Scientific Commons: M. Kawasaki

Complex extension of potentials and trajectories of poles of the S-matrix element in the complex momentum plane (2008)

Searching for infrastructure of the quantum mechanical system, we study trajectories of the s-wave poles of the S-matrix element with respect to a real phase $\alpha$ in the complex momentum plane...

Mutual transformation among bound, virtual and resonance states in one-dimensional rectangular potentials (2008)

Kawasaki, M., Maehara, T., Yonezawa, M.

A detailed analysis has been made by R.Zavin and N.Moiseyev(2004 J. Phys. A: Math, Gen, \textbf{37} 4619) for the change of bound states into resonance states via coalescence of virtual states in a...

Inhomogeneous baryogenesis, cosmic antimatter, and dark matter (2008)

Dolgov, A. D., Kawasaki, M., Kevlishvili, N.

A model of inhomogeneous baryogenesis based on the Affleck and Dine mechanism is described. A simple coupling of the scalar baryon field to the inflaton allows for formation of astronomically...

Bulk-like d band of SrVO3 under a self-protective cap layer (2008)

Takizawa, M., Minohara, M., Kumigashira, H., Toyota, D., Oshima, M., Wadati, H., ...

We have performed a detailed angel-resolved photoemission spectroscopy study of in-situ prepared SrVO3 thin films. Naturally capped by a ``transparent'' protective layer, contributions from surface...

Role of charge carriers for ferromagnetism in cobalt-doped rutile TiO2 (2008)

Fukumura, T, Toyosaki, H, Ueno, K, Nakano, M, Kawasaki, M

Electric and magnetic properties of a high temperature ferromagnetic oxide semiconductor, cobalt-doped rutile TiO2, are summarized. The cobalt-doped rutile TiO2 epitaxial thin films with different...

Vacuum ultraviolet photodissociation and surface morphology change of water ice films dosed with hydrogen chloride (2007)

Yabushita, A, Kanda, D, Kawanaka, N, Kawasaki, M

Effective interaction energy of water dimer at room temperature: An experimental and theoretical study (2007)

Nakayama, T, Fukuda, H, Kamikawa, T, Sakamoto, Y, Sugita, A, Kawasaki, M, ...

In-situ photoemission study of Pr_{1-x}Ca_xMnO_3 epitaxial thin films with suppressed charge fluctuations (2007)

Wadati, H., Maniwa, A., Chikamatsu, A., Ohkubo, I., Kumigashira, H., Oshima, M., ...

We have performed an {\it in-situ} photoemission study of Pr_{1-x}Ca_xMnO_3 (PCMO) thin films grown on LaAlO_3 (001) substrates and observed the effect of epitaxial strain on the electronic...

Gradual Disappearance of the Fermi Surface near the Metal-Insulator Transition in La$_{1-x}$Sr$_{x}$MnO$_{3}$ (2007)

Chikamatsu, A., Wadati, H., Kumigashira, H., Oshima, M., Fujimori, A., Lippmaa, M., ...

We report the first observation of changes in the electronic structure of La$_{1-x}$Sr$_{x}$MnO$_{3}$ (LSMO) across the filling-control metal-insulator (MI) transition by means of in situ...

Principles of superplasticity in ultrafine-grained materials. (2007)

Kawasaki, M., Langdon, T.G.

Optical probe of electrostatic doping in an n-type Mott insulator (2007)

Nakamura, M., Sawa, A., Sato, H., Akoh, H., Kawasaki, M., Tokura, Y.

Electrostatic doping into an $n$-type Mott insulator Sm$_{2}$CuO$_{4}$ has been successfully achieved with use of the heterojunction with an $n$-type band semiconductor Nb-doped SrTiO$_{3}$. The...

Extending creep and superplasticity to materials with submicrometer grain sizes. (2007)

Kawasaki, M., Xu, C., Horita, Z., Langdon, T.G.

Achieving superplastic behaviour in F.C.C. and H.C.P. metals processed by ECAP (2007)

Figueiredo, R.B., Kawasaki, M., Xu, C., Langdon, T.G.

Grain-boundary sliding in a superplastic zinc-aluminum alloy processed using severe plastic deformation. (2007)

Kawasaki, M., Langdon, T.G.

Mechanical properties of a spray-cast aluminum alloy processed by severe plastic deformation (2007)

Xu, C., Kawasaki, M., Furukawa, M., Horita, Z., Langdon, T.G

Experiments were conducted to evaluate the mechanical properties of a spray-cast Al7034 alloy processed by severe plastic deformation. The alloy was received with an average grain size of ~2.1 ﾵm...

