Electron and phonon ultrafast dynamic

Electron and phonon ultrafast dynamic in solid exhibiting exotic coupling between charge, spin and structure

Researchers

Brice Arnaud
Rémi Busselez
Marwan Deb
Mathieu Edely
Vincent Juvé
Pascal Ruello
Gwenaëlle Vaudel
Mads Weber
Coll. B. Dkhil, C. Paillard, SPMS Centrale Supelec, V. Garcia, S. Fusil, UMPhy Thales, C. Laulhé LPS-Univ. Paris-Saclay, D. Sando, Univ. Canterbury (New Zealand), H. Bouyanfif LPMC Univ Picardie, L. Bellaiche Univ Arkansas (USA), L. Yedra, Univ. Barcelona (Spain), J. Szade, K. Balin, Institute of Physics, Katowice (Poland).

Ultrafast photostriction in ferroelectrics and multiferroics

The control of the photoinduced coherent acoustic phonon in ferroelectric and multiferroic compounds have been investigated in order to investigate the electron-phonon coupling and the coherent acoustic phonon detection processes. This research has permitted to reveal an original ultrafast optical-light mode conversion in BiFeO3 and LiNbO3. We have shown that it was possible to switch the light polarization from the ordinary to the extraordinary component (and vice-versa) with coherent acoustic phonon and this, up to hundreds of GHz (10ps). This mechanism is based on the modulation of the birefringence of the uniaxial crystal (BiFeO₃, LiNbO₃) induced, through the acousto-optic effect, by the coherent acoustic phonons (left panel in the figure below) [1]. This work has been selected by INP CNRS as a “highlight” [2]. This research is still going on with a focus on new possible way to generate acoustic phonon [3] (transformation of light energy into mechanical energy) with an ANR project UP-DOWN (IMMM leader) that has started in October 2018. The extension of the coupling between coherent acoustic phonons with the magnetic order and in particular with antiferromagnons will be investigated in the ANR SANTA (SPEC-CEA Leader) that has started in October 2018 as well.

Ultrafast light-mode conversion in birefringent ferrolectric materialsUltrafast electron and phonon dynamics in Topological insulators

Related papers

Temporal and spatial tracking of ultrafast light-induced strain and polarization modulation in a ferroelectric thin film, Ruizhe Gu, Vincent Juvé, Claire Laulhé, Houssny Bouyanfif, Gwenaëlle Vaudel, Aurélie Poirier, Brahim Dkhil, Philippe Hollander, Charles Paillard, Mads C Weber, Daniel Sando, Stéphane Fusil, Vincent Garcia, Pascal Ruello, Science Advances 9 (46), eadi1160 (2023)
Optical absorption by design in a ferroelectric: co-doping in BaTiO 3
S Hao, M Yao, G Vitali-Derrien, P Gemeiner, M Otoničar, P Ruello, Housnny Bouyanfif, Pierre-Eymeric Janolin, Brahim Dkhil, Charles Paillard
Journal of Materials Chemistry C 10 (1), 227-234 (2022)
Nonthermal Transport of Energy Driven by Photoexcited Carriers in Switchable Solid States of R Gu, T Perrault, V Juvé, G Vaudel, M Weis, A Bulou, N Chigarev, A Levchuk, S Raetz, VE Gusev, Z Cheng, H Bhaskaran, P Ruello
Physical Review Applied 16 (1), 014055 (2021)
Ultrafast light-induced shear strain probed by time-resolved x-ray diffraction: Multiferroic as a case study
V Juvé, R Gu, S Gable, T Maroutian, G Vaudel, S Matzen, N Chigarev, Samuel Raetz, VE Gusev, M Viret, A Jarnac, C Laulhé, AA Maznev, B Dkhil, Pascal Ruello
Physical Review B 102 (22), 220303 (2020)
Magnetoelastic and magnetoelectric couplings across the antiferromagnetic transition in multiferroic
M Lejman, C Paillard, V Juvé, G Vaudel, N Guiblin, L Bellaiche, M Viret, Vitalyi E Gusev, Brahim Dkhil, Pascal Ruello
Physical Review B 99 (10), 104103 (2019)
Evaluation of the Structural Phase Transition in Multiferroic (Bi1−x Prx)(Fe0.95 Mn0.05)O3 Thin Films by A Multi-Technique Approach Including Picosecond Laser Ultrasonics
S Raetz, A Lomonosov, S Avanesyan, N Chigarev, E de Lima Savi, Alain Bulou, Nicolas Delorme, Zheng Wen, Qiao Jin, Maju Kuriakose, Anthony Rousseau, Gwenaëlle Vaudel, Pascal Ruello, Di Wu, Vitalyi Gusev
Applied Sciences 9 (4), 736 (2019)

Ultrafast acousto-optic mode conversion in optically birefringent ferroelectrics, Mariusz Lejman, Gwenaelle Vaudel, Ingrid C Infante, Ievgeniia Chaban, Thomas Pezeril, Mathieu Edely, Guillaume F Nataf, Mael Guennou, Jens Kreisel, Vitalyi E Gusev, Brahim Dkhil, Pascal Ruello, Nature comm. 7, 12345 (2016)

http://www.cnrs.fr/inp/spip.php?article4895

Photothermal optomechanics, P Ruello, Nature Photonics 10 (11), 692 (2016).

Projects

ANR THz-MUFINS (ANR-21-CE42-0030)
Lmac Région Pays de la Loire (Ferrotransducteur 2015-2019)
ANR UP-DOWN 2018-2021

Ultrafast electron and phonon dynamics in topological insulators

In this work we have investigated ultrathin films of topological insulator (4-15nm). We have first studied the influence of the substrate and the microstructure (single versus polycrystalline structure on the femtosecond pulse-induced electron and phonon dynamics. While the optical phonons (zero group velocity) have frequency and damping dynamics nearly unaffected, the acoustic phonon signature (propagating wave) is clearly different revealing the importance of acoustic phonon scattering on grains boundaries and at interface between the nanometric film and the substrate [1]. In a second study, we have in particular measured the dynamic of hot carriers in Bi₂Te₃ compound and have shown the existence of a strong quantum confinement appearing for thickness as thin as 5-6nm. A dramatic enhancement of the hot carriers relaxation is observed (right panel in the figure above). Such quantum confinement is also revealed in a thickness dependence of the process of generation of coherent acoustic phonons and in the anomalous damping of a Raman active mode A1g mode, together with a slight A1g mode softening. These phenomena evidence a drastic evolution of the electron-phonon coupling in a highly confined system. We have proposed with a simple model, that the band gap increases with decreasing the thickness is an indication of the increase of the electron-longitudinal acoustic phonon deformation potential. A more advanced theoretical work is now required to extract a more precise microscopic picture. Nevertheless, these experimental results are important to tailor the proper thickness of such material for future integration in more complex devices where for example spin-to-charge conversion will be investigated.