Chiral coupling of magnons in waveguides

Journal article (2020)

Authors

T. Yu QN/Bauer Group - AS , Kavli institute of nanoscience Delft
Xiang Zhang Kavli institute of nanoscience Delft, QN/Blaauboer Group - AS
S. Sharma QN/Bauer Group - AS , Kavli institute of nanoscience Delft
Y.M. Blanter Kavli institute of nanoscience Delft, QN/Blanter Group - AS
G.E. Bauer Kavli institute of nanoscience Delft, QN/Bauer Group - AS , Tohoku University
Research Group
QN/Bauer Group (AS) (TU Delft)
Copyright: © 2020 T. Yu, Xiang Zhang, S. Sharma, Y.M. Blanter, G.E. Bauer
DOI: https://doi.org/10.1103/PhysRevB.101.094414
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Published Date

2020

Language

English

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Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Research Group

QN/Bauer Group

Abstract

We theoretically investigate the collective excitations of multiple (sub)millimeter-sized ferromagnets mediated by waveguide photons. By the position of the magnets in the waveguide, the magnon-photon coupling can be tuned to be chiral, i.e., magnons only couple with photons propagating in one direction, leading to an asymmetric transfer of angular momentum and energy between the magnets. A large enhancement of the magnon number population can be achieved at an edge of a long chain of magnets. The chain also supports standing waves with low radiation efficiency that are inert to the chirality.

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