Direct observation of strong momentum-dependent electron-phonon coupling in a metal

被引：6

作者：

Mo, Mianzhen ^{[1
]}

Tamm, Artur ^{[2
,3
]}

Metsanurk, Erki ^{[4
]}

Chen, Zhijiang ^{[1
]}

Wang, Ling ^{[1
]}

Frost, Mungo ^{[1
]}

Hartley, Nicholas J. ^{[1
]}

Ji, Fuhao ^{[1
]}

Pandolfi, Silvia ^{[1
,8
]}

Reid, Alexander H. ^{[1
]}

Sun, Peihao ^{[5
]}

Shen, Xiaozhe ^{[1
]}

Wang, Yongqiang ^{[6
,7
]}

Wang, Xijie ^{[1
]}

Glenzer, Siegfried ^{[1
]}

Correa, Alfredo A. ^{[3
]}

机构：

[1] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

[2] Univ Tartu, Inst Phys, Lab Phys Ion Crystals, W Ostwaldi tn 1, EE-50411 Tartu, Estonia

[3] Lawrence Livermore Natl Lab, Phys Div, Quantum Simulat Grp, Livermore, CA 94550 USA

[4] Uppsala Univ, Dept Phys & Astron, Box 516, S-75120 Uppsala, Sweden

[5] Univ Padua, Dept Phys & Astron, I-835131 Padua, Italy

[6] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA

[7] Los Alamos Natl Lab, Mat Sci & Technol Div, Los Alamos, NM 87545 USA

[8] Sorbonne Univ, CNRS, UMR 7590, IMPMc, F-75005 Paris, France

来源：

SCIENCE ADVANCES | 2024年 / 10卷 / 11期

关键词：

SCATTERING;

D O I：

10.1126/sciadv.adk9051

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Phonon scattering in metals is one of the most fundamental processes in materials science. However, understanding such processes has remained challenging and requires detailed information on interactions between phonons and electrons. We use an ultrafast electron diffuse scattering technique to resolve the nonequilibrium phonon dynamics in femtosecond-laser-excited tungsten in both time and momentum. We determine transient populations of phonon modes which show strong momentum dependence initiated by electron-phonon coupling. For phonons near Brillouin zone border, we observe a transient rise in their population on a timescale of approximately 1 picosecond driven by the strong electron-phonon coupling, followed by a slow decay on a timescale of approximately 8 picosecond governed by the weaker phonon-phonon relaxation process. We find that the exceptional harmonicity of tungsten is needed for isolating the two processes, resulting in long-lived nonequilibrium phonons in a pure metal. Our finding highlights that electron-phonon scattering can be the determinant factor in the phonon thermal transport of metals.

引用

页数：10