Effect of isotope disorder on the Raman spectra of cubic boron arsenide

Akash Rai, Sheng Li, Hanlin Wu, Bing Lv, David G. Cahill

Research output: Contribution to journalArticlepeer-review


Boron arsenide (c-BAs) is at the forefront of research on ultrahigh thermal conductivity materials. We present a Raman scattering study of isotopically tailored cubic boron arsenide single crystals for 11 isotopic compositions spanning the range from nearly pure c-BAs10 to nearly pure c-BAs11. Our results provide insights on the effects of strong mass disorder on optical phonons and the appearance of two-mode behavior in the Raman spectra of mixed crystals. Strong isotope disorder also relaxes the one-phonon Raman selection rules, resulting in disorder-activated Raman scattering by acoustic phonons.

Original languageEnglish (US)
Article number013603
JournalPhysical Review Materials
Issue number1
StatePublished - Jan 2021

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)


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