Effective interaction energy of water dimer at room temperature: An experimental and theoretical study (2007)

Nakayama, T., Fukuda, H., Kamikawa, T., Sakamoto, Y., Sugita, A., Kawasaki, M., ...

Kinetics and mechanism of the gas phase reaction of chlorine atoms with i-propanol (2007)

Yamanaka, T., Kawasaki, M., Hurley, M. D., Wallington, T. J., Schneider, W. F., Bruce, J.

Fiber-optic ring-down spectroscopy using a tunable picosecond gain-switched diode laser (2007)

Andachi, M., Nakayama, T., Kawasaki, M., Kurokawa, S.

Measurements of the 3v(3) band of (NNO)-N-14-N-15-O-16 and (NNO)-N-15-N-14-O-16 using continuous-wave cavity ring-down spectroscopy (2007)

Nakayama, T., Fukuda, H., Kamikawa, T., Sugita, A., Kawasaki, M., Morino, I., ...

Direct observation and reactions of Cl-3 radical (2006)

Enami, S, Yamanaka, T, Hashimoto, S, Kawasaki, M, Aloisio, S, Tachikawa, H

Photodissociation of polycrystalline and amorphous water ice films at 157 and 193 nm (2006)

Yabushita, A, Kanda, D, Kawanaka, N, Kawasaki, M, Ashfold, MNR

Shifting donor-acceptor photoluminescence in N-doped ZnO (2006)

Makino, Takayuki, Tsukazaki, A., Ohtomo, A., Kawasaki, M., Koinuma, H.

We have grown nitrogen-doped ZnO films grown by two kinds of epitaxial methods on lattice-matched ScAlMgO$_4$ substrates. We measured the photoluminescence (PL) of the two kinds of ZnO:N layers in...

Hole Transport in p-Type ZnO (2006)

Makino, Takayuki, Ohtomo, Akira, Tsukazaki, A., Kawasaki, M., Koinuma, H.

A two-band model involving the A- and B-valence bands was adopted to analyze the temperature dependent Hall effect measured on N-doped \textit{p}-type ZnO. The hole transport characteristics...

Photoemission from buried interfaces in SrTiO3/LaTiO3 superlattices (2006)

Takizawa, M., Wadati, H., Tanaka, K., Hashimoto, M., Yoshida, T., Fujimori, A., ...

We have measured photoemission spectra of SrTiO3/LaTiO3 superlattices with a topmost SrTiO3 layer of variable thickness. Finite coherent spectral weight with a clear Fermi cut-off was observed at...

Electronic Structure and Optical Properties of the Co-doped Anatase TiO$_{2}$ Studied from First Principles (2006)

Weng, Hongming, Yang, Xiaoping, Dong, Jinming, Mizuseki, H., Kawasaki, M., Kawazoe, Y.

The Co-doped anatase TiO$_{2}$, a recently discovered room-temperature ferromagnetic insulator, has been studied by the first-principles calculations in the pseudo-potential plane-wave formalism...

Effect of strong localization of doped holes in angle-resolved photoemission spectra of La$_{1-x}$Sr$_x$FeO$_3$ (2006)

Wadati, H., Chikamatsu, A., Takizawa, M., Hashimoto, R., Kumigashira, H., Yoshida, T., ...

We have performed an angle-resolved photoemission spectroscopy study of La$_{0.6}$Sr$_{0.4}$FeO$_3$ using {\it in situ} prepared thin films and determined its band structure. The experimental band...

Indication of intrinsic room-temperature ferromagnetism in Ti1-xCoxO2-d thin film: An x-ray magnetic circular dichroism study (2006)

Mamiya, K., Koide, T., Fujimori, A., Tokano, H., Manaka, H., Tanaka, A., ...

Soft x-ray magnetic circular dichroism (XMCD) measurements at the Co L2,3 edges of Co doped rutile TiO2 at room temperature have revealed clear multiplet features characteristic of ferromagnetic Co2+...

Monte-Carlo simulation of localization dynamics of excitons in ZnO and CdZnO quantum well structures (2006)

Makino, T., Saito, K., Ohtomo, A., Kawasaki, M., Senger, R. T., Bajaj, K. K.

Localization dynamics of excitons was studied for ZnO/MgZnO and CdZnO/MgZnO quantum wells (QW). The experimental photoluminescence (PL) and absorption data were compared with the results of Monte...

An investigation of cavitation in the tensile testing of a spray-cast aluminum alloy processed by ECAP (2006)

Kawasaki, M., Xu, C., Langdon, T.G.

