A5067838223- Force Microscopy Techniques and Applications
- Molecular Junctions and Nanostructures
- Surface and Thin Film Phenomena
- Semiconductor Quantum Structures and Devices
- Organic and Molecular Conductors Research
- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Advanced Chemical Physics Studies
- Semiconductor materials and interfaces
- 2D Materials and Applications
- Surface Chemistry and Catalysis
- Electron and X-Ray Spectroscopy Techniques
- Integrated Circuits and Semiconductor Failure Analysis
- Quantum and electron transport phenomena
- Mechanical and Optical Resonators
- Semiconductor materials and devices
- Advanced Materials Characterization Techniques
- Spectroscopy and Quantum Chemical Studies
- Chalcogenide Semiconductor Thin Films
- Advanced Electron Microscopy Techniques and Applications
- Graphene research and applications
- Near-Field Optical Microscopy
- Terahertz technology and applications
- Nanowire Synthesis and Applications
- Photonic Crystal and Fiber Optics
University of Tsukuba
2015-2024
Applied Science University
2022
National Institute for Materials Science
2019
Abcam (United States)
2010
Centre for Research in Engineering Surface Technology
1999-2007
Centre de Recherche en Économie et Statistique
2007
Institut Supérieur de l'Électronique et du Numérique
2007
Nagoya University
2007
NTT Basic Research Laboratories
2007
Centre National de la Recherche Scientifique
2007
A few years ago, the remarkable catalytic activity of lanthanide ions for hydrolysis nucleic acids was discovered. With CeIV, DNA hydrolysed under physiological conditions. For RNA hydrolysis, last three (TmIII, YbIII, and LuIII) are superb. Furthermore, artificial restriction enzymes site-selective scission RNA, essential tools future biotechnology, have been prepared by using complexes. The present article emphasizes mechanistic aspects catalyses these metal ions. Both involve cooperation...
Studying the microscopic behavior of free carriers in materials at an ultrashort time scale is critical to developing semiconductor, optoelectronic, and other technologies satisfying ever-increasing requirements for smaller sizes higher speeds. Understanding effect local potential modulations localized states due nanoscale microstructures on carrier dynamics essential realize these requirements. Here, we used time-resolved scanning tunneling microscopy/spectroscopy (STM/STS) combined with a...
Variations in molecular electronic structures related to conformational change are exceedingly attractive because of their key role the understanding and development functional processes electronics biology. We observed, for first time, novel phase switching a photoactive isomeric molecule, N-(2-mercaptoethyl)-4-phenylazobenzamide (Azo molecule) at single-molecule level, which exhibits distinctive conductive characteristic under scanning tunneling microscope (STM) measurement. In comparison...
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTThe Molecular Abacus: STM Manipulation of Cyclodextrin NecklaceHidemi Shigekawa, Koji Miyake, Jun Sumaoka, Akira Harada, and Makoto KomiyamaView Author Information Institute Applied Physics CREST Japan Science Technology Corporation (JST) University Tsukuba, Ibaraki 305-8573, Department Chemistry Biotechnology Research Center for Advanced The Tokyo, Komaba, Tokyo 153-8904, Chemistry, Graduate School Osaka University, Toyonaka, Osaka,...
By means of scanning tunneling microscopy (STM), we succeeded for the first time in quantitative analysis intramolecular conformation a supramolecule, cyclodextrin (CyD) necklace, driven by hydrogen bonding. Contrary to current model, based on macroscopic analyses, which indicates that all CyDs are arranged head-to-head or tail-to-tail (secondary-secondary primary-primary bonding) conformation, about 20% head-to-tail (primary-secondary was found exist molecule. In addition, comparing STM...
The chemistry of the (NH4)2Sx-treated n-GaAs (100) surfaces has been studied using synchrotron radiation photoemission spectroscopy. Ga 3d, As and S 2p spectra are measured before after annealing in vacuum with a photon energy about 210 eV, where core level can be sensitively detected. It is found that Ga-S, As-S, S-S bonds formed on as-treated GaAs surfaces, stable Ga-S become dominant at 360 °C for 10 min vacuum. thickness surface sulfide layer reduced from 0.5 to 0.3 nm by annealing....
Inelastically tunneled electrons from a scanning tunneling microscope (STM) were used to induce vibrationally mediated motion of single cis-2-butene molecule among four equivalent orientations on Pd(110) at 4.8 K. The action spectrum obtained the clearly detects more vibrational modes than inelastic electron spectroscopy with STM. We demonstrate usefulness as novel spectroscopic method. also discuss its selection rules in terms resonance tunneling.
