Journal
PHYSICAL REVIEW B
Volume 104, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.L201402
Keywords
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Funding
- JST, PRESTO [JPMJPR18I4]
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This study demonstrates nanometric measurements of phonon dispersions and mapping using a heterojunction of diamond and c-BN single crystals, with high spatial/energy resolution instruments and techniques. The results show that the total scattering cross sections of optical and acoustic-phonon modes in diamond and c-BN are on the order of 10-5 nm2.
Local phonon properties near heterointerfaces or lattice defects are key for controlling various material properties such as thermal conductivity and thermoelectricity. However, high-spatial-resolution measurements of bulk phonons have hardly been established, even in typical nonpolar and polar bulk materials such as diamond and cubic boron nitride (c-BN), respectively. Here, we demonstrate nanometric measurements of phonon dispersions and mapping using a heterojunction of diamond and c-BN single crystals. To achieve high spatial/energy resolution, we use a monochromated (-20-30 meV) electron nanoprobe, a high-sensitivity scintillator for counting inelastically scattered electrons, and the Richardson-Lucy deconvolution. The diamond phonon dispersion is first measured under a large-scattering-vector condition, particularly for the I' point. Differential scattering cross sections of optical and acoustic-phonon modes in diamond and c-BN are also measured, and the totals of their modes are on the order of 10-5 nm2 for both crystals.
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