Article Large Elastic Anisotropy in Two-dimensional Layered GaS and GaSe Modulated by Copper Intercalation

Daniel Ramesh Paulo-Wach (UC Berkeley) ; Ethan Chen (University of California Davis,) ; Masaru Nakamura SAMURAI ORCID (Research Center for Electronic and Optical Materials/Optical Materials Field/Optical Single Crystals Group, National Institute for Materials Science) ; Oscar D. Dubon (UC Berkeley) ; Kristie J. Koski (University of California Davis,)

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Daniel Ramesh Paulo-Wach, Ethan Chen, Masaru Nakamura, Oscar D. Dubon, Kristie J. Koski. Large Elastic Anisotropy in Two-dimensional Layered GaS and GaSe Modulated by Copper Intercalation. APPLIED PHYSICS LETTERS. 2025, 127 (26), . https://doi.org/10.1063/5.0300066

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(abstract)

Brillouin scattering of bulk layered gallium sulfide (GaS) and gallium selenide (GaSe) grown using the Bridgman method were measured both as pristine materials and intercalated with copper and silver. The soundvelocities, refractive index, and four of the five independent elastic stiffnesses (cij) were determined. Values of the c11 elastic stiffness in thin crystals are higher than in previous measurements, bringing the elastic anisotropy (c11/c33) into a range typical of other layered materials. Copper intercalation showed a larger effect on acoustic phonons in GaS than GaSe.

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    This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Daniel Paulo-Wach, Ethan Chen, Masaru Nakamura, Oscar D. Dubon, Kristie J. Koski; Large elastic anisotropy in Brillouin scattering of copper-intercalated GaS and GaSe. Appl. Phys. Lett. 29 December 2025; 127 (26): 262202 and may be found at https://doi.org/10.1063/5.0300066.

Keyword: elastic stiffness, Brillouin scattering, GaS, GaSe

Date published: 2025-12-29

Publisher: AIP Publishing

Journal:

  • APPLIED PHYSICS LETTERS (ISSN: 00036951) vol. 127 issue. 26

Funding:

  • National Science Foundation 2202472
  • National Science Foundation 2500503
  • Japan Society for the Promotion of Science 24K08274

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6099

First published URL: https://doi.org/10.1063/5.0300066

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Updated at: 2026-01-05 15:47:37 +0900

Published on MDR: 2026-01-06 08:19:17 +0900

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