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Back Cover: Motion Capture and Manipulation of a Single Synthetic Molecular Rotor by Optical Microscopy (Angew. Chem. Int. Ed. 38/2014)

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Angewandte Chemie International Edition 2014年第38期53卷

作者： Dr. Tomohiro Ikeda Takahiro Tsukahara Prof. Ryota Iino Prof. Masayuki Takeuchi Prof. Hiroyuki Noji Department of Applied Chemistry School of Engineering The University of Tokyo Bunkyo-ku Tokyo 113-8656 (Japan) Okazaki Institute for Integrative Bioscience Institute for Molecular Science National Institutes of Natural Sciences Higashiyama Myodaijicho Okazaki Aichi 444-8787 (Japan) Organic Materials Group Polymer Materials Unit National Institute for Materials Science 1-2-1 Sengen Tsukuba Ibaraki 305-0047 (Japan) Core Research for Evolutional Science and Technology (Japan) Science and Technology Agency Sanban-cho Chiyoda-ku Tokyo 102-0075 (Japan)

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Rücktitelbild: Motion Capture and Manipulation of a Single Synthetic Molecular Rotor by Optical Microscopy (Angew. Chem. 38/2014)

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Angewandte Chemie 2014年第38期126卷

作者： Tomohiro Ikeda Takahiro Tsukahara Ryota Iino Masayuki Takeuchi Hiroyuki Noji Department of Applied Chemistry School of Engineering The University of Tokyo Bunkyo‐ku Tokyo 113‐8656 (Japan) Okazaki Institute for Integrative Bioscience Institute for Molecular Science National Institutes of Natural Sciences Higashiyama Myodaijicho Okazaki Aichi 444‐8787 (Japan) Organic Materials Group Polymer Materials Unit National Institute for Materials Science 1‐2‐1 Sengen Tsukuba Ibaraki 305‐0047 (Japan) Core Research for Evolutional Science and Technology (Japan) Science and Technology Agency Sanban‐cho Chiyoda‐ku Tokyo 102‐0075 (Japan)

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Observation of Excitonic N-Body Bound States: Polyexcitons in Diamond

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Physical Review Letters 2013年第2期111卷 026402-026402页

作者： J. Omachi T. Suzuki K. Kato N. Naka K. Yoshioka M. Kuwata-Gonokami Photon Science Center The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan Core Research for Evolutional Science and Technology (CREST) JST 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan Department of Applied Physics The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan Department of Physics Kyoto University Kitashirakawa Sakyo-ku Kyoto 606-8502 Japan Department of Physics The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan

We have found a series of resonances associated with the bound state (polyexcitons, PENs) of N excitons up to N=6 in the emission spectra of diamond under two-photon excitation at around 10 K. Time-resolved spectra show a stepwise formation of PENs with smaller to larger N, as well as a successive decay from larger to smaller N. At higher excitation levels, the transformation of PENs into a condensed phase of electron-hole droplets occurs. The binding energies of the PENs, normalized to the exciton Rydberg energy, agree well with those of silicon, suggesting the universality of the phenomena.

关键词： EXCITON theory BOUND states (Quantum mechanics) NITROGEN DIAMONDS RYDBERG states SILICON

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Hierarchical TIO2 brush type nanostructures for efficient photoelectrochemical water splitting

Hierarchical TIO2 brush type nanostructures for efficient ph...

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16th International Conference on Miniaturized Systems for Chemistry and Life sciences, MicroTAS 2012

作者： Pihosh, Yuriy Mawatari, Kazuma Turkevych, Ivan Le, Thu.H.H. Kajita, Yasuhito Chinen, Hiroyuki Tosa, Masahiro Kitamori, Takehiko Department of Applied Chemistry University of Tokyo Japan Core Research for Evolutional Science and Technology Japan Science and Technology Agency Japan Research Center of Photovoltaics National Institute of Advanced Industrial Science and Technology Japan Innovative Tribomaterials Group National Institute for Materials Science Japan

ISBN: (纸本)9780979806452

In this work, we developed a new type of nanostructured photoanode for a photoelectrochemical water splitting. The photoanode is based on hierarchical brush Titanium dioxide (TIO2) nanostructures (BTNs), which were fabricated by our recently reported Glancing Angle Deposition and Oxidation (GLADOX) technique. The maximum incident photon-to-current efficiency (IPCE) of the BTNs photoanode was around 22% in the UV region and around 5% in the VIS light. The integral IPCE of the BTNs measured under bias of 0.5V under UV light illumination was 30 times higher compared to the photoanode based on TIO 2 nanorods and about 200 times higher compared to the one based on TIO2 flat film. These results demonstrate that the brush TIO 2 nanostructures is a promising material for effective hydrogen generation via photocatalytic water splitting.

