Electron-phonon coupling and nonthermal effects in gold nano-objects at high electronic temperatures

0566967 - FZÚ 2023 RIV CH eng J - Journal Article
Medvedev, Nikita - Milov, I.
Electron-phonon coupling and nonthermal effects in gold nano-objects at high electronic temperatures.
Materials. Roč. 15, č. 14 (2022), č. článku 4883. E-ISSN 1996-1944
R&D Projects: GA MŠMT(CZ) LM2018114; GA MŠMT LTT17015
Research Infrastructure: e-INFRA CZ - 90140
Institutional support: RVO:68378271
Keywords : electron-phonon coupling * nanoparticle * ultrathin layer * nonthermal melting * tight-binding molecular dynamics * Boltzmann collision integrals * XTANT
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 3.4, year: 2022
Method of publishing: Open access

Laser irradiation of metals is widely used in research and applications. In this work, we study how the material geometry affects electron–phonon coupling in nano-sized gold samples: an ultrathin layer, nano-rod, and two types of gold nanoparticles (cubic and octahedral). We use the combined tight-binding molecular dynamics Boltzmann collision integral method implemented within XTANT-3 code to evaluate the coupling parameter in irradiation targets at high electronic temperatures (up to Te~20,000 K). Our results show that the electron–phonon coupling in all objects with the same fcc atomic structure (bulk, layer, rod, cubic and octahedral nanoparticles) is nearly identical at electronic temperatures above Te~7000 K, independently of geometry and dimensionality. At low electronic temperatures, reducing dimensionality reduces the coupling parameter.
Permanent Link: https://hdl.handle.net/11104/0338235