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Published March 4, 2019 | Published
Book Section - Chapter Open

Visualization of lattice dynamics and atomic motion in WSe_2 monolayer

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.

Additional Information

© 2019 Society of Photo-Optical Instrumentation Engineers (SPIE). Generous financial support for this work was provided by the Gordon and Betty Moore Foundation. This manuscript is dedicated to the memory of our mentor Professor Ahmed H. Zewail.

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