Magnon-induced absorption via quantum interference.

Area of Science:

• Quantum optics
• Condensed matter physics
• Cavity magnonics

Background:

• Magnon-induced absorption (MIA) is a phenomenon in magnonics systems.
• Two-cavity systems offer complex interactions for manipulating quantum phenomena.
• Yttrium iron garnet (YIG) spheres are key components in magnonics research.

Purpose of the Study:

• To propose and analyze a scheme for generating tunable magnon-induced absorption (MIA).
• To explore interference pathways in a coupled two-cavity magnonics system.
• To investigate the potential for remote magnon detection.

Main Methods:

• Utilizing a two-cavity magnonics system with a YIG sphere.
• Analyzing photon and magnon-photon coupling.
• Solving analytical results for probe absorption using bright and dark modes in a dressed-state picture.
• Investigating noise spectral density (NSD).

Main Results:

• Achieved conversion from suppression to enhancement of MIA on resonance.
• Accurately explained absorption peak characteristics (position, width, height) via analytical solutions.
• Observed similar MIA phenomena in the noise spectral density (NSD).

Conclusions:

• The proposed scheme enables tunable MIA in coupled cavities.
• The dressed-state picture accurately describes the observed absorption.
• The findings suggest a feasible optical method for remote magnon detection.