• Letter

Nanometric phonon spectroscopy for diamond and cubic boron nitride

Jun Kikkawa, Takashi Taniguchi, and Koji Kimoto
Phys. Rev. B 104, L201402 – Published 5 November 2021
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Abstract

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 Γ 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 105nm2 for both crystals.

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  • Received 6 August 2021
  • Revised 11 October 2021
  • Accepted 21 October 2021

DOI:https://doi.org/10.1103/PhysRevB.104.L201402

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Jun Kikkawa1,2,*, Takashi Taniguchi3, and Koji Kimoto1

  • 1Research Center for Advanced Measurement and Characterization, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
  • 2JST, PRESTO, 4-1-8 Honcho, Kawaguchi 332-0012, Japan
  • 3International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan

  • *kikkawa.jun@nims.go.jp

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Issue

Vol. 104, Iss. 20 — 15 November 2021

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