Generation and Detection of Acoustic Phonons in nanopatterned Ferroelectrics
| Autor: | Gu, Ruizhe, Vaudel, Gwenäelle, Juvé, Vincent, Dkhil, Brahim, Fusil, Stéphane, Carretero, Cécile, Garcia, Vincent, Carcan, Benjamin, Bouyanfif, Houssny, Goussev, Vitali, Ruello, Pascal |
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| Přispěvatelé: | Institut des Molécules et Matériaux du Mans (IMMM), Le Mans Université (UM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Shenyang National Laboratory for Materials Science (SYNL), Institute of Metal Research [Chinese Academy of Sciences] (IMR), Chinese Academy of Sciences [Beijing] (CAS)-Chinese Academy of Sciences [Beijing] (CAS), Unité mixte de physique CNRS/Thales (UMPhy CNRS/THALES), THALES-Centre National de la Recherche Scientifique (CNRS), Mark Wainwright Analytical Centre [Sydney] (UNSW ), University of New South Wales [Sydney] (UNSW) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Ferroelectrics
[PHYS.MECA.VIBR]Physics [physics]/Mechanics [physics]/Vibrations [physics.class-ph] Condensed Matter::Materials Science Superlattices Acoustic phonons Condensed Matter::Mesoscopic Systems and Quantum Hall Effect [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph] |
| Zdroj: | Forum Acusticum Forum Acusticum, Dec 2020, Lyon, France. pp.3041-3041, ⟨10.48465/fa.2020.0341⟩ |
| DOI: | 10.48465/fa.2020.0341⟩ |
| Popis: | International audience; 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 \mathrmBiFeO₃/LaFeO₃ superlattices. In this case, the light can directly interact with ferroelectric \mathrmBiFeO₃ instead of interacting with metallic oxide \mathrmSrRuO₃ only. Furthermore, we also investigate the GHz acoustic phonon generation in \mathrmBiFeO₃ 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. |
| Databáze: | OpenAIRE |
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