A5058592159- Mechanical and Optical Resonators
- Advanced MEMS and NEMS Technologies
- Semiconductor Quantum Structures and Devices
- Force Microscopy Techniques and Applications
- Semiconductor materials and devices
- Quantum and electron transport phenomena
- Photonic and Optical Devices
- Surface and Thin Film Phenomena
- Acoustic Wave Resonator Technologies
- Nanowire Synthesis and Applications
- Particle physics theoretical and experimental studies
- Graphene research and applications
- Advancements in Semiconductor Devices and Circuit Design
- High-Energy Particle Collisions Research
- Advanced Semiconductor Detectors and Materials
- Electron and X-Ray Spectroscopy Techniques
- Silicon Carbide Semiconductor Technologies
- Physics of Superconductivity and Magnetism
- Diamond and Carbon-based Materials Research
- Acoustic Wave Phenomena Research
- Semiconductor Lasers and Optical Devices
- Copper Interconnects and Reliability
- Quantum Dots Synthesis And Properties
- Carbon Nanotubes in Composites
- Quantum Information and Cryptography
NTT Basic Research Laboratories
2015-2024
Photonics Electronics Technology Research Association
2024
NTT (Japan)
2009-2023
Idemitsu Kosan (Japan)
2018-2023
Kwansei Gakuin University
2006-2023
Tohoku University
2008-2022
Kumamoto University
2021
Yokohama National University
2019-2020
ORCID
2020
Tohoku Institute of Technology
2019
When Ga or Al atoms are evaporated on a clean GaAs surface in an As-free atmosphere, they quite mobile and migrate very rapidly along the even at low temperatures. This characteristic utilized for growing high-quality AlAs layers temperatures by alternately supplying As 4 molecules to substrate. Applying this method, AlAs–GaAs quantum well structures with reasonable photoluminescence characteristics grown 200°C 300°C, respectively.
Surface migration is effectively enhanced by evaporating Ga or Al atoms onto a clean GaAs surface under an As-free low As pressure atmosphere. This characteristic was utilized alternately supplying and/or and A S 4 to the substrate for growing atomically-flat GaAs-AlGaAs heterointerfaces, also high-quality AlGaAs layers at very temperatures. The characteristics of adatoms have been investigated through reflection high-energy electron diffraction measurements. It found that different growth...
Low-energy electron microscopy (LEEM) was used to measure the reflectivity of low-energy electrons from graphitized $\mathrm{SiC}(0001)$. The shows distinct quantized oscillations as a function energy and graphite thickness. Conduction bands in thin films form discrete levels whose wave vectors are normal surface. Resonance incident with these conduction band states enhances transmit through film into $\mathrm{SiC}$ substrate, resulting dips reflectivity. dip positions well explained using...
This paper introduces a new approach to measure the muon magnetic moment anomaly |$a_{\mu} = (g-2)/2$| and electric dipole (EDM) |$d_{\mu}$| at J-PARC facility. The goal of our experiment is |$a_{\mu}$| using an independent method with factor 10 lower momentum, 20 smaller diameter storage-ring solenoid compared previous ongoing |$g-2$| experiments unprecedented quality storage field. Additional significant differences from present experimental include 1000 transverse emittance beam...
Amorphous Al–La–Cu alloys exhibiting a wide supercooled liquid region and high reduced glass transition temperature (Tg⁄Tm) were formed over compositional range from 25 to 85 at% La 0 60%Cu by melt spinning. The span ΔTx (=Tx−Tg) between Tg crystallization (Tx) reaches as large 59 K for Al20La55Cu25. Tg⁄Tm is also 0.68 Al20La55Cu25 the are concluded have glass-forming ability. Tx hardness (Hv) increase with increasing Al Cu contents in 430 575 140 300 tensile strength has similar dependence...
In conventional computers, wiring between transistors is required to enable the execution of Boolean logic functions. This has resulted in processors which billions are physically interconnected, limits integration densities, gives rise huge power consumption and restricts processing speeds. A method eliminate amongst by condensing into a single active element thus highly desirable. Here, we demonstrate novel architecture using only electromechanical parametric resonator multiple channels...
