnonic environment, Appl. Phys. Lett. 118, 182404 (2021).
[3]   M. Mohseni, A. Qaiumzadeh, A. A. Serga, A. Brataas, B. Hillebrands, and P. Pirro, Bose-Einstein condensation of nonequilibrium magnons in confined systems, New J. Phys. 22, 083080 (2020).
[4]    T. B. Noack, V. I. Vasyuchka, A. Pomyalov, V. S. L'vov, A. A. Serga, and B. Hillebrands, Evolution of room-temperature magnon gas: Toward a coherent Bose-Einstein condensate, Phys. Rev. B 104, L100410 (2021).