关键词： Fuel cells

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Ambipolar transport in bulk crystals of a topological insulator by gating with ionic liquid

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Physical Review B 2012年第7期86卷 075306-075306页

作者： Kouji Segawa Zhi Ren Satoshi Sasaki Tetsuya Tsuda Susumu Kuwabata Yoichi Ando Institute of Scientific and Industrial Research Osaka University Ibaraki Osaka 567-0047 Japan Frontier Research Base for Global Young Researchers Graduate School of Engineering Osaka University 2-1 Yamada-oka Suita Osaka 565-0871 Japan Department of Applied Chemistry Graduate School of Engineering Osaka University 2-1 Yamada-oka Suita Osaka 565-0871 Japan Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency (JST) Kawaguchi Saitama 332-0012 Japan

We report that the ionic-liquid gating of bulk single crystals of a topological insulator can control the type of the surface carriers and even results in ambipolar transport. This was made possible by the use of a highly bulk-insulating BiSbTeSe2 system where the chemical potential is located close to both the surface Dirac point and the middle of the bulk band gap. Thanks to the use of ionic liquid, the control of the surface chemical potential by gating was possible on the whole surface of a bulk three-dimensional sample, opening new experimental opportunities for topological insulators. In addition, our data suggest the existence of a nearly reversible electrochemical reaction that causes bulk carrier doping into the crystal during the ionic-liquid gating process.

关键词： TOPOLOGICAL insulators GATING system (Founding) IONIC liquids DIRAC equation BISMUTH compounds ELECTROCHEMISTRY

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Polymer-Protected and Au-Containing Bi- and Trimetallic Nanoparticles as Novel Catalysts for Glucose Oxidation

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Macromolecular Symposia 2012年第1期317-318卷

作者： Naoki Toshima Haijun Zhang Department of Applied Chemistry Tokyo University of Science Yamaguchi SanyoOnoda Yamaguchi 756-0884 Japan Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency (JST) Kawaguchi Saitama 332-0012 Japan

Polymer-protected metal nanoparticles (NPs) are recognized as a type of complex between a polymer and metal NPs, since the metal NPs are stabilized by coordination to the polymer. Thus, they can work as an effective catalyst in a dispersed state due to their high surface area-to-volume ratio and high stability by protection with poly(N-vinyl-2-pyrrolidone) (PVP). In this study, colloidal dispersions of PVP-protected and Au-containing bi- and trimetallic NPs were prepared and applied to the catalyst for the aerobic oxidation of glucose into gluconic acid in an alkaline solution. The AuAg and AuPt bimetallic NPs were more active than the Au NPs although the Ag and Pt NPs were less active than the Au NPs. The AuAgPt (Au/Ag/Pt = 7/2/1) trimetallic NPs were the most active catalyst for the same reaction. The high activity can be explained by electronic charge transfer from the Ag or Pt to the Au.

关键词： Ag Au catalyst bimetallic nanoparticles gluconic acid glucose oxidation Pt trimetallic nanoparticles

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Terahertz Wave Emission from Intrinsic Josephson Junctions in Bi2Sr2CaCu2O8+δ

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Journal of Physics: Conference Series 2012年第2期400卷

作者： K Kadowaki T Kashiwagi H Asai M Tsujimoto M Tachiki K Delfanazari R A Klemm Institute of Materials Science and Graduate School of Pure & Applied Sciences University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305-8573 Japan WPI-MANA satellite National Institute for Materials Science(NIMS) 1-1 Namiki Tsukuba Ibaraki 305-0044 JAPAN Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency (JST) Sanban-cho Bldg. 4F 5 Sanban-cho Chiyoda-ku Tokyo 102-0075 Japan Department of Physics Bldg. 121 PS 402 University of Central Florida 4000 Central Florida Blvd. Orlando FL 32816-2385 USA

We have studied the conditions for the THz radiation in many systems with different shapes and dimensions such as rectangles, squares, cylinders and (equilateral and isosceles including right-angled isosceles) triangles and rectangles with non-uniform width (asymmetric rectangles) fabricated from single crystals of Bi2Sr2CaCu2O8+δ, which are known as a typical intrinsic Josephson junction system. As a result two conditions have been deduced to be fulfilled: one is the ac-Josephson effect always working at each intrinsic Josephson junction. Another one is the standing wave formation of the THz waves excited inside the mesa due to the cavity resonance for the radiation. The former condition is always necessary for the radiation but the latter may have only the secondary role for the radiation because the Q-value of the resonance cavity in some cases seems to be quite low and of order of unity. Therefore, the radiation frequency can be controlled by the voltage effectively and widely varied by the ac-Josephson effect only. In addition, we show a new phenomenon observed at high current region and a comprehensive physical picture for the extraordinary THz radiation phenomenon is given.

