About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Computational Thermodynamics and Kinetics
|
Presentation Title |
Resonant Interaction between Phonons and PbTe/PbSe (001) Misfit Dislocation Networks |
Author(s) |
Yang Li, Zexi Zheng, Adrian Diaz, Simon Phillpot, David McDowell, Youping Chen |
On-Site Speaker (Planned) |
Yang Li |
Abstract Scope |
In this talk, we present a multiscale study on the interaction between phonons and misfit dislocations in PbTe/PbSe(001) heterostructures using the Concurrent Atomistic-Continuum method as the simulation tool. Through visualizing the motions of dislocations under phonon heat pulses and measuring the phonon energy transmission across three types of interfaces (coherent, with misfit dislocations, and with pinned misfit dislocations), we have quantified and illustrated two mechanisms for phonon-dislocation interaction: phonon scattering by the strain field of dislocations, and phonon scattering by dislocations that vibrate via the local modes of a dislocation network. The latter leads to resonant phonon-dislocation interaction, manifested as local maxima of out-of-phase vibration of the atoms on the two sides of the slip plane of dislocations and local minima of phonon energy transmission. This work has also demonstrated the collective motion of misfit dislocation networks under the excitation of heat pulses and quantified the effect of multiple interfaces. |
Proceedings Inclusion? |
Planned: |
Keywords |
Thin Films and Interfaces, Characterization, Computational Materials Science & Engineering |