Computer Experiments on Soliton Production for Realizing Laboratory Experiments

et al. 2004

phys. stat. sol. (c)

A molecular dynamics computer simulation has been performed for a monatomic, anharmonic, and twodimensional hexagonal crystal. Central forces between the nearest neighbor atoms and anharmonic forces up to the third order are considered. Pulse displacements are applied to the line of atoms at the left end of a rectangular model crystal, in the middle of which two light or heavy mass defects are placed. Phonons or solitons propagating in the crystal and scattered by the defects are observed.

Section: Introductionmentioning

confidence: 62%

“…The snapshots after passing the excitation through the defects are presented. Four cases can be considered after combining cases A and B in (2), and a and b in (1). Phonon case (Fig.…”

Section: Resultsmentioning

confidence: 99%

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Computer simulation of propagation of nonlinear waves interacting with a small number of point mass defects

Ozawa

et al. 2004

phys. stat. sol. (c)

“…It has been found that the atomic excitations are mainly phonons or solitons when the applied input pulse is relatively small or large, respectively. The occurrence of soliton excitation was confirmed by the following findings [2]. The energy of the excitation is sharply concentrated in space, the characteristic feature of the kink-like spatial distribution of atomic displacement can be seen, the propagation velocity of the excitation is higher than those of phonons, and when two excitations collide they pass freely through each other.…”

Section: Introductionmentioning

confidence: 62%

“…Atomic excitations propagating in the crystal can be observed. The study originated with the case of onedimensional (1D) chain crystals [1], and was extended to 2D square and hexagonal crystals, and further to 3D cubic crystals, as cited in our recent article [2]. It has been found that the atomic excitations are mainly phonons or solitons when the applied input pulse is relatively small or large, respectively.…”

Section: Introductionmentioning

confidence: 99%

Computer simulation study on propagation of nonlinear waves through heavily defective crystals

Hiki

et al. 2004

phys. stat. sol. (c)

A molecular dynamics computer simulation has been performed for a monatomic, anharmonic, and twodimensional hexagonal crystal. Central forces between the nearest neighbor atoms and anharmonic forces up to the third order are considered. Pulse displacements are applied to the line of atoms at the left end of a rectangular model crystal, in the right half of which a number of light or heavy mass defects are randomly placed. Phonons or solitons propagating in the crystal and scattered by the defects are observed.

Computer Experiments on Scattering of Atomic Excitations by Defects in Model Crystals

Minato

et al. 2004

Jpn. J. Appl. Phys.

AFM-generated surface modifications are used to fabricate free-standing Si nanostructures. We employ the local electric field of a metal-coated AFM tip which is operated in air to selectively oxidize regions of a H-passivated Si surface. The resulting oxide, ∼ 1-2 nm thick, is used as a mask for deep selective etches of the unoxidized regions of Si. The etched structures reside on a buried oxide layer which is removed to produce free-standing Si wires and cantilevers. Due to the uniformity of the exposure and self-limiting etch processes, these structures are extremely uniform, which is a critical feature for nanometer-scale device applications.