Coherent and dissipative cavity magnonics

Harder, Michael; Yao, Bing; Gui, Y. S.; Hu, C.‐M.

doi:10.1063/5.0046202

Cited by 73 publications

(27 citation statements)

References 124 publications

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“…|Σ| does not depend on distance because we assume sufficiently high quality of waveguide and magnets, but we will discuss the novel effect of dissipation [387] at the end of this part. Coupling dissipative systems by traveling waves is a very general problem that recently attracts much attention [388][389][390]. While the input-output theory (Sec.…”

Section: Spin Skin Effectmentioning

confidence: 99%

Chirality as Generalized Spin-Orbit Interaction in Spintronics

Chen¹,

Luo²,

Bauer³

2022

Preprint

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Chirality or handedness is a digital relation between three vectors that distinguishes an object from its mirror image, such as the spread fingers of the right and left hand. The chirality of ground state magnetic textures defined by the vectors of magnetization, its gradient, and an electric field from broken inversion symmetry can be fixed by a strong relativistic spin-orbit interaction. This review focuses on the chirality observed in the excited states of the magnetic order, dielectrics, and conductors that hold transverse spins when they are evanescent. Even without any relativistic effect, the transverse spin of the evanescent waves are locked to the momentum and the surface normal of their propagation plane. This chirality thereby acts as a generalized spin-orbit interaction, which leads to the discovery of various chiral interactions between magnetic, phononic, electronic, photonic, and plasmonic excitations in spintronics that mediate the excitation of quasiparticles into a single direction, leading to phenomena such as chiral spin and phonon pumping, chiral spin Seebeck, spin skin, magnonic trap, magnon Doppler, and spin diode effects. Intriguing analogies with electric counterparts in the nano-optics and plasmonics exist. After a brief review of the concepts of chirality that characterize the ground state chiral magnetic textures and chirally coupled magnets in spintronics, we turn to the chiral phenomena of excited states. We present a unified electrodynamic picture for dynamical chirality in spintronics in terms of generalized spin-orbit interaction and compare it with that in nano-optics and plasmonics. Based on the general theory, we subsequently review the theoretical progress and experimental evidence of chiral interaction, as well as the near-field transfer of the transverse spins, between various excitations in magnetic, photonic, electronic and phononic nanostructures at GHz time scales. We provide a perspective for future research before concluding this article.

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Section: Spin Skin Effectmentioning

confidence: 99%

Chirality as Generalized Spin-Orbit Interaction in Spintronics

Chen¹,

Luo²,

Bauer³

2022

Preprint

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“…Here, we mention some recent reviews on cavity spintronics [319][320][321]. Li et al [319] outline the potential of hybrid magnetic systems for transformative applications in devices, circuits and information processing.…”

Section: Hybrid Magnon-photon System 411 Overview: Classical or Quantum?mentioning

confidence: 99%

“…Li et al [319] outline the potential of hybrid magnetic systems for transformative applications in devices, circuits and information processing. Harder et al [320] focused on the coherent and dissipative coupling characterized by level repulsion and attraction respectively. Rameshti et al [321] reviewed the coupling of magnons with photons at frequencies ranging from microwaves to optical regimes.…”

Section: Hybrid Magnon-photon System 411 Overview: Classical or Quantum?mentioning

confidence: 99%

Quantum magnonics: when magnon spintronics meets quantum information science

Yuan,

Cao,

Kamra

et al. 2021

Preprint

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Spintronics and quantum information science are two promising candidates for innovating information processing technologies. The combination of these two fields enables us to build solid-state platforms for studying quantum phenomena and for realizing multi-functional quantum tasks. For a long time, however, the intersection of these two fields was limited due to the distinct properties of the classical magnetization, that is manipulated in spintronics, and quantum bits, that are utilized in quantum information science. This situation has changed significantly over the last few years because of the remarkable progress in coding and processing information using magnons. On the other hand, significant advances in understanding the entanglement of quasi-particles and in designing high-quality qubits and photonic cavities for quantum information processing provide physical platforms to integrate magnons with quantum systems. From these endeavours, the highly interdisciplinary field of quantum magnonics emerges, which combines spintronics, quantum optics and quantum information science. Here, we give an overview of the recent developments concerning the quantum states of magnons and their hybridization with mature quantum platforms. First, we review the basic concepts of magnons and quantum entanglement and discuss the generation and manipulation of quantum states of magnons, such as single-magnon states, squeezed states and quantum many-body states including Bose-Einstein condensation and the resulting spin superfluidity. We discuss how magnonic systems can be integrated and entangled with quantum platforms including cavity photons, superconducting qubits, nitrogen-vacancy centers, and phonons for coherent information transfer and collaborative information processing. The implications of these hybrid quantum systems for non-Hermitian physics and parity-time symmetry are highlighted, together with applications in quantum memories and high-precision measurements. Finally, we present an outlook on some of the challenges and opportunities in quantum magnonics.

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“…This is a dynamic regime characterized by a region where the energy levels of the interacting cavity system coalesce [4]. The appearance of exceptional points delineating the attraction is a non-Hermitian phenomenon [5,6] that can take place in driven systems for some types of dissipation [7][8][9]. The energy levels near the exceptional points are sensitive to manipulation through external parameters and are potentially useful for mode control and sensing [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Mode attraction in Floquet systems with memory: Application to magnonics

Proskurin

Iyaro²,

Stamps³

2022

Phys. Rev. B

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Level attraction is a type of mode hybridization in open systems where instead of forming a hybridization gap, the energy spectrum of two modes coalesce in a region bounded by exceptional points. We demonstrate that this phenomenon can be realized in a Floquet system with memory, which appears in describing linear excitations in a nonlinear driven system with a limit cycle. Linear response of the system in this state is different from its response near thermodynamic equilibrium. We develop a general formalism and provide an example in the context of cavity magnonics, where we show that magnetic excitations in systems driven far from the equilibrium may show level attraction with cavity photons. Our approach works equally well for quantum and semiclassical magnetic dynamics. The theory is formulated so that it can be used in combination with micromagnetic simulations to explore a wide range of experimentally interesting systems.

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Coherent and dissipative cavity magnonics

Cited by 73 publications

References 124 publications

Chirality as Generalized Spin-Orbit Interaction in Spintronics

Chirality as Generalized Spin-Orbit Interaction in Spintronics

Quantum magnonics: when magnon spintronics meets quantum information science

Mode attraction in Floquet systems with memory: Application to magnonics

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