Daiki Hatanaka
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View article: Imaging valley-vortex edge modes in a phononic crystal at ultrahigh frequencies
Imaging valley-vortex edge modes in a phononic crystal at ultrahigh frequencies Open
We perform optical measurements and numerical simulations of guided phonon propagation in novel topological phononic crystal structures at ultrahigh frequencies. The structures support valley-polarized states that exhibit an energy vortex …
View article: Magnon-phonon coupling of synthetic antiferromagnets in a surface acoustic wave cavity resonator
Magnon-phonon coupling of synthetic antiferromagnets in a surface acoustic wave cavity resonator Open
We use a surface acoustic wave (SAW) cavity resonator to study the coupling of acoustic magnons in a synthetic antiferromagnet (SAF) and the phonons carried by SAWs. The SAF is composed of a CoFeB/Ru/CoFeB trilayer and the scattering matri…
View article: Quadrature skyrmions in two-dimensionally arrayed parametric resonators
Quadrature skyrmions in two-dimensionally arrayed parametric resonators Open
Skyrmions are topological solitons in two-dimensional systems and have been observed in various physical systems. Generating and controlling skyrmions in artificial resonator arrays lead to novel acoustic, photonic, and electric devices, b…
View article: Evanescently coupled topological ring-waveguide systems for chip-scale ultrahigh frequency phononic circuits
Evanescently coupled topological ring-waveguide systems for chip-scale ultrahigh frequency phononic circuits Open
Topological phononics enabling backscattering-immune transport is expected to improve the performance of electromechanical systems for classical and quantum information technologies. Nonetheless, most of the previous demonstrations utilize…
View article: Cavity magnomechanical coupling with coupled magnon modes in a synthetic antiferromagnet
Cavity magnomechanical coupling with coupled magnon modes in a synthetic antiferromagnet Open
On-chip cavity magnomechanics is an emerging field exploring acoustic and magnonic functionalities of various ferromagnetic materials and structures using strongly confined phonons. It is expected that such cavity magnomechanics can be ext…
View article: Quadrature skyrmions in two-dimensionally arrayed parametric resonators
Quadrature skyrmions in two-dimensionally arrayed parametric resonators Open
Skyrmions are topological solitons in two-dimensional systems and have been observed in various physical systems. Generating and controlling skyrmions in artificial resonator arrays lead to novel acoustic, photonic, and electric devices, b…
View article: Impedance-matched High-overtone Bulk Acoustic Resonator
Impedance-matched High-overtone Bulk Acoustic Resonator Open
A high-overtone bulk acoustic resonator (HBAR), in which a piezoelectric transducer is set on an acoustic cavity, has been attracting attention in both fundamental research and RF applications due to its scalability, high frequency, and hi…
View article: Phononic-crystal cavity magnomechanics
Phononic-crystal cavity magnomechanics Open
Establishing a way to control magnetic dynamics and elementary excitations (magnons) is crucial to fundamental physics and the search for novel phenomena and functions in magnetic solid-state systems. Electromagnetic waves have been develo…
View article: Buckling-induced quadratic nonlinearity in silicon phonon waveguide structures
Buckling-induced quadratic nonlinearity in silicon phonon waveguide structures Open
We fabricated and characterized a single-crystal silicon phonon waveguide structure with lead zirconate titanate (PZT) piezoelectric transducers. The compressive stress in a silicon-on-insulator wafer causes a membrane waveguide to buckle,…
View article: Buckling-induced quadratic nonlinearity in silicon phonon waveguide structures
Buckling-induced quadratic nonlinearity in silicon phonon waveguide structures Open
We fabricated and characterized a single-crystal silicon phonon waveguide structure with lead zirconate titanate (PZT) piezoelectric transducers. The compressive stress in a silicon-on-insulator wafer causes a membrane waveguide to buckle,…
View article: Mode-sensitive magnetoelastic coupling in phononic-crystal magnomechanics
Mode-sensitive magnetoelastic coupling in phononic-crystal magnomechanics Open
The acoustically driven spin-wave resonance in a phononic-crystal cavity is numerically investigated. The designed cavity enables confinement of gigahertz vibrations in a wavelength-scale point-defect structure and sustains a variety of re…
View article: Modal Analysis Investigation of Mechanical Kerr Frequency Combs
Modal Analysis Investigation of Mechanical Kerr Frequency Combs Open
The aim of this work is to theoretically investigate the possibility of Kerr frequency combs in mechanical systems. In particular, whether microelectrome-chanical devices (MEMS) can be used to generate frequency combs in a manner that is a…
View article: Electrostatically Induced Phononic Crystal
Electrostatically Induced Phononic Crystal Open
The possibility of realizing an electrostatically induced phononic crystal is\ninvestigated numerically in an acoustic waveguide based on a graphene sheet\nthat is suspended over periodically arrayed electrodes. The application of dc\nvolt…
View article: Limit cycles and bifurcations in a nonlinear MEMS oscillator with a 1:3 internal resonance. Part I: The case of a driven resonator
Limit cycles and bifurcations in a nonlinear MEMS oscillator with a 1:3 internal resonance. Part I: The case of a driven resonator Open
This work investigates the behavior of an AlGaAs/GaAs piezoelectric nonlinear MEMS oscillator exhibiting a 1:3 internal resonance. The device is explored in an open-loop configuration, i.e. as a driven resonator, where depending on the dri…
View article: On-chip phononic time lens
On-chip phononic time lens Open
The ability to manipulate phonon waveforms in continuous media has attracted significant research interest and is crucial for practical applications ranging from biological imaging to material characterization. Although several spatial foc…
View article: A correlated electromechanical system
A correlated electromechanical system Open
A correlation with phonons sustained by a pair of electromechanical resonators that differ both in size and frequency is demonstrated. In spite of the electromechanical resonators being spatially distinct, they can still be strongly dynami…