[en] Strain engineering has been extended recently to the picosecond timescales, driving ultrafast metal–insulator phase transitions and the propagation of ultrasonic demagnetization fronts. However, the nonlinear lattice dynamics underpinning interfacial optoelectronic phase switching have not yet been addressed. Here we perform time-resolved all-optical pump-probe experiments to study ultrafast lattice dynamics initiated by impulsive light excitation tuned in resonance with a polar lattice vibration in LaAlO3 single crystals, one of the most widely utilized substrates for oxide electronics. We show that ionic Raman scattering drives coherent rotations of the oxygen octahedra around a high-symmetry crystal axis. By means of DFT calculations we identify the underlying nonlinear phonon–phonon coupling channel. Resonant lattice excitation is also shown to generate longitudinal and transverse acoustic wave packets, enabled by anisotropic optically induced strain. Importantly, shear strain wave packets are found to be generated with high efficiency at the phonon resonance, opening exciting perspectives for ultrafast material control.
Disciplines :
Physics Physics
Author, co-author :
Hortensius, J. R.; Delft University of Technology
Afanasiev, D.; Delft Univeristy of Technology
Sasani, Alireza ; Université de Liège - ULiège > Département de physique > Physique théorique des matériaux
Bousquet, Eric ; Université de Liège - ULiège > Département de physique > Physique théorique des matériaux
Caviglia, A. D.; Delft University of Technology
Language :
English
Title :
Ultrafast strain engineering and coherent structural dynamics from resonantly driven optical phonons in LaAlO3
Publication date :
2020
Journal title :
npj Quantum Materials
eISSN :
2397-4648
Publisher :
Nature Publishing Group, London, United Kingdom
Volume :
5
Pages :
95
Peer reviewed :
Peer Reviewed verified by ORBi
Tags :
Tier-1 supercomputer CÉCI : Consortium des Équipements de Calcul Intensif
Funders :
Consortium des Equipements de Calcul Intensif (CÉCI, grants No. 2.5020.11 and No. 1175545), and Tier-1 supercomputer of the Fédération Wallonie-Bruxelles funded by the Walloon Region (Grant No. 1117545).
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