Papers - Saito, Yukio

The core effect of misfit dislocations in heteroepitaxy

Hiroyasu Katsuno, Makio Uwaha and SAITO YUKIO

J. Crystal Growth 310 ( 7-9 ) 1380-1384 2008.04

Research paper (scientific journal), Joint Work

Shape of Heteroepitaxial Island Determined by Asymmetric Detachment

Yukio Saito and Ryo Kawasaki

J. Crystal Growth 310 ( 3 ) 682-687 2008.02

Research paper (scientific journal), Joint Work, Accepted

Dewetting of a solid monolayer

Olivier Pierre-Louis, Anna Chame, and Yukio Saito

Phys. Rev. Lett. 99   136101 2007.09

Research paper (scientific journal), Joint Work, Accepted

Two-Dimensional Island Shape Determined by Detachment

Yukio Saito and Ryo Kawasaki

J. Phys. Soc. Jpn 76   074604/1-6 2007.07

Research paper (scientific journal), Joint Work, Accepted

Misfit Dislocations in a Two-Dimensional Lattice Model

Hiroyasu Katsuno, Makio Uwaha and Yukio Saito

Journa of the Physical Society of Japan 76 ( 4 ) 044605.1-10 2007.04

Research paper (scientific journal), Joint Work, Accepted

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We study misfit dislocations in a two-dimensional elastic lattice model of epitaxy using Green's function. The interaction between the dislocations of the lattice model is compared with that of continuum elasticity theory. It is found that the behavior of the lattice model at a long distance agrees with that of standard continuum theory, but an additional interaction between dislocations due to extra forces around the dislocation core is important. The extra forces also lead to an increase in the dislocation interval. On a flat adsorbate surface with a periodic array of misfit dislocations, the preferential adsorption site is found to be either on the top or at the midpoint of the dislocations depending on the sign of the force dipole moment of the adatom and the sign of the misfit parameter.

Stochastic Approach to Enantiomeric Excess Amplification and Chiral Symmetry Breaking

Yukio Saito, Takeshi Sugimori, Hiroyuki Hyuga

Journal of Physical Society of Japan 76 ( 4 ) 044802-1-14 2007.04

Research paper (scientific journal), Joint Work, Accepted

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Stochastic aspects of chemical reaction models related to the Soai reactions as well as to the homochirality in life are studied analytically and numerically by the use of the master equation and a directed random walk model. For systems with a recycling back reaction, a unique final probability distribution is obtained by means of detailed balance conditions. With a nonlinear autocatalysis the distribution has a double-peak structure, indicating the chiral symmetry breaking. This problem is further analyzed by examining eigenvalues and eigenfunctions of the master equation. In the case without recycling, final probability distributions depend on the initial conditions. In the nonlinear autocatalytic case, time-evolution starting from a complete achiral state leads to a final distribution which differs from that deduced from the nonzero recycling result. This is due to the absence of the detailed balance, and a directed random walk model is shown to give the correct final profile. When the nonlinear autocatalysis is sufficiently strong and the initial state is achiral, the final probability distribution has a double-peak structure, related to the enantiomeric excess amplification. It is argued that with autocatalyses and a very small but nonzero spontaneous production, a single mother scenario could be a main mechanism to produce the homochirality

Diffusion Accelarates and Enhances Chirality Selection

Ryo Shibata, Yukio Saito and Hiroyuki Hyuga

Physical Review E 74   026117-1-7. 2006

Research paper (scientific journal), Joint Work, Accepted

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The diffusion effect on chirality selection in a two-dimensional reaction-diffusion model is studied by Monte Carlo simulations. The model consists of achiral reactants A which turn into either of the chiral products R or S in a solvent of chemically inactive vacancies V. The reaction contains a nonlinear autocatalysis as well as a recycling process, and the chiral symmetry breaking is monitored by an enantiomeric excess (ee) . Without dilution a strong nonlinear autocatalysis ensures chiral symmetry breaking. By diluting a diffusionless system, the ee decreases and a racemic state is recovered below a critical concentration cc. When the diffusion is allowed, the steady value of increases and cc decreases. As for the relation between the ee and the concentration c, a formula interpolating between the diffusionless (D=0) and the homogeneous (D=) limits is proposed by incorporating the diffusional enhancement of the concentrations of chiral species. Diffusion also accelerates the development of the chiral order, and the time required to establish the order in a system of a size L2 is inversely proportional to the diffusion constant D as L2/D.

Chirality Selection in Open Flow Systems and in Polymerization

Yukio Saito and Hiroyuki Hyuga

J. Phys. Soc. Jpn. 74 ( 5 ) 1629-1635 2005.05

Research paper (scientific journal), Joint Work, Accepted

Chirality selection in crystallization

Hyuga Hiroyuki, SAITO YUKIO

J. Physical Society of Japan 74 ( 2 ) 535-537 2005.02

Research paper (scientific journal), Joint Work, Accepted

Drift-induced step instabilities due to the gap in the diffusion coefficient

SAITO YUKIO

J. Crystal Growth 275   e129-e134 2005.02

Research paper (scientific journal), Joint Work, Accepted

Growth modes in two-dimensional heteroepitaxy on an elastic substrate

Katsuno Hiroyasu, Uemura Hideaki, Uwaha Maki, SAITO YUKIO

J. Crsytal Growth 275   e283-e288 2005.02

Research paper (scientific journal), Joint Work, Accepted

Step interactions on a 3D elastic substrate

SAITO YUKIO

J. Crystal Growth 275   e61-e66 2005.02

Research paper (scientific journal), Single Work

Random Deposition Model with a Constant Capture Length

Politi Paolo, SAITO YUKIO

Progress in theoretical physics 113 ( 1 ) 15-28 2005.01

Research paper (scientific journal), Joint Work

Evaporation and impingement effects on drift-induced step instabilities on a Si(001) vicinal face

Masahide Sato, Makio Uwaha, and Yukio Saito

Physical Review B 72   045401-1-9 2005

Research paper (scientific journal), Joint Work, Accepted

Three-Dimensional Elastic Lattice Model of Heteroepitaxy

SAITO YUKIO

Surface Science 586   83-95 2005

Research paper (scientific journal), Single Work

Fractal aggregation growth and the surrounding diffusion field

Satoru Miyashita, Yukio Saito, Makio Uwaha

J. Crystal Growth 283   533-539 2005

Research paper (scientific journal), Joint Work, Accepted

有機分子キラリティ―選択のモデルー対称性の動的な破れ―

SAITO YUKIO, HYUGA HIROYUKI

日本物理学会誌 59 ( 11 ) 781-785 2004.11

Research paper (scientific journal), Joint Work, Accepted

Homochirality Proliferation in Space

SAITO YUKIO, HYUGA HIROYUKI

Journal of the Physical Society of Japan 73 ( 7 ) 1685-1688 2004.07

Research paper (scientific journal), Joint Work

Elastic Lattice Green's Function in Three Dimensions

SAITO YUKIO

Journal of the Physical Society of Japan 73 ( 7 ) 1816-1826 2004.07

Research paper (scientific journal), Single Work

Step wandering due to the structural difference of the upper and the lower terraces

KATOU RYOU, UWAHA MAKIO, SAITO YUKIO

Surface Science 550 ( 1-3 ) 149-165 2004.02

Research paper (scientific journal), Joint Work