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2021 Shared Facilities: Single-Defect Phonons Imaged by Electron Microscopy

  • The new Nion HERMES 200 is an aberration corrected, monochromated scanning transmission electron microscope (STEM) equipped with angle-resolved electron energy-loss spectroscopy (EELS), which is the first at a University Shared Facility.
  • Based on the new capabilities of this instrument, the UCI MRSEC team (Pan and Wu) demonstrated, for the first time, exotic atomic vibrations localized at a single stacking fault in cubic SiC, showing by an energy shift of 3.8 meVand an obvious intensity modulation of the acoustic phonon mode.

UCI MRSEC 2011967 Shared Facilities Pan Electron Microscopy.pptx

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Yan, X., Liu, C., Gadre, C.A. et al. Single-defect phonons imaged by electron microscopy. Nature 589, 65–69 (2021). https://doi.org/10.1038/s41586-020-03049-y

Xiaoqing Pan, Ruqian Wu (University of California, Irvine)