Design of cavity magnonic devices based on the dynamics of cavity magnon polaritons
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Date
2021-02-04
Authors
Rao, Jinwei
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Abstract
As a new platform for studying light-matter interactions, cavity magnonics has attracted increasing attention in the past decade, because of its promising applications in quantum information processing and spintronics. In such hybrid systems, the strong interaction between cavity photons and ferromagnetic magnons generates cavity magnon polaritons (CMPs), which acquire complementary properties with both the high movability of the microwave photon and the long coherence time of the ferromagnetic spin. On one hand, high movability enables CMP as an excellent information carrier and offers cavity magnonic systems vast ductility. Components with distinct properties can be integrated into the cavity magnonic device to extend its functionality. On the other hand, by taking advantage of the long coherence time, CMP can be a promising candidate to preserve entanglement states in quantum information processing. Based on this versatile platform, technologies have flourished, including gradient memory architecture, single magnon detection, non-local spin current manipulation, and unidirectional invisibility etc.
In this thesis, we explore cavity magnonics by designing new cavity magnonic devices based on the dynamics of CMPs. In Chapter 3, we fabricate two cavity magnonic devices with multi-channels. By utilizing the interference between two degenerate channels, a logic gate based on the analogue dynamic Hall effect of CMPs is designed. Additionally, by utilizing the interference between two non-degenerate channels mediated by a magnon mode, a coherent perfect absorber is achieved. In Chapter 4, we introduce the gain mechanism into cavity magnonics and discover the cooperative dynamics of CMPs in a feedback-coupled cavity. Following this work, the electric control of the cooperative dynamics of CMPs is demonstrated. In Chapter 5, we study the photon-magnon interaction in an open system and discover the dissipative photon-magnon coupling effect. To further understand this effect, we study the indirect interactions between a cavity photon mode and a separated magnon mode, and attribute the physical origin of the dissipative coupling effect to traveling waves. Our works extend the research of cavity magnonics to three different directions: multi-channel, active and open boundary. The devices and techniques developed in this thesis may pave ways for future study of cavity magnonics.
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cavity magnonics, cavity magnon polariton, photon-magnon interaction, coherent coupling, dissipative coupling