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Femtosecond-resolved imaging of a single-particle phase transition in energy-filtered ultrafast electron microscopy

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Title
Femtosecond-resolved imaging of a single-particle phase transition in energy-filtered ultrafast electron microscopy
Author(s)
Ye-Jin Kim; Hak-Won Nho; Ji, Shaozheng; Lee, Hyejin; Ko, Hyunhyub; Weissenrieder, Jonas; Oh-Hoon Kwon
Publication Date
2023-01
Journal
SCIENCE ADVANCES, v.9, no.4
Publisher
AMER ASSOC ADVANCEMENT SCIENCE
Abstract
Using an energy filter in transmission electron microscopy has enabled elemental mapping at the atomic scale and improved the precision of structural determination by gating inelastic and elastic imaging electrons, respec-tively. Here, we use an energy filter in ultrafast electron microscopy to enhance the temporal resolution toward the domain of atomic motion. Visualizing transient structures with femtosecond temporal precision was achieved by selecting imaging electrons in a narrow energy distribution from dense chirped photoelectron packets with broad longitudinal momentum distributions and thus typically exhibiting picosecond durations. In this study, the heterogeneous ultrafast phase transitions of vanadium dioxide (VO2) nanoparticles, a repre-sentative strongly correlated system, were filmed and attributed to the emergence of a transient, low-symmetry metallic phase caused by different local strains. Our approach enables electron microscopy to access the time scale of elementary nuclear motion to visualize the onset of the structural dynamics of matter at the nanoscale.
URI
https://pr.ibs.re.kr/handle/8788114/13566
DOI
10.1126/sciadv.add5375
ISSN
2375-2548
Appears in Collections:
Center for Soft and Living Matter(첨단연성물질 연구단) > 1. Journal Papers (저널논문)
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