Fig. 3: PSF on-axis EELS measurements and calculations.
From: Atomic-scale visualization of defect-induced localized vibrations in GaN
a EELS data extracted from the PSF (red) and bulk GaN (blue), the extracted range is shown in Supplementary Fig. 1d. b Calculated phonon spectra extracted from the PSF (red) and bulk GaN (blue). c Visualization of the atomic vibrations of two primary LDMs, a typical CBM and a typical FEM around the PSF. The upper figure shows the calculated vibrational eigenvectors. The arrows are the real parts of the eigenvectors showing a snapshot of the vibration amplitudes of the atoms. For FEM, the figure focuses on the main vibrations in the [0001] zone axis, overlooking the minor vibrations within the plane. Details about vibrations in [0001] and \([10\bar{1}0]\) zone axis are available in Supplementary Movies 1–10. The phonon energies around these calculated defect modes are shown in the red (LDM1 and LDM2), blue (CBM) and yellow (FEM) shaded regions of (b). The figures below are the corresponding experimental phonon intensity maps with the energy ranges shown in the red (LDM1 and LDM2), blue (CBM) and yellow (FEM) shaded regions of (a) and the HAADF-STEM images within the same areas.
