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Electron–Phonon Coupling and Nonthermal Effects in Gold Nano-Objects at High Electronic Temperatures
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SYSNO ASEP 0579465 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Electron–Phonon Coupling and Nonthermal Effects in Gold Nano-Objects at High Electronic Temperatures Author(s) Medvedev, Nikita (UFP-V) ORCID
Milov, I. (NL)Number of authors 2 Article number 4883 Source Title Materials. - : MDPI
Roč. 15, č. 14 (2022)Number of pages 11 s. Language eng - English Country CH - Switzerland Keywords Boltzmann collision integrals ; electron–phonon coupling ; nanoparticle ; nonthermal melting ; tight-binding molecular dynamics ; ultrathin layer ; xtant Subject RIV BH - Optics, Masers, Lasers OECD category Optics (including laser optics and quantum optics) Method of publishing Open access Institutional support UFP-V - RVO:61389021 UT WOS 000831367000001 EID SCOPUS 85137261237 DOI 10.3390/ma15144883 Annotation 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. Additionally, nano-objects under ultrafast energy deposition experience nonthermal damage due to expansion caused by electronic pressure, in contrast to bulk metal. Nano-object ultrafast expansion leads to the ablation/emission of atoms and disorders the inside of the remaining parts. These nonthermal atomic expansion and melting are significantly faster than electron–phonon coupling, forming a dominant effect in nano-sized gold. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2024 Electronic address https://www.mdpi.com/1996-1944/15/14/4883
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