Effect of 10B isotope and vacancy defects on the phonon modes of two-dimensional hexagonal boron nitride

Md Sherajul Islam, Khalid N. Anindya, Ashraful G. Bhuiyan, Satoru Tanaka, Takayuki Makino, Akihiro Hashimoto

Research output: Contribution to journalArticle

Abstract

We report the details of the effects of the 10B isotope and those of B and N vacancies combined with the isotope on the phonon modes of two-dimensional hexagonal boron nitride (h-BN). The phonon density of states and localization problems are solved using the forced vibrational method, which is suitable for an intricate and disordered system. We observe an upward shift of Raman-active E2g-mode optical phonons (32 cm-1) for a 100% 10B isotope, which matches well with the experiment and simple harmonic oscillator model. However, a downward shift of E2g-mode phonons is observed for B or N vacancies and the combination of the isotope and vacancy-type disordered BN. Strong localized eigenmodes are found for all types of defects, and a typical localization length is on the order of ∼7 nm for naturally occurring BN samples. These results are very important for understanding the heat dissipation and electron transport properties of BN-based nanoelectronics.

Original languageEnglish
Article number02CB04
JournalJapanese Journal of Applied Physics
Volume57
Issue number2
DOIs
Publication statusPublished - Feb 2018

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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