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Determining the Out-of-Plane Longitudinal Sound Speed in GeS by Broadband Time-Domain Brillouin Scattering
Watheq Al-Basheer1,2, Christian Viernes3, Meixin Cheng3
1Department of Physics, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia.
ACS Omega
|April 8, 2024
Summary
This study measured the sound speed in germanium monosulfide (GeS) 2D crystals using Brillouin scattering. The findings provide elastic properties for these advanced materials.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Two-dimensional (2D) layered materials exhibit unique properties for photonics and optoelectronics.
- Germanium monosulfide (GeS) is a 2D material with potential applications in electronic devices.
Purpose of the Study:
- To determine the out-of-plane longitudinal sound speed in a single germanium monosulfide (GeS) crystal.
- To measure the elastic properties of fragile 2D layered materials using a nondestructive method.
Main Methods:
- Utilized time-domain broadband Brillouin scattering.
- Employed an all-optical technique for elastic property measurement.
Main Results:
- The out-of-plane longitudinal sound speed in GeS was determined to be (4035 ± 200) m/s.
- The out-of-plane compressive elastic constant (C) was found to be (69 ± 7) GPa.
Conclusions:
- Time-domain broadband Brillouin scattering is an effective technique for measuring elastic properties in fragile 2D materials.
- The elastic properties of GeS have been quantified, contributing to the understanding of 2D materials for optoelectronics.