The recent development of optical technology has enabled the practical use a carrier-envelope phase-controlled monocycle electric field in terahertz (THz) regime. By combining this technique with metal nanostructures such as nanotips, which induce near-field enhancement, novel applications is anticipated. In particular, THz scanning tunneling microscopy (THz-STM) promising for probing ultrafast dynamics spatial resolution STM. However, modulation waveform generally accompanied by an...
Conductance was measured for the single molecules with S/Se anchoring on a Au surface using point contact method scanning tunneling microscopy that enables us to selectively perform repeated analysis of chosen target molecule. Apparent conductance changes observed in sequential measurements suggest existence bond fluctuation among adsorption sites.
Abstract Transition-metal dichalcogenide layered materials, consisting of a transition-metal atomic layer sandwiched by two chalcogen layers, have been attracting considerable attention because their desirable physical properties for semiconductor devices and wide variety pn junctions, which are essential building blocks electronic optoelectronic devices, realized using these atomically thin structures. Engineering the electronic/optical semiconductors such heterojunctions has central...
The in-plane connection and layer-by-layer stacking of atomically thin layered materials are expected to allow the fabrication two-dimensional (2D) heterostructures with exotic physical properties future engineering applications. However, it is currently necessary develop a continuous growth process that allows assembly wide variety atomic layers without interface degradation, contamination, and/or alloying. Herein, we report heteroepitaxial 2D multiheterostructures nanoribbons based on...
We demonstrate the successful fabrication of an almost defect free Si(001) surface by refining standard annealing and flashing preparation method. On any desired samples, we can routinely fabricate a with densities lower than 0.1%, significantly reducing density compared to surfaces fabricated methodology.
Wave-propagation equations, including effectively the second derivative in time under condition of a small difference between group and phase velocities first position /spl xi/ velocity coordinate, are derived based on slowly evolving wave approximation. These can describe ultrabroadband optical pulse propagation with not only self-phase modulation (SPM), but also induced-phase (IPM) monocycle regime fiber. It is shown that linear dispersion effects be rigorously included numerical...
The dynamics of the flip-flop motion single buckled dimers Si(100) was elucidated by locating tip a scanning tunneling microscope over flip-flopping dimer and measuring current (time trace). Based on statistical analysis time trace, we succeeded in estimating activation energy splitting between two stable configurations buckling. Strong dependence local environment found: Activation differs significantly (directly measured 32 meV, estimated approximately 110 meV) for different domains.
Abstract Semiconductor heterojunction interfaces have been an important topic, both in modern solid state physics and electronics optoelectronics applications. Recently, the heterojunctions of atomically-thin transition metal dichalcogenides (TMDCs) are expected to realize one-dimensional (1D) electronic systems at their heterointerfaces due tunable properties. Herein, we report unique conductivity enhancement electrical potential modulation based on TMDC bilayers consisted MoS 2 WS ....
Electric-field-driven scanning tunneling microscopy (STM) that uses carrier envelope phase-controlled pulses in the THz region (THz-STM) has been attracting considerable attention because of its capability probing ultrafast dynamics materials. However, since electric field is region, time resolution about 1 ps limits range measurable targets. Therefore, to pave way for studying local non-equilibrium states such as elementary excitations and phase transitions condensed materials, it desirable...
We have investigated the basic surface reconstruction of Si(100) on well defined surfaces fabricated various substrates at low temperatures (-80 K) by scanning tunneling microscopy. Below 40 K, single p(2x2) phase, a phase never observed before, was exclusively n-type doped in range 0.002 to 0.017 Omega cm. also exclude possibility (2x1) symmetric dimer commonly temperature (-10 being showing that buckled can be flip-flopped tip.
We have developed a simple and straightforward way to realize controlled postdoping toward 2D transition metal dichalcogenides (TMDs). The key idea is use low-kinetic-energy dopant beams high-flux chalcogen beam simultaneously, leading substitutional doping with densities. Atomic-resolution transmission electron microscopy has revealed that atoms injected TMDs are incorporated substitutionally into the hexagonal framework of TMDs. electronic properties doped (Nb-doped WSe2) shown drastic...
We revisit and refine the interpretation of scanning tunneling microscopy (STM) images Si(100) dimers, based on results from an extensive set STM observations carried out at low temperature (80 K) total-energy calculations surfaces. The addresses some unresolved questions brings much experimental theoretical research into unanimous agreement. show that surface resonances bulk states seriously contributes to within usual conditions. In empty state, these overwhelms localized...