Generation and Detection of Acoustic Phonons in nanopatterned Ferroelectrics - Archive ouverte HAL
Communication Dans Un Congrès Année : 2020

Generation and Detection of Acoustic Phonons in nanopatterned Ferroelectrics

Résumé

The superlattices(SLs), such as GaAs/AlAs, have been extensively studied and developed as a source of THz acoustic phonons. Due to the periodic modulation of mechanical properties, the dispersion of acoustic branches in center Brillouin-Zone is indeed folded which offers the opportunity to directly excite coherent THz acoustic phonons with femtosecond light pulses. Meanwhile, perovskite oxides caught attention because of their coupled ferroelectric and magnetic orders with the phonon subsystem, which reveal peculiar mechanisms of GHz phonon generation. Coupling the superlattice geometry with ferroelectric properties is then a natural exciting direction to explore new phonon photogeneration processes. THz coherent acoustic phonon generation in PZT/SRO superlattices has been already demonstrated. In this communication, we will show and discuss, with femtoseceond pump-probe setup, how we can generate THz coherent acoustic phonons in ferroelectric <latex>\mathrmBiFeO₃/LaFeO₃</latex> superlattices. In this case, the light can directly interact with ferroelectric <latex>\mathrmBiFeO₃</latex> instead of interacting with metallic oxide <latex>\mathrmSrRuO₃</latex> only. Furthermore, we also investigate the GHz acoustic phonon generation in <latex>\mathrmBiFeO₃</latex> thin films harboring pristine periodic domains and well defined "in plane" polarization. We explore in the latter case the generation of shear acoustic phonons. All these results bring new insights on the crucial role of ferroelectric domain nano-structuration for controlling the coherent acoustic phonon spectrum.
Fichier non déposé

Dates et versions

hal-03240243 , version 1 (12-06-2021)

Identifiants

Citer

Ruizhe Gu, Gwenäelle G. Vaudel, Vincent Juvé, Brahim Dkhil, Stéphane Fusil, et al.. Generation and Detection of Acoustic Phonons in nanopatterned Ferroelectrics. Forum Acusticum, Dec 2020, Lyon, France. pp.3041-3041, ⟨10.48465/fa.2020.0341⟩. ⟨hal-03240243⟩
89 Consultations
0 Téléchargements

Altmetric

Partager

More