Visualization of lattice dynamics and atomic motion in WSe2 monolayer

Tony E. Karam

doi:10.1117/12.2510389

4 March 2019 Visualization of lattice dynamics and atomic motion in WSe₂ monolayer

Tony E. Karam

Proceedings Volume 10907, Synthesis and Photonics of Nanoscale Materials XVI; 109070D (2019) https://doi.org/10.1117/12.2510389
Event: SPIE LASE, 2019, San Francisco, California, United States

Abstract

Atomically-thin materials have drawn great interest due to their exotic properties leading to a variety of promising new applications. However, the out-of-equilibrium dynamics of these materials are still not fully understood. Ultrafast electron diffraction (UED) is a powerful technique for the investigation of the transient structural dynamics of monolayers with unprecedented spatiotemporal resolution. The UED results of WSe₂ monolayers are reported and the suppression of the intensity of the Bragg diffraction spots following laser excitation is attributed to electron-phonon and phonon-phonon scattering. A two-temperature model is used to accurately describe these dynamics due to the low thermal conduction of the monolayer. Furthermore, the reported lifetimes are fit using a single-mode relaxation time approximation.

Conference Presentation

Citation Download Citation

Tony E. Karam "Visualization of lattice dynamics and atomic motion in WSe₂ monolayer", Proc. SPIE 10907, Synthesis and Photonics of Nanoscale Materials XVI, 109070D (4 March 2019); https://doi.org/10.1117/12.2510389

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