Fig. 2 Interface phonon measurement at atomic scale (IMAGE)
Caption
a, Calculated phonon dispersion for bulk cBN (green) and diamond (blue). b, Measured EELS line profile across the interface. The origin of the horizontal axis is at the interface. Blue and white arrows are guides to the eye that mark the intensity decrease of cBN LO phonon and the energy shift of the diamond optical phonon. c, Calculated phonon DOS projected onto atom layers. d, Calculated EELS scattering cross section. e, EEL spectra acquired in cBN (green), in diamond (blue), and at the interface (red). The black curve with gradient filling is the interface component that cannot be expressed as a linear combination of two bulk spectra. f, Corresponding calculation results. g, Energy-filtered EELS maps. Overlaid lines are averaged intensity profiles, whose contrast has been adjusted for clarity. Small inset bars at the top of each map are calculated maps. Energy integration windows are indicated by numbers (in meV) at the top-left corner of each map, and are also shaded in e. In all colormaps, the lower color limit is fixed to zero.
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School of Physics, Peking University
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