Steering between level repulsion and attraction: broad tunability of two-port driven cavity magnon-polaritons

Boventer, I., Kläui, M., Macêdo, R. and Weides, M. (2019) Steering between level repulsion and attraction: broad tunability of two-port driven cavity magnon-polaritons. New Journal of Physics, 21(12), 125001. (doi: 10.1088/1367-2630/ab5c12)

Abstract

Cavity-magnon polaritons (CMPs) are the associated quasiparticles of the hybridization between cavity photons and magnons in a magnetic sample placed in a microwave resonator. In the strong coupling regime, where the macroscopic coupling strength exceeds the individual dissipation, there is a coherent exchange of information. This renders CMPs as promising candidates for future applications such as in information processing. Recent advances on the study of the CMP now allow not only for creation of CMPs on demand, but also for tuning of the coupling strength—this can be thought of as the enhancement or suppression of information exchange. Here, we go beyond standard single-port driven CMPs and employ a two-port driven CMP. We control the coupling strength by the relative phase ϕ and amplitude field ratio δ0 between both ports. Specifically, we derive a new expression from input–output theory for the study of the two-port driven CMP and discuss the implications on the coupling strength. Furthermore, we examine intermediate cases where the relative phase is tuned between its maximal and minimal value and, in particular, the high δ0 regime, which has not been yet explored.

• Item Type: Articles
• Additional Information: This work is supported by the European Research Council (ERC) under the Grant Agreement 648011 and the DFG through SFB TRR 173/Spin+X. RM acknowledges the support of the Leverhulme Trust.
• Keywords: Cavity Optomagnonics, microwave cavity resonators, cavity-magnon-polaritons (CMPs), ferromagnetic resonance, hybrid systems, strong coupling.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Weides, Professor Martin and Macedo, Dr Rair
• Authors: Boventer, I., Kläui, M., Macêdo, R., and Weides, M.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: New Journal of Physics
• Publisher: IOP Publishing
• ISSN: 1367-2630
• ISSN (Online): 1367-2630
• Published Online: 27 November 2019
• Copyright Holders: Copyright © 2019 The Authors
• First Published: First published in New Journal of Physics 21(12):125001
• Publisher Policy: Reproduced under a Creative Commons License