Ultrafast destructuring of laser-irradiated tungsten: Thermal or nonthermal process | |
Zhang, H.1; Li, C.1,2; Bevillon, E.1; Cheng, G.2; Colombier, J. P.1; Stoian, R.1 | |
刊名 | physical review b |
2016-12-16 | |
卷号 | 94期号:22 |
ISSN号 | 2469-9950 |
产权排序 | 2 |
英文摘要 | the time needed for metals to respond structurally to electronic excitation is usually considered to be set by picosecond-long electron-phonon coupling, hence limiting the rapid achievement of structural phase changes. via time-resolved ellipsometry, we show that fs laser excitation of tungsten determines unexpectedly fast optical and structural transformations, almost on the time scale of the laser pulse, with sub-ps destructuring of matter. if at low energies, below the damage threshold, fermi redistribution within the d-band pseudogap populates localized states that screen ions, in ablative ranges, at electronic energies above 4 ev, a charge deficit appears on bonding orbitals generating bond-softening and ionic repulsion in spite of the metallic environment. along pressure gradients, this rapidly destabilizes the structure. sub-ps ablation occurs, challenging thermally driven scenarios of phonon activation. first-principles and hydrodynamic models show that ablation interrelates nonclassical charge distortions, electronic stress, and classical electron-phonon dynamics, with the coexistence of thermal and nonthermal effects on scales believed to be prohibitive for the former. |
学科主题 | physics, condensed matter |
WOS标题词 | science & technology ; physical sciences |
类目[WOS] | physics, condensed matter |
研究领域[WOS] | physics |
关键词[WOS] | excitation ; dynamics |
收录类别 | SCI |
语种 | 英语 |
WOS记录号 | WOS:000390251300002 |
内容类型 | 期刊论文 |
源URL | [http://ir.opt.ac.cn/handle/181661/28591] |
专题 | 西安光学精密机械研究所_瞬态光学技术国家重点实验室 |
作者单位 | 1.Univ Lyon, Lab Hubert Curien, CNRS, UMR 5516, F-42000 St Etienne, France 2.Chinese Acad Sci, State Key Lab Transient Opt & Photon, XIOPM, Xian 710119, Peoples R China |
推荐引用方式 GB/T 7714 | Zhang, H.,Li, C.,Bevillon, E.,et al. Ultrafast destructuring of laser-irradiated tungsten: Thermal or nonthermal process[J]. physical review b,2016,94(22). |
APA | Zhang, H.,Li, C.,Bevillon, E.,Cheng, G.,Colombier, J. P.,&Stoian, R..(2016).Ultrafast destructuring of laser-irradiated tungsten: Thermal or nonthermal process.physical review b,94(22). |
MLA | Zhang, H.,et al."Ultrafast destructuring of laser-irradiated tungsten: Thermal or nonthermal process".physical review b 94.22(2016). |
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