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

https://mdr.nims.go.jp/datasets/e1f547d3-7519-4083-a5ca-339dae23e2b6

## File

- [GaS_Brillouin_Resbmission.pdf](https://mdr.nims.go.jp/filesets/b0ed6e77-2512-4980-840d-c933b4a1dab8/download) ([Detail](https://mdr.nims.go.jp/filesets/b0ed6e77-2512-4980-840d-c933b4a1dab8.md))

## Id

e1f547d3-7519-4083-a5ca-339dae23e2b6

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-12-24T10:36:07.928473Z

## Updated at

2026-01-05T06:47:37.944269Z

## Published at

2026-01-05T23:19:17.148759Z

## Doi

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

## First published url

https://doi.org/10.1063/5.0300066

## Date published

2025-12-29

## Recorded date published

2025-12-29

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Large Elastic Anisotropy in Two-dimensional Layered GaS and GaSe Modulated
    by Copper Intercalation
  title_type: original
  lang: en

## Description

- description: 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.
  description_type: abstract
  lang: eng

## Creator

- name: Daniel Ramesh Paulo-Wach
  role: author
  organization: UC Berkeley
- name: Ethan Chen
  role: author
  organization: University of California Davis,
- name: Masaru Nakamura
  role: author
  orcid: https://orcid.org/0000-0001-9729-847X
  organization: National Institute for Materials Science
  department: Research Center for Electronic and Optical Materials/Optical Materials
    Field/Optical Single Crystals Group
- name: Oscar D. Dubon
  role: author
  organization: UC Berkeley
- name: Kristie J. Koski
  role: author
  organization: University of California Davis,

## Contact agent



## Publisher

organization: AIP Publishing

## Managing organization



## Keyword

- subject: elastic stiffness
  schema: not_defined
- subject: Brillouin scattering
  schema: not_defined
- subject: GaS
  schema: not_defined
- subject: GaSe
  schema: not_defined

## Rights

- description: '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.'
  identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: APPLIED PHYSICS LETTERS
  issn: '00036951'
  volume: '127'
  issue: '26'

## Conference



## Related item



## Funding

- identifier: '2202472'
  funder_name: National Science Foundation
- identifier: '2500503'
  funder_name: National Science Foundation
- identifier: 24K08274
  funder_name: Japan Society for the Promotion of Science

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## Chemical composition



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## Fileset

- id: b0ed6e77-2512-4980-840d-c933b4a1dab8
  filename: GaS_Brillouin_Resbmission.pdf
  content_type: application/pdf
  size: 2143951
  md5: 4a39acbd8407a6ac9e0f879b0a76f2f6

## Thumbnail

fileset_id: b0ed6e77-2512-4980-840d-c933b4a1dab8
filename: GaS_Brillouin_Resbmission.pdf