An electromechanical resonator harboring an atomlike spectrum of discrete mechanical vibrations, namely, phonon modes, has been developed. A purely three-mode system becomes available in the atom which energy difference two higher modes is resonant with a long-lived lower mode. Our measurements reveal that even incoherent input into mode results coherent emission exhibits all hallmarks lasing process reminiscent Brillouin lasing.
Abstract Macroscopic realism is the name for a class of modifications to quantum theory that allow macroscopic objects be described in measurement-independent manner, while largely preserving fully mechanical description microscopic world. Objective collapse theories are examples which aim solve measurement problem through modified dynamical laws. Whether such describe nature, however, not known. Here we and implement an experimental protocol capable constraining this class, more noise...
The phonons localized in a mechanical resonator can be electrically manipulated to emulate the Ising Hamiltonian.
Magnons, namely spin waves, are collective excitations in ferromagnets, and their control through coupling with other is a key technology for future hybrid spintronic devices. Although strong has been demonstrated microwave photonic structures, an alternative approach permitting high density integration minimized electromagnetic crosstalk required. Here we report planar cavity magnomechanical system, where the of surface acoustic waves enhances spatial spectral power to thus implement...
Strain relaxation in InAs/GaAs(111)A heteroepitaxy has been studied on the atomic scale by scanning tunneling microscopy. The coalescence of small islands and formation a dislocation network are identified at critical layer thickness (CLT), no three-dimensional growth is observed, even beyond CLT. displacement around threading segments strain fields induced misfit dislocations both identified. measured density indicates that not fully relaxed CLT, but instead gradually relieved with additional InAs.
We used low-energy electron microscopy (LEEM) and scanning tunneling (STM) to investigate domain structures of epitaxial few-layer graphene grown on SiC(0001). Dark-field (DF) LEEM images formed using (10) (01) beams clearly indicate that bilayer consists two types domains, which have threefold symmetry are rotated by $180\ifmmode^\circ\else\textdegree\fi{}$ with respect each other. The DF show clear contrasts at energies where (10)- (01)-beam intensities calculated for bulk graphite largely...
ABSTRACT The impacts of air annealing, light soaking (LS), and heat–light (HLS) on cell performances were investigated for ZnS(O,OH)/Cu(In,Ga)Se 2 (CIGS) thin‐film solar cells. It was found that the HLS post‐treatment, a combination LS annealing at 130 °C, is most effective process improving ZnS(O,OH)/CIGS devices. best yielded total area efficiency 18.4% after post‐treatment. X‐ray photoelectron spectroscopy showed improved performance attributable to decreased S/(S + O) atomic ratio, not...
The effect of surface states originating from defects and capping reagents on Auger recombination in CdS quantum dots (QDs) are investigated by femtosecond transient absorption spectroscopy. Because the strong size-dependent nature defects, size dependence is also conducted to reveal states. lifetime very similar irrespective all regions was proportional D6 (D: QD diameter). This result clearly shows that QDs does not depend interfacial electronic structures one monolayer level.
An electromechanical resonator is developed in which mechanical nonlinearities can be dynamically engineered to emulate the nondegenerate parametric down-conversion interaction. In this configuration, phonons are simultaneously generated pairs two macroscopic vibration modes, resulting amplification of their motion. parallel, two-mode thermal squeezed states also created, exhibit fluctuations below motion constituent modes as well harboring correlations between that become almost perfect...
Electromechanical resonators have emerged as a versatile platform in which detectors with unprecedented sensitivities and quantum mechanics macroscopic context can be developed. These schemes invariably utilise single resonator but increasingly the concept of an array electromechanical is promising wealth new possibilities. In spite this, experimental realisations such arrays remained scarce due to formidable challenges involved their fabrication. variation this approach, we identify 75...
Visual detection/adsorption/extraction of Co<sup>2+</sup>ions from SLIBs through a simple, low-cost mesospongy ion-extractor/sensor/captor as new effective route for e-waste management, is presented.