| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
2D Materials – Preparation, Properties & Applications
|
| Presentation Title |
Low Temperature Phonon Anharmonicity in Tungsten Diselenide |
| Author(s) |
Qingan Cai |
| On-Site Speaker (Planned) |
Qingan Cai |
| Abstract Scope |
Tungsten diselenide has been extensively studied for its potential applications in optoelectronic and valleytronic devices. Reliable and stable performance of these devices requires outstanding thermal properties of tungsten diselenide. In this work, temperature dependent phonon dispersions of bulk tungsten diselenide are measured by inelastic X-ray scattering along high symmetry directions in Brillouin zone. Ab initio phonon calculation based on Density Function Theory agrees well with the experimental results. The analysis about Grüneisen parameters of out-of-plane acoustic phonons (flexural mode) near 𝛤 indicates giant phonon anharmonicity. Our results provide the experimental measurement of phonon dispersions and revels the inhomogeneous interlayer interactions in tungsten diselenide. They are crucial in investigating the thermal conductivity of this popular material. |
| Proceedings Inclusion? |
Planned: |