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- W2341387697 abstract "Precise manipulation and control of coherent lattice oscillations via nanostructuring and phonon-wave interference has the potential to significantly impact a broad array of technologies and research areas. Resolving the dynamics of individual phonons in defect-laden materials presents an enormous challenge, however, owing to the interdependent nanoscale and ultrafast spatiotemporal scales. Here we report direct, real-space imaging of the emergence and evolution of acoustic phonons at individual defects in crystalline WSe2 and Ge. Via bright-field imaging with an ultrafast electron microscope, we are able to image the sub-picosecond nucleation and the launch of wavefronts at step edges and resolve dispersion behaviours during propagation and scattering. We discover that the appearance of speed-of-sound (for example, 6 nm ps(-1)) wavefronts are influenced by spatially varying nanoscale strain fields, taking on the appearance of static bend contours during propagation. These observations provide unprecedented insight into the roles played by individual atomic and nanoscale features on acoustic-phonon dynamics." @default.
- W2341387697 created "2016-06-24" @default.
- W2341387697 creator A5037559026 @default.
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- W2341387697 date "2016-04-15" @default.
- W2341387697 modified "2023-10-13" @default.
- W2341387697 title "Femtosecond electron imaging of defect-modulated phonon dynamics" @default.
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- W2341387697 doi "https://doi.org/10.1038/ncomms11230" @default.
- W2341387697 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4835536" @default.
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