Four-dimensional vibrational spectroscopy for nanoscale mapping of phonon dispersion in BN nanotubes

  title={Four-dimensional vibrational spectroscopy for nanoscale mapping of phonon dispersion in BN nanotubes},
  author={Ruishi Qi and Ning Li and Jinlong Du and Ruo-Chen Shi and Yang Huang and Xiaoxia Yang and Lei Liu and Zhi Xu and Qing Dai and Dapeng Yu and Peng Gao},
  journal={Nature Communications},
Directly mapping local phonon dispersion in individual nanostructures can advance our understanding of their thermal, optical, and mechanical properties. However, this requires high detection sensitivity and combined spatial, energy and momentum resolutions, thus has been elusive. Here, we demonstrate a four-dimensional electron energy loss spectroscopy technique, and present position-dependent phonon dispersion measurements in individual boron nitride nanotubes. By scanning the electron beam… 
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