Kazutaka G. Nakamura

Tokyo Institute of Technology

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Co-Authors

Masahiro Kitajima

National Institute for Materials Science

Ken‐ichi Kondo

Aichi Medical University Hospital

Yoichiro Hironaka

Osaka University

Jianbo Hu

China Academy of Engineering Physics

Yōsuke Kayanuma

Tokyo Institute of Technology

Nobuaki Kawai

Sony Computer Science Laboratories

Kunie Ishioka

National Institute for Materials Science

Yasuaki Okano

Institute for Molecular Science

Toshiyuki Atou

Tokyo Institute of Technology

Hiroaki Kishimura

National Defense Academy of Japan

Cooperative Institutions

Boston University

188

University of Bern

179

Albert Einstein College of Medicine

174

University of California, Irvine

174

Duke University

169

Tokyo Institute of Technology

166

The University of Tokyo

164

Universidad Autónoma de Madrid

152

Eötvös Loránd University

143

Colorado State University

142

Author Statistics

Papers

Citation

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Dual role of longitudinal optical phonons for generation of coherent oscillations in gallium arsenide under optical pumping

Physical review. B./Physical review. B (2024)

Itsuki Takagi Yuma Konno Yōsuke Kayanuma Kazutaka G. Nakamura

The authors propose here a simple picture of the generation dynamics of coherent optical phonons and phonon-plasmon coupled modes by ultrafast infrared pulses in gallium arsenide. This picture can explain the spectral coexistence of the bare phonons and the phonon-plasmon coupled modes by their being in different subspaces of Hilbert space (electronic ground and excited states), rather than separated in real space. The quantum mechanical calculations reproduce well the coherent oscillations obtained in transient reflectivity measurements.

10.1103/physrevb.110.024314

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Citations (0)

UV Photoemission Study on the Valence Band of Mo(110) During Argon Ion Bombardment.

Hyomen Kagaku (1991)

Masahlro KITAJIMA Kazutaka G. Nakamura M. Fujitsuka H. Shinno Hiroo KATOH

The electronic structure change in the valence band of molybdenum (110) during argon ion bombardment is studied. The UPS measurements using synchrotron radiation show that argon ion bombardment induces a reduction in intensity of the peak at 4.10 eV below Fermi energy and a decrease in the work function. This peak reduction is explained in terms of substitution of a vacancy for a molybdenum atom. The decrease in the work function also suggests that vacancies are being created in the surface region due to argon ion bombardment.

10.1380/jsssj.12.452

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Study on deuterium absorption of Pd at high-pressure D2 gas and low temperatures

Il Nuovo Cimento D (1992)

Giovanni Maizza Kazutaka G. Nakamura M. Fuijtsuka Masahiro Kitajima

10.1007/bf02455341

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Thin tape target driver for laser ion accelerator

Review of Scientific Instruments (2003)

Takuya Nayuki Yuji Oishi Takashi Fujii Kae Nemoto T. Kayoiji

A thin tape target driver for laser ion acceleration was developed. The driver can move a copper tape of 5 μm thickness with a positioning reproducibility of less than 30 μm (peak to valley), which is sufficient for a laser irradiation target. Using this tape target and laser pulses of energy 350 mJ and duration 60 fs, protons of energies of over 1 MeV were accelerated in the forward direction.

10.1063/1.1578156

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Citations (58)

Evolving shock-wave profiles measured in a silicon crystal by picosecond time-resolved x-ray diffraction

Applied Physics Letters (2000)

Yoichiro Hironaka Akio Yazaki Fumikazu Saito Kazutaka G. Nakamura Ken‐ichi Kondo

Picosecond time-resolved x-ray diffraction is used to probe single-crystal silicon under pulsed-laser irradiation (300 ps pulse at 1.4 J/cm2) at an interval of 60 ps. The observed rocking curves show shock compression of the silicon lattice by the laser irradiation. Uniaxial strain profiles perpendicular to the Si(111) plane are estimated using dynamical x-ray diffraction theory. The temporal and spatial evolution of the profiles indicates a propagating shock wave with the velocity of 9.4 km/s inside the silicon crystal. The observed maximum compression is 1.05%, which corresponds to a pressure of 2.18 GPa.

Picosecond

Crystal (programming language)

Lattice constant

10.1063/1.1313297

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Citations (50)

ChemInform Abstract: NUCLEAR MAGNETIC RESONANCE STUDIES OF COBALT COMPLEXES. COBALT‐59 NUCLEAR MAGNETIC RESONANCE SPECTRUM OF THE HEXAKIS(TRIMETHYL PHOSPHITE)COBALT(III) COMPLEX

Chemischer Informationsdienst (1978)

Akira Yamasaki Takashi Aoyama Satoko Fujiwara Kazutaka G. Nakamura

10.1002/chin.197820050

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Pathway for the Transformation from Highly Oriented Pyrolytic Graphite into Amorphous Diamond

Physical Review Letters (2009)

Keisuke Niwase Kazutaka G. Nakamura Manabu Yokoo Ken‐ichi Kondo Tadao Iwata

We report the discovery of a novel pathway for the transformation from highly oriented pyrolytic graphite foils into amorphous diamond platelets. This pathway consists of three stages of neutron irradiation, shock compression, and rapid quenching. We obtained transparent platelets which show photoluminescence but no diamond Raman peak, similar to the case of amorphous diamond synthesized from C60 fullerene. Wigner defects formed by irradiation are considered to make a high density of diamond nucleation sites under shock compression, of which growth is suppressed by rapid quenching.

Pyrolytic carbon

Amorphous carbon

10.1103/physrevlett.102.116803

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Citations (13)

Single-shot time-resolved X-ray scattering measurements of polycrystalline and amorphous materials under shock wave loading

Springer eBooks (2013)

Kouhei Ichiyanagi Nobuaki Kawai Shunsuke Nozawa Tokushi Sato Jianbo Hu

Nanosecond

Photon energy

Wide-angle X-ray scattering

10.1007/978-3-319-48764-9_432

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Citations (0)

Resonance enhanced multiphoton ionization detection of SiO desorbing from a Si(111) surface in reaction with O2

Applied Physics Letters (1994)

Kazutaka G. Nakamura Masahiro Kitajima

SiO molecule desorbing from Si(111) surface in reaction with pulse O2 molecular beam at the substrate temperature of 1250±50 K is measured with the 2+1 resonance enhanced multiphoton ionization. Vibrationally separated spectrum of the desorbing SiO molecule has been observed. The observed vibrational distribution is estimated to be in equilibrium with the surface temperature.

Resonance-enhanced multiphoton ionization

Molecular beam

Thermal ionization

10.1063/1.112702

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Citations (6)

Statistical mechanics of typical set decoding

Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics (2002)

Yoshiyuki Kabashima Kazutaka G. Nakamura Jort van Mourik

The performance of "typical set (pairs) decoding" for ensembles of Gallager's linear code is investigated using statistical physics. In this decoding method, errors occur, either when the information transmission is corrupted by atypical noise, or when multiple typical sequences satisfy the parity check equation as provided by the received corrupted codeword. We show that the average error rate for the second type of error over a given code ensemble can be accurately evaluated using the replica method, including the sensitivity to message length. Our approach generally improves the existing analysis known in the information theory community, which was recently reintroduced in IEEE Trans. Inf. Theory 45, 399 (1999), and is believed to be the most accurate to date.

Code (set theory)

Information Theory

Parity bit

10.1103/physreve.66.036125

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Citations (13)