A5103004161- Semiconductor Quantum Structures and Devices
- Semiconductor materials and devices
- Quantum and electron transport phenomena
- Advancements in Semiconductor Devices and Circuit Design
- Semiconductor Lasers and Optical Devices
- Graphene research and applications
- Photonic and Optical Devices
- Advanced Semiconductor Detectors and Materials
- Quantum Dots Synthesis And Properties
- Physics of Superconductivity and Magnetism
- Semiconductor materials and interfaces
- Carbon Nanotubes in Composites
- GaN-based semiconductor devices and materials
- Nanowire Synthesis and Applications
- Molecular Junctions and Nanostructures
- Integrated Circuits and Semiconductor Failure Analysis
- Advancements in Battery Materials
- Electronic and Structural Properties of Oxides
- Radio Frequency Integrated Circuit Design
- Diamond and Carbon-based Materials Research
- Neonatal Health and Biochemistry
- Silicon Nanostructures and Photoluminescence
- Renal Transplantation Outcomes and Treatments
- Epoxy Resin Curing Processes
- Surface and Thin Film Phenomena
Kobe University
2013-2025
Boston Dynamics (United States)
2024
Beppu Medical Center
2024
Georgia Institute of Technology
2021-2024
Akashi Medical Center
2015-2024
Tokyo University of Agriculture and Technology
2023
Osaka University
1973-2022
Ukrainian Catholic University
2022
Nippon Steel (Japan)
2021
Aichi Institute of Technology
2021
Abstract-A new functional, resonant-tunneling hot electron transistor (RHET) is demonstrated in which electrons are injected from emitter to base by through a quantum well, and near-ballistically transferred collector. The main feature of this device peaked collector-current characteristic with respect the base-emitter voltage. This enables us build frequency multiplier or an Exclusive-NOR gate using only one transistor.
The reasons for the relatively low transport mobility of graphene grown through chemical vapor deposition (CVD-G), which include point defect, surface contamination, and line were analyzed in current study. A series control experiments demonstrated that determinant factor CVD-G did not arise from defects or contaminations, but stemmed induced by grain boundaries. Electron microscopies characterized presence boundaries indicated polycrystalline nature CVD-G. Field-effect transistors based on...
The therapeutic potential of mesenchymal stem cells (MSCs) may be attributed partly to humoral factors such as growth factors, cytokines, and chemokines. Human term placental tissue-derived MSCs (PlaMSCs), or conditioned medium left over from cultures these cells, have been reported enhance angiogenesis. Recently, the exosome, which can transport a diverse suite macromolecules, has gained attention novel intercellular communication tool. However, role exosome in PlaMSC action is not well...
We investigated the current-voltage characteristics of double barrier, resonant tunneling structure, using a self-consistent method. note significance effects band bending and buildup space charge in quantum well. For peak current, our calculated results agree with measured very However, valley current is much greater than values.
Periodontal disease is one of the most common infectious diseases in adults and characterized by destruction tooth-supporting tissues. Mesenchymal stem cells (MSCs) comprise mesoderm-originating cell population, which has been studied used for therapy. However, because lower rate survival after MSC transplantation various models, paracrine functions MSCs have receiving increased attention as a regenerative mechanism. The aim this study was to investigate potential transplanted conditioned...
Abstract Background This study aimed to investigate the association between Fc-gamma receptor IIIA (FCGR3A) 158 polymorphism and clinical outcomes in kidney transplantation (KTx) patients. Specifically, we focused on late-onset neutropenia (LON) ABO-incompatible (ABOi) or HLA-incompatible (HLAi) KTx recipients who underwent rituximab (RTx) desensitization therapy. Methods FCGR3A 158F/V polymorphisms were identified 85 ABOi HLAi RTx at our institution April 2008 October 2021. We analyzed...
We demonstrate the first 1.3-μm continuous-wave (CW) lasing at room temperature of self-assembled InGaAs-GaAs quantum dots. High-density emission dots were successfully formed by combination low-rate growth and InGaAs-layer overgrowth methods molecular beam epitaxy. The ground-level CW occurred up to 40/spl deg/C, threshold current 8 mA 25/spl deg/C is less than one thirtieth values ever reported for dot pulse lasers. achievement represents a milestone creating quantum-dot lasers applicable...
We report on the dynamic control over orientation of short oligonucleotide strands which are tethered to gold surfaces in electrolyte solution. By applying alternating electrical bias potentials supporting electrodes we able induce a switching layer conformation between "lying" and "standing" state, simultaneously monitored contactless mode by fluorescence techniques. demonstrate that our electrooptical experiments allow for an in-depth investigation intriguing molecular dynamics DNA at and,...
We report the numerical analysis of our experimental results for electron-wave propagation from a quantum point contact to wire. Our method solves boundary problem lattice model, and determines wave functions at an arbitrary site. This also includes recursive Green's-function method. study found oscillations in conductance, magnetic suppression those oscillations. For simple we simulate directly related channel number To understand suppression, investigate dependence on field using realistic...
We have developed an excellent fabrication method for a Si single-electron field effect transistor memory device having self-aligned floating dot gate. This demonstrates single electron operation at room temperature. The ability to precisely control the size and position of gate channel indicates feasibility practical memory.