The significance of cavitation in a superplastic aluminium alloy processed by ECAP (2006)

Kawasaki, M., Xu, C., Langdon, T.G.

The Gravitino-Overproduction Problem in Inflationary Universe. (2006)

M. Kawasaki, DESY Forschung Hochenergiephysik, F. Takahashi, T.T. Yanagida

Journal article

Gravitino Overproduction in Inflaton Decay. (2006)

M. Kawasaki, DESY Forschung Hochenergiephysik, F. Takahashi, T.T. Yanagida

Journal article

Inflaton Decay through Supergravity Effects. (2006)

M. Endo, DESY Forschung Hochenergiephysik, M. Kawasaki, F. Takahashi, T.T. Yanagida

Journal article

Buffer-gas pressure broadening for the (30(0)1)(III) (2006)

Nakamichi, S, Kawaguchi, Y, Fukuda, H, Enami, S, Hashimoto, S, Kawasaki, M, ...

Kinetic study of the ClOO plus NO reaction using cavity ring-down spectroscopy (2006)

Enami, S, Hoshino, Y, Ito, Y, Hashimoto, S, Kawasaki, M, Wallington, TJ

Temperature and pressure dependence of the rate constants of the reaction of NO3 radical with CH3SCH3 (2006)

Nakano, Y, Ishiwata, T, Aloisio, S, Kawasaki, M

Ion imaging comes of age (2006)

Suits, AG, Kawasaki, M, Lawrance, W

Kinetic study of IO radical with RO2 (R = CH3, C2H5, and CF3) using cavity ring-down spectroscopy (2006)

Enami, S, Yamanaka, T, Hashimoto, S, Kawasaki, M, Nakano, Y, Ishiwata, T

Direct observation and reactions of Cl-3 radical (2006)

Enami, S, Yamanaka, T, Hashimoto, S, Kawasaki, M, Aloisio, S, Tachikawa, H

Photodissociation of polycrystalline and amorphous water ice films at 157 and 193 nm (2006)

Yabushita, A, Kanda, D, Kawanaka, N, Kawasaki, M, Ashfold, MNR

Self-assembly of alkanethiol monolayers on Ag-Au(111) alloy surfaces (2006)

Kawasaki, M, Iino, M

Enhanced intra-aggregate charge separation from binary excitons in mixed J-aggregates of cyanine dyes (2006)

Kawasaki, M, Aoyama, S, Kozawa, E

1064-nm laser fragmentation of thin Au and Ag flakes in acetone for highly productive pathway to stable metal nanoparticles (2006)

Kawasaki, M, Nishimura, N

Robust Ti4+ states in SrTiO3 layers of La0.6Sr0.4MnO3/SrTiO3/ La0.6Sr0.4MnO3 junctions (2005)

Kumigashira, H., Chikamatsu, A., Hashimoto, R., Oshima, M., Ohnishi, T., Lippmaa, M., ...

We have investigated the interfacial electronic structure of La0.6Sr0.4MnO3 (LSMO)/ SrTiO3 (STO)/ LSMO heterojunctions utilizing the elemental selectivity of photoemission spectroscopy. The Ti 2p...

Majority-Carrier Mobilities in Undoped and \textit{n}-type Doped ZnO Epitaxial Layers (2005)

Makino, T., Segawa, Y., Tsukazaki, A., Ohtomo, A., Kawasaki, M.

Transparent and conductive ZnO:Ga thin films are prepared by laser molecular-beam epitaxy. Their electron properties were investigated by the temperature-dependent Hall-effect technique. The 300-K...

Spectral shape analysis of ultraviolet luminescence in \textit{n}-type ZnO:Ga (2005)

Makino, T., Segawa, Y., Yoshida, S., Tsukazaki, A., Ohtomo, A., Kawasaki, M., ...

Thin films of laser molecular-beam epitaxy grown \textit{n}-type Ga-doped ZnO were investigated with respect to their optical properties. Intense room-temperature photoluminescence (PL) in the...

Analysis on reflection spectra in strained ZnO thin films (2005)

Makino, T., Segawa, Y., Kawasaki, M., Ohtomo, A.

Thin films of laser molecular-beam epitaxy grown ZnO films were studied with respect to their optical properties. 4-K reflectivity was used to analyze various samples grown at different biaxial...

Determination of the intrinsic anomalous Hall effect of SrRuO$_3$ (2005)

Mathieu, R., Jung, C. U., Yamada, H., Asamitsu, A., Kawasaki, M., Tokura, Y.

