A5015885805- Dark Matter and Cosmic Phenomena
- Welding Techniques and Residual Stresses
- Atomic and Subatomic Physics Research
- Advanced Welding Techniques Analysis
- Cold Atom Physics and Bose-Einstein Condensates
- Semiconductor Quantum Structures and Devices
- Fatigue and fracture mechanics
- Metallurgy and Material Forming
- Laser and Thermal Forming Techniques
- Aluminum Alloy Microstructure Properties
- Semiconductor materials and devices
- Intermetallics and Advanced Alloy Properties
- Magnetic Properties and Applications
- Metal Forming Simulation Techniques
- Magnetic properties of thin films
- Cosmology and Gravitation Theories
- Metal and Thin Film Mechanics
- Semiconductor materials and interfaces
- Organic Light-Emitting Diodes Research
- Galaxies: Formation, Evolution, Phenomena
- Magnetism in coordination complexes
- Particle Detector Development and Performance
- Organic and Molecular Conductors Research
- Pulsars and Gravitational Waves Research
- Advanced battery technologies research
The University of Tokyo
2021-2024
Kansai University
2015
Osaka University
1990-2009
Kyoto University
1994-1998
Toshiba (Japan)
1997
Kobe University
1978
Axions are one of the well-motivated candidates for dark matter, originally proposed to solve strong $CP$ problem in particle physics. Dark matter Axion search with riNg Cavity Experiment (DANCE) is a new experimental project broadly axion mass range ${10}^{\ensuremath{-}17}\text{ }\text{ }\mathrm{eV}<\phantom{\rule{0ex}{0ex}}{m}_{a}<{10}^{\ensuremath{-}11}\text{ }\mathrm{eV}$. We aim detect rotational oscillation linearly polarized light caused by axion-photon coupling bow-tie cavity. The...
The surface morphology and crystalline quality of GaN layers grown by metalorganic chemical vapor deposition on sapphire (0001) substrates were investigated for various thermal treatment conditions low-temperature (LT)-grown buffer layers. subsequently high-temperature (HT) strongly depended effects during the temperature ramping process after LT growth We have found that defect density structure are affected this process, generation pits is closely related to defects in HT-GaN High-quality...
We have proposed using laser interferometric gravitational wave detectors to search for ultralight vector and axion dark matter. Vector matter can be probed through oscillating forces on suspended mirrors, while detected via polarization rotation of beams. This paper reviews these searches with the KAGRA detector in Japan, including first KAGRA's 2020 data installation optics during upcoming 2025 observing run.
Abstract A 20‐inch, largest OLED display in the world is demonstrated which driven by “Super Amorphous Silicon” technology. It has been widely believed that characteristics of amorphous silicon TFT not sufficient to drive display. This paper turns over hypothesis prove can be applied large active‐matrix displays. Novel approaches enable bright and long life are shown open a future realize larger televisions.
Angular dependent magnetoresistance oscillation (ADMRO) effect in α-(BEDT-TTF) 2 MHg(SCN) 4 [M: K, NH ] has been studied as a function of the polar and azimuthal angles applied magnetic field with respect to most conducting c -plane. The ADMRO effects these two structurally similar compounds are drastically different their angle dependence waveform. While Hg-salt is standard type arising from warped cylindrical Fermi surface, that KHg-salt novel be attributed an open sheet. Calculation based...
Photoreflectance and photoluminescence measurements are carried out in (GaAs${)}_{\mathit{n}}$/(AlAs${)}_{\mathit{n}}$ superlattices with n ranged from 1 to 15 at room temperature. Analysis of photoreflectance spectra gives several critical-point energies a high accuracy which coincide the peak n\ensuremath{\ge}10. In n10 lowest transition energy determined analysis is found be larger than photoluminescence, whereas higher-energy agrees well obtained analysis. The present results strongly...
Dark matter Axion search with riNg Cavity Experiment (DANCE) was proposed. To for axion-like particles, we aim to detect the rotation and oscillation of optical linear polarization caused by axion-photon coupling a bow-tie cavity. DANCE can improve sensitivity constant $g_{a γ}$ axion mass $m_a < 10^{-10} \, \rm{eV}$ several orders magnitude compared best upper limits at present. A prototype experiment Act-1 is in progress demonstrate feasibility method investigate technical noises. We...
The thermal stabilizing effect of sugar on freeze-dried protein is studied, in particular the relationship between and degree sugar-protein hydrogen bond formation. Sucrose lactate dehydrogenase (LDH) are used as models for protein. Several samples LDH involved sucrose were prepared; they differed crystallinity sucrose. By X-ray diffractometry (XRD) Fourier transform infrared (FT-IR) spectroscopy, it found that when amorphous samples, formation high stabilized remarkably. In contrast,...
Abstract Axion-like particles (ALPs) are undiscovered pseudo-scalar that candidates for ultralight dark matter. ALPs interact with photons slightly and cause the rotational oscillation of linearly polarized light. Dark matter Axion search riNg Cavity Experiment (DANCE) searches ALP by amplifying a bow-tie ring cavity. Simultaneous resonance linear polarizations is necessary to amplify both carrier field signal, achieve design sensitivity. The sensitivity current prototype experiment DANCE...
We have studied the effect of dot separation on switching behavior Ni-Fe elliptical arrays with major axial distances between adjacent dots. The magnetization process and magnetic configuration in apparently differ according to distance These differences are due fact that dipole-dipole interaction becomes stronger while decreasing From these results, it is evident optimal at which dots couples by below 30 nm.
Abstract Dark matter Axion search with riNg Cavity Experiment (DANCE) was proposed to for axion dark [ Phys. Rev. Lett . 121, 161301 (2018)]. We aim detect the rotation and oscillation of optical linear polarization caused by axion-photon coupling a bow-tie cavity. DANCE can improve sensitivity constant g γ mass m < 10 −10 eV several orders magnitude compared best upper limits at present. A prototype experiment Act-1 is ongoing demonstrate feasibility method investigate technical noises....
Axion-like particles (ALPs) are pseudo-scalar that candidates for ultralight dark matter. ALPs interact with photons slightly and cause the rotational oscillation of linear polarization. DANCE searches ALP matter by enhancing in a bow-tie ring cavity. The signal to noise ratio can be improved long-term observation, we planning year-long observation final DANCE. In this document, I will report on control systems cavity developed future observation.
Optomechanical systems have attracted intensive attention in various physical experiments. With an optomechanical system, the displacement of or force acting on a mechanical oscillator can be precisely measured by utilizing optical interferometry. As oscillator, suspended mirror is often used over milligram scale systems. However, tiny linear cavity unstable its yaw rotational degree freedom due to radiation pressure. This instability curbs power that accumulate it and imposes limitation...
Axions are one of the well-motivated candidates for dark matter, originally proposed to solve strong CP problem in particle physics. Dark matter Axion search with riNg Cavity Experiment (DANCE) is a new experimental project broadly axion mass range $10^{-17}~\mathrm{eV} < m_a 10^{-11}~\mathrm{eV}$. We aim detect rotational oscillation linearly polarized light caused by axion-photon coupling bow-tie cavity. The first results prototype experiment, DANCE Act-1, reported from 24-hour...
We have investigated the detailed magnetization reversal in 10-nm-thick Ni-Fe elliptical dots with several dot sizes using magnetic field sweeping (MFS)-magnetic force microscopy (MFM). At edges, shape of phase (the stray field) curve versus changes from a stepped hysteresis loop to almost nonstepped increasing size. On other hand, at center within dot, sharp or weak decreases are observed as is varied. From these results, it found that, sizes, dominant factor change domain configuration...