Exceptional-Point Phase Transition in Coupled Magnonic Waveguides

Sadovnikov, А. V.; Zyablovsky, A. A.; Dorofeenko, A. V.; Никитов, С. А.

doi:10.1103/physrevapplied.18.024073

Cited by 22 publications

(9 citation statements)

References 51 publications

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“…As one of the observed spatial characteristics, the spin-wave coupling length in the lateral stripes of YIG separated with the air gap can be noted [47]. The variation of the coupling length observed with Brillouin spectroscopy could serve as experimental validation of the spin-wave spectra transformation in the lateral YIG stripes with a GaAs layer [30]. Lateral structures were combined as bilayers, and spin-wave propagation was tuned via the variation of laser power focused on the surface of the GaAs layer.…”

Section: Introductionmentioning

confidence: 87%

“…The pioneering works focused on such bilayers that appeared decades ago and described the SW spectra modification by the appearance of the semiconductor layer and/or by the light irradiation of this layer, and the variation of SW damping induced by the current flow in the semiconductor layer [21][22][23][24][25][26][27][28][29][30]. We note here that these works showed a lightinduced modification of the dispersion and spectra of SWs in semiconductor-ferromagnetic bilayers, and proved that this tuning is related to the change in optically injected charge carriers in the semiconductor layer.…”

Section: Introductionmentioning

confidence: 99%

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Lateral semiconductor magnonics: an array of GaAs stripes atop the YIG layer

Martyshkin,

Bublikov,

Beginin

et al. 2024

J. Phys. D: Appl. Phys.

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In this work, we demonstrate the numerical and experimental research of the spin wave transport in the structure composed of the gallium arsenide (GaAs) stripes lattice interfaced to the yttrium iron garnet layer. We show that this structure can be considered as an array of an infinite number of laterally coupled ferrite-semiconductor waveguides.We present, that the surface wave properties for the case of colinear propagation along the semiconductor stripes are similar to the waves in magnetic films with partial metallization. In addition, the properties of these surface waves depend on the electron concentration of the GaAs and thus may be tuned. In the case of the wave propagation at some angle to the GaAs stripes lattice, the Bragg resonance forms, and the corresponding band gap depends on the angle between the wave to the stripes and on the GaAs electron density.Brillouin light scattering technique was used to experimentally observe the spin-wave beam transformation and microwave measurements support the numerical data and reveal the mechanism of the dip formation and widening of the frequency range in the spin-wave transmission. The proposed structure could be used as the reconfigurable metasurface and magnonic beam separation unit.

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Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Lateral semiconductor magnonics: an array of GaAs stripes atop the YIG layer

Martyshkin,

Bublikov,

Beginin

et al. 2024

J. Phys. D: Appl. Phys.

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“…In 2022, Sadovnikov et al proposed a method to control the spin wave loss in one of the YIG waveguides covered by GaAs semiconductor layer by infrared laser irradiation, as shown in Figure 6. [105] The infrared laser irradiates the GaAs-covered waveguide YIG-S2, which makes the charge carriers in the GaAs semiconductor layer transition from the valence band to the conduction band, [106] increasing the conductance of the semiconductor. [107] This changes the boundary conditions of the interface of YIG-S2, and finally leads to the change of spin wave dispersion and increases the loss in YIG-S2 waveguides.…”

Section: Experimental Research Progress Of Pt-symmetric Magnetic Nano...mentioning

confidence: 99%

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confidence: 99%

Parity‐Time Symmetry in Magnetic Materials and Devices

Zhang,

Xin,

Liu

2023

Adv Elect Materials

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Non‐Hermitian Hamiltonians may still possess real eigenvalues in case of the existence of parity‐time (PT) symmetry. Exceptional points (EPs) occur at the phase transition from real to complex eigenvalues due to PT‐symmetry breaking in the parameter space. Magnonic devices use magnons to carry, transport, and process information, which have the advantages of low energy dissipation, wave‐based computing, and nonlinear data processing. The combination of PT‐symmetry and magnonics may lead to novel physics as well as unprecedented functional device applications. Recently, the research of PT‐symmetry in magnetism has developed rapidly. In this review, the theoretical predictions as well as experimental findings of PT‐symmetry in magnetism are summarized. First, a brief introduction to PT symmetry, EPs, and anti‐PT symmetry is presented. Second, the theoretical and experimental progress of magnonic PT symmetry are summarized. Third, the theoretical predictions of higher‐order EPs and anti‐PT symmetry in magnonic systems are given. Finally, the study concludes by discussing the future challenges and research prospects in magnonic PT‐symmetry, and proposals for experimental observations of magnonic higher‐order EPs and anti‐PT symmetry are suggested.

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“…U(x) = U(−x) and U ′ ′ (x) = −U ′ ′ (−x) . The concept of PT-symmetry has aroused great interest and has been extended by appropriate analogies with various physical systems, namely in optics [13,14] (paper [14] describe electromagnetic waves in PT-symmetric optical structures), electronics [15], acoustics [16,17] and magnetism [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Gap electroacoustic waves in PT-symmetric piezoelectric heterostructure near the exceptional point

Вилков

Byshevski-Konopko

Kalyabin

et al. 2023

J. Phys.: Condens. Matter

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The spectral properties of gap electroacoustic waves in a PT-symmetric structure of piezoelectrics of symmetry class 6mm separated by a gap are theoretically investigated. The spectra were calculated for lead germanate (non-zero transverse piezoactivity) and barium titanate (symmetry class 4mm - zero transverse piezoactivity). It has been established that at a certain level of losses and gain in piezoelectrics, the symmetric and antisymmetric modes intersect. The intersection point determines the singular point of the PT-symmetric structure. Beyond this point, there is a violation of the symmetric and antisymmetric distribution of electric fields in the gap of the slotted structure of two identical piezoelectrics, which is confirmed by the calculation of the electric field profiles. It is shown that the dependence of the amplitude on the frequency at an exceptional point has an extremely narrow resonance peak, which opens up the possibility of creating supersensitive sensors based on PT-symmetric physical structures.

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Exceptional-Point Phase Transition in Coupled Magnonic Waveguides

Cited by 22 publications

References 51 publications

Lateral semiconductor magnonics: an array of GaAs stripes atop the YIG layer

Lateral semiconductor magnonics: an array of GaAs stripes atop the YIG layer

Parity‐Time Symmetry in Magnetic Materials and Devices

Gap electroacoustic waves in PT-symmetric piezoelectric heterostructure near the exceptional point

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