We propose a new optical memory structure using self-assembled InAs quantum dots (QDs) for possible applications to wavelength-domain-multiplication memory, which should lead increase density. Data stored in this can be read photocurrent and then erased electrically. In preliminary study, we confirmed the effect of caused by QDs first time. A retention time 0.48 ms was obtained at 300 K.
We first succeeded in generating single-photon pulses the C-band (1.55-µm band: highest transmittance optical telecommunication bands) from a single InAs/InP quantum dot. The dot with 1546.1-nm exciton emission was prepared by controlling growth conditions. A well-designed mesa structure presented efficient injection of emitted photons into single-mode fiber. Hanbury-Brown and Twiss measurement has proved that through fiber were photons. also performed to transmit 30-km This preliminary...
We report a method to detect label-free oligonucleotide targets. The conformation of surface-tethered probe nucleic acids is modulated by alternating electric fields, which cause the molecules extend away from or fold onto biased surface. Binding (hybridization) targets single-stranded probes results in pronounced enhancement layer-height modulation amplitude, monitored optically real time. features an exceptional detection limit <3 x 10(8) bound per cm(2) sensor area. Single base-pair...
Thickness-controlled growth of few-layer and multi-layer graphene was performed at 650 °C by thermal chemical vapor deposition, top-gated field effect transistors (FETs) were fabricated directly on a large SiO2/Si substrate without graphene-transfer processes. Graphene synthesized patterned Fe films. The iron subsequently etched after both ends the fixed source drain electrodes, leaving channels bridging electrodes all over substrate. Top-gated FETs then made covering with HfO2. devices...
We propose and experimentally demonstrate a functional electron device, which is polarity-controllable inverter constructed using four-terminal ambipolar graphene field effect transistor (FET). The FET has two input terminals, both top gate back gate, the polarity of can be switched by switching to gate. slope transfer curves changed changing back-gate voltage. By adding binary digital data sinusoidal carrier waves into inverter, respectively, one-transistor phase modulator operated.
We succeeded in efficiently generating single-photon pulses from an InAs/InP quantum dot at a wavelength of 1.5 μm. Our optical structure, named single photon horn, can propagate over 95% InP substrate. extracted the through anti-reflection coating on substrate, and then we injected them into objective lens. Total extraction efficiency to lens reached ∼11%, which was estimated using correlation measurement. Furthermore directly observed pulse width ∼1.6 ns as exciton lifetime dot, opens up...
The conduction properties of graphene were tuned by tailoring the lattice using an accelerated helium ion beam to embed low-density defects in lattice. density embedded was estimated be 2-3 orders magnitude lower than that carbon atoms, and they functionalized a sheet more stable manner chemical surface modifications can do. Current modulation through back gate biasing demonstrated at room temperature with current on-off ratio 2 magnitude, activation energy thermally activated transport...
Periodontal ligament (PDL) contributes to maintaining homeostasis in periodontal tissues by supplying stem/progenitor cells. It has long been suggested that PDL stem cells/progenitors are located around blood vessels. Recently mesenchymal cells (MSCs) have isolated and cultured from vitro, although the location of is unclear. The purpose this study test characteristics human (PDLSCs) examine their similarity related vascular cell types, such as pericytes endothelial cells.PDLSCs were...
Periodontal disease is characterized by the destruction of tooth supporting tissues. Regeneration periodontal tissues using ex vivo expanded cells has been introduced and studied, although appropriate methodology not yet established. We developed a novel cell transplant method for regeneration ligament stem (PDLSC)-transferred amniotic membrane (PDLSC-amnion). The aim this study was to investigate regenerative potential PDLSC-amnion in rat defect model. Cultured PDLSCs were transferred onto...
The excess mortality of coronavirus disease 2019 (COVID-19) solid organ transplant recipients (SOTRs) throughout the pandemic remains unclear. This prospective cohort study based on Japanese nationwide registry included 1632 SOTRs diagnosed with COVID-19 between February 1, 2020, and July 31, 2022, categorized dominant phases variants concern (VOCs): Waves 1 to 3 (Beta), 4 (Alpha), 5 (Delta), 6 (Omicron BA.1/BA.2), 7 BA.5). Excess COVID-19-affected was analyzed by calculating standardized...
This paper presents the lasing properties and their temperature dependence for 1.3-/spl mu/m semiconductor lasers involving self-assembled InGaAs-GaAs quantum dots as active region. High-density emission were successfully grown by combination of low-rate growth InGaAs-layer overgrowth using molecular beam epitaxy. ground-level CW occurring at a low threshold current 5.4 mA 25/spl deg/C with realistic cavity length 300 /spl high-reflectivity coatings on both facets. The internal loss was...
Room temperature CW operation at the ground state has been achieved in self-formed quantum dot lasers with a multi-stacked layer. By systematic investigation, discontinuous shifts of lasing wavelength from high-order sub-bands to are clearly demonstrated by varying number layers and cavity loss.
Temperature dependence of self-formed quantum dot lasers with a multi-stacked layer has been investigated in detail. Lasers oscillating at different subbands exhibit behaviors against temperature change both the spectral characteristics and threshold current. A discontinuous shift lasing wavelength from second subband to ground state is observed lowering temperature, which strongly related emission efficiency dots thermal excitation carriers higher-order subbands. High characteristic over...