Steering magnonic dynamics and permeability at exceptional points in a parity–time symmetric waveguide

Wang, Xi-guang; Guo, Gepu; Berakdar, J.

doi:10.1038/s41467-020-19431-3

Cited by 34 publications

(27 citation statements)

References 60 publications

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“…More recent theoretical work suggests that other attributes of magnons, such as non-reciprocal spin wave propagation, can be manipulated in the vicinity of an EP. 148 An unexplored direction to consider involves the magnon-magnon interaction between modes near an EP. Once an EP is reached, the acoustic and optical branches coalesce, and only one magnon mode is present.…”

Section: Exceptional Points In Synthetic Magnetsmentioning

confidence: 99%

Quantum Engineering With Hybrid Magnonic Systems and Materials (Invited Paper)

Awschalom

et al. 2021

IEEE Trans. Quantum Eng.

105

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Quantum technology has made tremendous strides over the past two decades with remarkable advances in materials engineering, circuit design and dynamic operation. In particular, the integration of different quantum modules has benefited from hybrid quantum systems, which provide an important pathway for harnessing the different natural advantages of complementary quantum systems and for engineering new functionalities. This review focuses on the current frontiers with respect to utilizing magnetic excitatons or magnons for novel quantum functionality. Magnons are the fundamental excitations of magnetically ordered solid-state materials and provide great tunability and flexibility for interacting with various quantum modules for integration in diverse quantum systems. The concomitant rich variety of physics and material selections enable exploration of novel quantum phenomena in materials science and engineering. In addition, the relative ease of generating strong coupling and forming hybrid dynamic systems with other excitations makes hybrid magnonics a unique platform for quantum engineering. We start our discussion with circuit-based hybrid magnonic systems, which are coupled with microwave photons and acoustic phonons. Subsequently, we are focusing on the recent progress of magnon-magnon coupling within confined magnetic systems. Next we highlight new opportunities for understanding the interactions between magnons and nitrogen-vacancy centers for quantum sensing and implementing quantum interconnects. Lastly, we focus on the spin excitations and magnon spectra of novel quantum materials investigated with advanced optical characterization.

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Section: Exceptional Points In Synthetic Magnetsmentioning

confidence: 99%

Quantum Engineering With Hybrid Magnonic Systems and Materials (Invited Paper)

Awschalom

et al. 2021

IEEE Trans. Quantum Eng.

105

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“…In recent years, non-Hermitian PT-symmetric systems have been discussed in quantum mechanics [20][21][22], optics [23][24][25][26][27], acoustics [28,29], electronics [30,31], and magnonics [32][33][34][35][36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

“…Injecting magnons in different magnetic layers, the magnon profile is then not reciprocally switched. [37] In the vicinity of the EP, the magnon excitation efficiency and the response to external disturbance are substantially enhanced. [37,38,46] Above the EP, an abrupt spin reversal is observed.…”

Section: Introductionmentioning

confidence: 99%

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Magnon Dynamics in Parity-Time-Symmetric Dipolarly Coupled Waveguides and Magnonic Crystals

et al. 2022

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We consider the magnonic properties of two dipolarly coupled magnetic stripes, both deposited on a normal conductive substrate with strong spin-orbit coupling. A charge current in the substrate acts on the adjacent magnets with spin-orbit torques, which result in magnonic damping or antidamping of the spin waves, and hence a gain-loss coupling of the two magnetic stripes. The whole setup is demonstrated to exhibit features typical for parity-time (PT) symmetric systems.Phenomena are demonstrated that can be functionalized in magnonic devices, including reconfigurable magnonic diodes and logic devices. Alternative stripes designs and PT-symmetric, periodic, coupled magnonic textures are studied. Analytical and full numerical analysis identify the conditions for the appearance of exceptional points (EPs), where magnonic gain and loss are balanced and evidence nonreciprocal magnon propagation and enhanced magnon excitation around EPs. Furthermore, the dipolar coupling is shown to bring in a wave vector-dependent PT-symmetric behavior. Proposing and simulating a PT-symmetric magnonic crystal, we show how EPs and hence associated phenomena can be steered to a particular wave vector in a gaped spectrum via material design. The phenomena offer additional tools for magnonic-based communication and computational devices.

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“…[PT , H] = 0. Since then, many studies has been done in this area with potential applications in optics and other areas of physics such as open quantum systems, supersymmetric quantum mechanics, topological matter, cold atoms and magnonics waveguides [2,3,4,5,6,7,8,9,10,11,12,15,16,17,18,19,13,14,20,21,22,23,24] .…”

Section: Introductionmentioning

confidence: 99%

Integral Transforms and $\mathcal{PT}$-symmetric Hamiltonians

AlMasri¹,

Wahiddin²

2022

Preprint

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The exponential Fourier transform of a given non-Hermitian PT -symmetric potential in the position space is Hermitian . We prove this proposition for any PT -symmetric non-Hermitian Hamiltonians. The hermiticity of the Fourier transform of non-Hermitian Hamiltonian operator can be used as a condition for the reality of energy spectra in the unbroken PT -symmetric regime . In the broken PT -symmetric regime, pairs of complex eigenvalues may appear for potentials written in the position space. However, these complex pairs disappear in the momentum space and we are left only with real eigenvalues. Finally, we test our proposition in the case of Swanson Hamiltonian.

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Steering magnonic dynamics and permeability at exceptional points in a parity–time symmetric waveguide

Cited by 34 publications

References 60 publications

Quantum Engineering With Hybrid Magnonic Systems and Materials (Invited Paper)

Quantum Engineering With Hybrid Magnonic Systems and Materials (Invited Paper)

Magnon Dynamics in Parity-Time-Symmetric Dipolarly Coupled Waveguides and Magnonic Crystals

Integral Transforms and $\mathcal{PT}$-symmetric Hamiltonians

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