The anomalous Hall effect (AHE) of epitaxial SrRuO$_3$ films with varying lattice parameters is investigated, and analyzed according to the Berry-phase scenario. SrRuO$_3$ thin films were deposited...

Signature of Carrier-Induced Ferromagnetism in Ti_{1-x}Co_{x}O_{2-delta}: Exchange Interaction Between High-Spin Co 2+ and the Ti 3d Conduction Band (2005)

Quilty, J. W., Shibata, A., Takubo, K., Mizokawa, T., Toyosaki, H., ...

X-ray photoemission spectroscopy measurements were performed on thin-film samples of rutile Ti_{1-x}Co_{x}O_{2-delta} to reveal the electronic structure. The Co 2p core level spectra indicate that...

A ferromagnetic oxide semiconductor as spin injection electrode in magnetic tunnel junction (2005)

Toyosaki, H., Fukumura, T., Ueno, K., Nakano, M., Kawasaki, M.

A magnetic tunnel junctions composed of room temperature ferromagnetic semiconductor rutile Ti1-xCoxO2-d and ferromagnetic metal Fe0.1Co0.9 separated by AlOx barrier showed positive tunneling...

Electron transport in ZnO thin films (2005)

Makino, T., Segawa, Y., Tsukazaki, A., Ohtomo, A., Kawasaki, M.

Epitaxial, n-type ZnO films grown by a laser molecular-beam epitaxy method were investigated by the temperature-dependent Hall-effect technique. The 300-K carrier concentration and mobility were...

511 keV Gamma Ray from Moduli Decay in the Galactic Bulge (2005)

Kawasaki, M., Yanagida, T.

We show that the $e^++e^-$ decay of a light scalar boson of mass 1-10 MeV may account for the fluxes of 511 keV gamma ray observed by SPI/INTEGRAL. We argue that candidates of such a light scalar...

High Throughput Oxide Lattice Engineering by Parallel Laser Molecular Beam Epitaxy and Concurrent X-ray Diffraction (2005)

Ohtani, M., Lippmaa, M., Ohnishi, T., Kawasaki, M.

A novel laser molecular beam epitaxy (LMBE) system for the fabrication of atomically controlled oxides superlattices and an x-ray diffractometer that measures spatially-resolved x-ray diffraction...

Evolution of ferromagnetic circular dichroism coincident with magnetization and anomalous Hall effect in Co-doped rutile TiO2 (2005)

Toyosaki, H., Fukumura, T., Yamada, Y., Kawasaki, M.

Magnetic circular dichroism (MCD) of rutile Ti1-xCoxO2-d is systematically examined with various x and d to reveal a phase diagram for the appearance of ferromagnetism at higher carrier concentration...

The band structure and Fermi surface of La$_{0.6}$Sr$_{0.4}$MnO$_{3}$ thin films studied by in-situ angle-resolved photoemission spectroscopy (2005)

Chikamatsu, A., Wadati, H., Kumigashira, H., Oshima, M., Fujimori, A., Hamada, N., ...

We have performed an in situ angle-resolved photoemission spectroscopy (ARPES) on single-crystal surfaces of La$_{0.6}$Sr$_{0.4}$MnO$_{3}$ (LSMO) thin films grown on SrTiO$_{3}$ (001) substrates by...

Exciton-optical-phonon coupling: comparison with experiments for ZnO quantum wells (2005)

Makino, T., Segawa, Y., Kawasaki, M.

The temperature-dependent linewidths of excitons in ZnO quantum wells were studied by measuring absorption spectra from 5 K to room temperature. We deduced experimentally the...

Andrearczyk, T., Jaroszynski, J., Grabecki, G., Dietl, T., Fukumura, T., Kawasaki, M.

Effects of spin-orbit coupling and s-d exchange interaction are probed by magnetoresistance measurements carried out down to 50 mK on ZnO and Zn_{1-x}Mn_{x}O with x = 3 and 7%. The films were...

Measurement of regional distribution of atmospheric NO2 and aerosol particles with flashlight long-path optical monitoring (2005)

Fuqi, S, Kuze, H, Yoshii, Y, Nemoto, M, Takeuchi, N, Kimura, T, ...

