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

Abstract

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-${}^{10}$BAs to nearly pure c-${}^{11}$BAs. 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.

16 pages, 6 figures, "submitted to Physical Review Materials"

References in corpus (1)

• Phonon-Phonon Interactions in Strongly Bonded Solids: Selection Rules and Higher-Order Processes

Cited by in corpus (3)

• Strong Temperature Dependence of Thermal Conductivity in High-Purity Cubic Boron Arsenide
• Exceptional Optical Phonon Coherence in Enriched Cubic Boron Arsenide via Suppression of Three-Phonon Scattering
• Nonperturbative isotope effect on light-matter interaction in boron arsenide