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Title: Ultrafast terahertz-field-driven ionic response in ferroelectric BaTiO 3

Journal Article · · Physical Review B

The dynamical processes associated with electric field manipulation of the polarization in a ferroelectric remain largely unknown but fundamentally determine the speed and functionality of ferroelectric materials and devices. Here we apply subpicosecond duration, single-cycle terahertz pulses as an ultrafast electric field bias to prototypical BaTiO3 ferroelectric thin films with the atomic-scale response probed by femtosecond x-ray-scattering techniques. We show that electric fields applied perpendicular to the ferroelectric polarization drive large-amplitude displacements of the titanium atoms along the ferroelectric polarization axis, comparable to that of the built-in displacements associated with the intrinsic polarization and incoherent across unit cells. This effect is associated with a dynamic rotation of the ferroelectric polarization switching on and then off on picosecond time scales. These transient polarization modulations are followed by long-lived vibrational heating effects driven by resonant excitation of the ferroelectric soft mode, as reflected in changes in the c-axis tetragonality. The ultrafast structural characterization described here enables a direct comparison with first-principles-based molecular-dynamics simulations, with good agreement obtained.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
DOE Contract Number:
AC02-06CH11357
OSTI ID:
1336252
Journal Information:
Physical Review B, Vol. 94, Issue 18; ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

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Cited By (16)

Probing dynamics in quantum materials with femtosecond X-rays journal June 2018
Enhanced optical-to-THz conversion efficiency of photoconductive antenna using dielectric nano-layer encapsulation journal May 2018
Soft-mode driven polarity reversal in ferroelectrics mapped by ultrafast x-ray diffraction journal March 2018
Terahertz waveform considerations for nonlinearly driving lattice vibrations journal April 2019
Non-thermal fluence threshold for femtosecond pulsed x-ray radiation damage in perovskite complex oxide epitaxial heterostructures journal December 2019
Vibronic (pseudo Jahn-Teller) theory of ferroelectricity: Novel aspects and applications journal November 2018
Sr-induced dipole scatter in Ba x Sr 1 x TiO 3 : Insights from a transferable-bond valence-based interatomic potential journal November 2019
Ultrafast Reversal of the Ferroelectric Polarization journal May 2017
Light-Activated Gigahertz Ferroelectric Domain Dynamics journal February 2018
Electric-Field-Driven Nanosecond Ferroelastic-Domain Switching Dynamics in Epitaxial Pb ( Zr , Ti ) O 3 Film journal November 2019
Ultrafast polarization switching in ferroelectrics journal November 2019
Experimental station Bernina at SwissFEL: condensed matter physics on femtosecond time scales investigated by X-ray diffraction and spectroscopic methods journal April 2019
Scientific instrument Femtosecond X-ray Experiments (FXE): instrumentation and baseline experimental capabilities journal August 2019
Anti-reflection coating design for metallic terahertz meta-materials journal January 2018
Anti-reflection coating design for metallic terahertz meta-materials conference January 2018
Ultrafast polarization switching in ferroelectrics text January 2020

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