Murphy, ST; Giret, Y; Daraszewicz, SL; Lim, AC; Shluger, AL; Tanimura, K; Duffy, DM; (2016) Contribution of electronic excitation to the structural evolution of ultrafast laser-irradiated tungsten nanofilms. Physical Review B , 93 (10) , Article 104105. 10.1103/PhysRevB.93.104105.

Preview

Text PhysRevB.93.104105_murphy_2016.pdf - Published Version Download (2MB) | Preview

Abstract

The redistribution of the electron density in a material during laser irradiation can have a significant impact on its structural dynamics. This electronic excitation can be incorporated into two temperature molecular dynamics (2T-MD) simulations through the use of electronic temperature dependent potentials. Here, we study the structural dynamics of laser irradiated tungsten nanofilms using 2T-MD simulations with an electronic temperature dependent potential and compare the results to equivalent simulations that employ a ground-state interatomic potential. Electronic excitation leads to an expansion of the crystal and a decrease in the melting point of tungsten. During laser irradiation these factors ensure that the threshold fluences to the different melting regimes are reduced. Furthermore, both heterogenous and homogeneous melting are predicted to occur more rapidly due to excitation and oscillations in the film thickness will be accentuated.

Download activity - last month

Export as CSVXMLJSON

Download activity - last 12 months

Export as CSVXMLJSON

Downloads by country - last 12 months

Export as JSONXMLCSV

Archive Staff Only

View Item