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

Akash Rai, Sheng Li, Hanlin Wu, Bing Lv, and David G. Cahill
Phys. Rev. Materials 5, 013603 – Published 19 January 2021

Abstract

Boron arsenide (cBAs) 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 cBAs10 to nearly pure cBAs11. 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.

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  • Received 10 August 2020
  • Accepted 22 December 2020

DOI:https://doi.org/10.1103/PhysRevMaterials.5.013603

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Akash Rai1, Sheng Li2, Hanlin Wu2, Bing Lv2, and David G. Cahill1

  • 1Department of Materials Science and Engineering and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
  • 2Department of Physics, University of Texas at Dallas, Richardson, Texas 75080, USA

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Issue

Vol. 5, Iss. 1 — January 2021

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