Magnon-exciton proximity coupling at a van der Waals heterointerface

Abstract

Spin and photonic systems are at the heart of modern information devices and emerging quantum technologies. An interplay between electron-hole pairs (excitons) in semiconductors and collective spin excitations (magnons) in magnetic crystals would bridge these heterogeneous systems, leveraging their individual assets in novel interconnected devices. Here, we report the magnon-exciton coupling at the interface between a magnetic thin film and an atomically-thin semiconductor. Our approach allies the long-lived magnons hosted in a film of yttrium iron garnet (YIG) to strongly-bound excitons in a flake of a transition metal dichalcogenide, MoSe${}_2$. The magnons induce on the excitons a dynamical valley Zeeman effect ruled by interfacial exchange interactions. This nascent class of hybrid system suggests new opportunities for information transduction between microwave and optical regions.

23 pages with 14 figures

References in corpus (9)

• Magnetic Control of Valley Pseudospin in Monolayer WSe2
• Valley Zeeman Effect in Elementary Optical Excitations of a Monolayer WSe2
• Hybrid quantum systems based on magnonics
• Valley Splitting and Polarization by the Zeeman Effect in Monolayer MoSe2
• Perspectives on quantum transduction
• Atomically thin mirrors made of monolayer semiconductors
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• Observation of Magnetic Proximity Effect Using Resonant Optical Spectroscopy of an Electrically Tunable MoSe${}_2$/CrBr${}_3$ Heterostructure
• Valley-dependent spin transport in monolayer transition-metal dichalcogenides