期刊
PHYSICAL REVIEW B
卷 101, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.101.180102
关键词
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资金
- French National Research Agency [SANTA-ANR-18-CE24-0018-03]
- International laboratory LIA IM-LED
- National Science Center [2016/21/B/ST5/0253]
- Ecole Doctorale 3MPL (Matiere, Molecules et Materiaux, Pays de la Loire France)
- GENCI-CINES [095096]
We report the generation of coherent acoustic phonons in materials with terahertz ultrashort pulses. This is demonstrated in metals and topological insulators by exciting an acoustic eigenmode in nanometric-sized thin films. The efficiency of the coupling is quadratic in the terahertz electric field strength within the range of investigation. Owing to a quantitative comparison between terahertz and near-infrared ultrashort pulse excitations, we show that the process of acoustic phonon generation by terahertz radiation is mainly driven by thermoelastic stress. While for the near-infrared light excitation the lattice temperature increase comes from a rapid energy transfer from the hot carriers to the phonon bath during carrier intraband relaxation, the thermoelastic stress induced by the terahertz electric field is linked to the scattering of the accelerated electrons leading to an ultrafast Joule effect.
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