Photodissociation dynamics of CH3CFCl2 and CDCl3 at 205-209 nm (2005)

Mashino, M, Yamada, H, Sugita, A, Kawasaki, M

Enhanced molecular fluorescence near thick Ag island film of large pseudotabular nanoparticles (2005)

Kawasaki, M, Mine, S

Laser fragmentation of water-suspended gold flakes via spherical submicroparticles to fine nanoparticles (2005)

Kawasaki, M, Masuda, K

Highly efficient surface-enhanced fluorescence on Ag island film of large pseudotabular nanoparticles (2005)

Kawasaki, M, Mine, S

Rate constants of the reaction of NO3 with CH3I measured with use of cavity ring-down spectroscopy (2005)

Nakano, Y, Ishiwata, T, Kawasaki, M

Direct observation of adduct formation of alkyl and aromatic iodides with Cl atoms using cavity ring-down spectroscopy (2005)

Enami, S, Yamanaka, T, Hashimoto, S, Kawasaki, M, Tonokura, K

Manifestation of Correlation Effects in the photoemission spectra of Ca$_{1-x}$Sr$_x$RuO$_3$ (2004)

Takizawa, M., Toyota, D., Wadati, H., Chikamatsu, A., Kumigashira, H., Fujimori, A., ...

We have measured soft x-ray photoemission and O 1{\it s} x-ray absorption spectra of Ca$_{1-x}$Sr$_x$RuO$_3$ thin films prepared {\it in situ}. The coherent and incoherent parts have been identified...

Room-temperature stimulated emission from ZnO multiple quantum wells grown on lattice-matched substrates (2004)

Makino, T., Segawa, Y., Kawasaki, M., Koinuma, H.

The optical properties of ZnO quantum wells, which have potential application of short-wavelength semiconductor laser utilizing a high-density excitonic effect, were investigated. Stimulated emission...

Hysteretic current-voltage characteristics and resistance switching at an epitaxial oxide Schottky junction SrRuO$_{3}$/SrTi$_{0.99}$Nb$_{0.01}$O$_{3}$ (2004)

Fujii, T., Kawasaki, M., Sawa, A., Akoh, H., Kawazoe, Y., Tokura, Y.

Transport properties have been studied for a perovskite heterojunction consisting of SrRuO$_{3}$ (SRO) film epitaxially grown on SrTi$_{0.99}$Nb$_{0.01}$O$_{3}$ (Nb:STO) substrate. The SRO/Nb:STO...

Temperature-dependent soft x-ray photoemission and absorption studies of charge disproportionation in La$_{1-x}$Sr$_x$FeO$_3$ (2004)

Wadati, H., Chikamatsu, A., Hashimoto, R., Takizawa, M., Kumigashira, H., Fujimori, A., ...

We have measured the temperature dependence of the photoemission and x-ray absorption spectra of La$_{1-x}$Sr$_x$FeO$_3$ (LSFO) epitaxial thin films with $x=0.67$, where charge disproportionation...

Optical Properties of Excitons in ZnO-based Quantum Well Heterostructures (2004)

Makino, T., Segawa, Y., Kawasaki, M., Koinuma, H.

Recently the developments in the field of II-VI-oxides have been spectacular. Various epitaxial methods has been used to grow epitaxial ZnO layers. Not only epilayers but also sufficiently...

Hysteretic current-voltage characteristics and resistance switching at a rectifying Ti/Pr$_{0.7}$Ca$_{0.3}$MnO$_{3}$ interface (2004)

Sawa, A., Fujii, T., Kawasaki, M., Tokura, Y.

We have characterized the vertical transport properties of epitaxial layered structures composed of Pr$_{0.7}$Ca$_{0.3}$MnO$_{3}$ (PCMO) sandwiched between SrRuO$_{3}$ (SRO) bottom electrode and...

Early reionization by decaying particles and cosmic microwave background radiation (2004)

Kasuya, S., Kawasaki, M.

We study the reionization scenario in which ionizing UV photons emitted from decaying particle, in addition to usual contributions from stars and quasars, ionize the universe. It is found that the...

In situ photoemission study on atomically-controlled La$_{1-x}$Sr$_x$MnO$_3$ thin films: Composition dependence of the electronic structure (2004)

Horiba, K., Chikamatsu, A., Kumigashira, H., Oshima, M., Nakagawa, N., Lippmaa, M., ...

We have investigated change in the electronic structures of atomically-controlled La$_{1-x}$Sr$_x$MnO$_3$ (LSMO) thin films as a function of hole-doping level ($x$) in terms of {\it in situ}...

Gallium concentration dependence of room-temperature near-bandedge luminescence in n-type ZnO:Ga (2004)

Makino, T., Segawa, Y., Yoshida, S., Tsukazaki, A., Ohtomo, A., Kawasaki, M.

We investigated the optical properties of epitaxial \textit{n}-type ZnO films grown on lattice-matched ScAlMgO$

M. Kawasaki

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