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Proceedings Paper

Light-activated gigahertz ferroelectric domain dynamics (Conference Presentation)
Author(s): Venkatraman Gopalan; Hirofumi Akamatsu; Yakun Yuan; Vladimir Stoica; Gregory Stone; Tiannan Yang; Zijian Hong; Shiming Lei; Yi Zhu; John Freeland; Long-Qing Chen; Haidan Wen
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Paper Abstract

Using time- and spatially-resolved hard X-ray diffraction microscopy, the striking structural and electrical dynamics upon optical excitation of a single crystal of BaTiO3 are simultaneously captured on sub-nanoseconds and nanoscale within individual ferroelectric domains and across walls. A large emergent photo-induced electric field of up to 20 million volts per meter is discovered in a surface layer of the crystal, which then drives polarization and lattice dynamics that are dramatically dis- tinct in a surface layer versus bulk regions. A dynamical phase-field modeling (DPFM) method is developed that reveals the microscopic origin of these dynamics, leading to GHz polarization and elastic waves travelling in the crystal with sonic speeds and spatially varying frequencies. The ad- vance of spatiotemporal imaging and dynamical modeling tools open opportunities of disentangling ultrafast processes in complex mesoscale structures such as ferroelectric domains

Paper Details

Date Published: 17 September 2018
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Proc. SPIE 10753, Ultrafast Nonlinear Imaging and Spectroscopy VI, 107530A (17 September 2018); doi: 10.1117/12.2322964
Show Author Affiliations
Venkatraman Gopalan, The Pennsylvania State Univ. (United States)
Hirofumi Akamatsu, Kyushu Univ. (Japan)
Yakun Yuan, The Pennsylvania State Univ. (United States)
Vladimir Stoica, The Pennsylvania State Univ. (United States)
Gregory Stone, The Pennsylvania State Univ. (United States)
Tiannan Yang, The Pennsylvania State Univ. (United States)
Zijian Hong, The Pennsylvania State Univ. (United States)
Shiming Lei, The Pennsylvania State Univ. (United States)
Yi Zhu, Argonne National Lab. (United States)
John Freeland, Argonne National Lab. (United States)
Long-Qing Chen, The Pennsylvania State Univ. (United States)
Haidan Wen, Argonne National Lab. (United States)


Published in SPIE Proceedings Vol. 10753:
Ultrafast Nonlinear Imaging and Spectroscopy VI
Zhiwen Liu; Demetri Psaltis; Kebin Shi, Editor(s)

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