Visualization of lattice dynamics and atomic motion in WSe_2 monolayer
- Creators
- Karam, Tony E.
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.Attached Files
Published - 109070D.pdf
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Additional details
- Alternative title
- Visualization of lattice dynamics and atomic motion in WSe2 monolayer
- Eprint ID
- 97592
- Resolver ID
- CaltechAUTHORS:20190801-132149478
- Gordon and Betty Moore Foundation
- Created
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2019-08-01Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field
- Series Name
- Proceedings of SPIE
- Series Volume or Issue Number
- 10907