2023/02/13 by Ryo Kobayashi, Kobayashi, Ryo, Tomohito Otobe +1
Engineering · Materials Science · #Diamond and Carbon-based Materials Research #FOS: Physical sciences #Laser Material Processing Techniques #Laser-induced spectroscopy and plasma #Materials Science (cond-mat.mtrl-sci)
paper · pdf · doi:10.48550/arxiv.2302.06045
openalex publication_date 2023/02/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
The molecular dynamics (MD) approach is an effective tool for investigating atomistic dynamical phenomena at the surface of materials under strong laser irradiation. Therefore, numerous laser ablation MD simulation studies have been conducted to date. However, in most MD studies, non-thermal and entropic effects via hot electrons on interatomic interactions that could cause significant differences in the simulation results are not considered. In this study, the MD simulation of the laser ablation of the Si surface was conducted using an interatomic potential whose parameters depended on the electronic temperature. Moreover, the results obtained with and without electronic temperature dependence were compared. The electronic temperature dependence resulted in an approximately four-times-greater compressive pressure near the surface, enhanced evaporation of atomic or smaller clusters, and slightly longer melt depth. Compared to the strong compressive pressure near the surface, the tensile pressure, which originated from the reflection of the compressive pressure wave at the surface, and ablation phenomena were less dependent on the electronic temperature.