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).
个性服务
查看访问统计
相关权益政策
暂无数据
收藏/分享
所有评论 (0)
暂无评论
 

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。


©版权所有 ©2017 CSpace - Powered by CSpace