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Efficient and accurate linear algebraic methods for large-scale electronic structure calculations with nonorthogonal atomic orbitals

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Physical Review B 2011年第16期83卷 165103-165103页

作者： H. Teng T. Fujiwara T. Hoshi T. Sogabe S.-L. Zhang S. Yamamoto Center for Research and Development of Higher Education The University of Tokyo Bunkyo-ku Tokyo 113-8656 Japan Core Research for Evolutional Science and Technology Japan Science and Technology Agency (CREST-JST) Japan Department of Applied Mathematics and Physics Tottori University Tottori 680-8550 Japan School of Information Science and Technology Aichi Prefecture University Nagakute-cho Aichi 480-1198 Japan Department of Computational Science and Engineering Nagoya University Chikusa-ku Nagoya 464-8603 Japan School of Computer Science Tokyo University of Technology Katakura-machi Hachioji Tokyo 192-0982 Japan

The need for large-scale electronic structure calculations arises recently in the field of material physics, and efficient and accurate algebraic methods for large simultaneous linear equations become greatly important. We investigate the generalized shifted conjugate orthogonal conjugate gradient method, the generalized Lanczos method, and the generalized Arnoldi method. They are the solver methods of large simultaneous linear equations of the one-electron Schrödinger equation and map the whole Hilbert space to a small subspace called the Krylov subspace. These methods are applied to systems of fcc Au with the NRL tight-binding Hamiltonian [F. Kirchhoff et al., Phys. Rev. B 63, 195101 (2001)]. We compare results by these methods and the exact calculation and show them to be equally accurate. The system size dependence of the CPU time is also discussed. The generalized Lanczos method and the generalized Arnoldi method are the most suitable for the large-scale molecular dynamics simulations from the viewpoint of CPU time and memory size.

关键词： LINEAR algebraic groups CONJUGATE gradient methods APPROXIMATION theory NUMERICAL solutions to equations HILBERT space

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Competition between instabilities of Peierls transition and Mott transition in W-doped VO2 thin films

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Physical Review B 2011年第19期84卷 195132-195132页

作者： Enju Sakai Kohei Yoshimatsu Keisuke Shibuya Hiroshi Kumigashira Eiji Ikenaga Masashi Kawasaki Yoshinori Tokura Masaharu Oshima Department of Applied Chemistry University of Tokyo Bunkyo-ku Tokyo 113-8656 Japan Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency (JST) Bunkyo-ku Tokyo 113-8656 Japan Cross-Correlated Materials Research Group (CMRG) Advanced Science Institute RIKEN Wako 351-0198 Japan PRESTO Japan Science and Technology Agency (JST) Kawaguchi Saitama 332-0012 Japan Synchrotron Radiation Research Organization University of Tokyo Bunkyo-ku Tokyo 113-8656 Japan JASRI/SPring-8 Mikazuki-cho Hyogo 679-5198 Japan World Premier International-Advanced Institute for Materials Research (WPI-AIMR) Tohoku University Sendai 980-8577 Japan Department of Applied Physics and Quantum-Phase Electronics Center University of Tokyo Tokyo 113-8656 Japan Multiferroics Project ERATO Japan Science and Technology Agency (JST) Tokyo 113-8656 Japan

The change in electronic structure of V1−xWxO2 thin films across a metal-insulator transition (MIT) is investigated in terms of hard x-ray photoemission spectroscopy and x-ray absorption spectroscopy. In the lower doping range (0 ≤ x ≤ 0.08), the spectra exhibit the characteristic features for the dimerization of V ions in the monoclinic phase, indicating that Peierls-like instability predominately causes the MIT in this range. Conversely, in the higher doping range (0.1 ≤ x), spectral weight transfer is observed from the coherent part at the Fermi level to the incoherent part, indicating that the ground state of V1−xWxO2 films in this range is a typical Mott insulator. The results suggest that the unusual phase diagram of the V1−xWxO2 thin films originates from the competition between the Peierls and Mott instabilities.

关键词： ELECTRONIC structure VANADIUM TUNGSTEN OXYGEN THIN films METAL-insulator transitions PHOTOELECTRON spectroscopy ABSORPTION spectra

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Completely characterizing single attosecond pulses by the modified spectral phase interferometry

Completely characterizing single attosecond pulses by the mo...

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International Conference on Ultrafast Phenomena, UP 2010

作者： Zhu, J. Fang, S. Yamane, K. Chen, T. Yamashita, M. Department of Applied Physics Hokkaido University Core Research for Evolutional Science and Technology Japan Science and Technology Agency Kita-13 Nishi-8 Kita-ku Sapporo 060-8628 Japan

Complete characterization of single attosecond pulses by the modified spectral phase interferometry is presented considering the frequency-dependent spectral shear. The results show no principle limitation of characte...

ISBN: (纸本)9781557528940

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