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Contribution of electronic excitation to the structural evolution of ultrafast laser-irradiated tungsten nanofilms

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. Green open access

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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.

Type: Article
Title: Contribution of electronic excitation to the structural evolution of ultrafast laser-irradiated tungsten nanofilms
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.93.104105
Publisher version: http://dx.doi.org/10.1103/PhysRevB.93.104105
Language: English
Additional information: Copyright © 2016 American Physical Society. The published version of the article can be found on the journal's website at http://dx.doi.org/10.1103/PhysRevB.93.104105
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1493303
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