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Visualization of lattice dynamics and atomic motion in WSe_2 monolayer

Karam, Tony E. (2019) Visualization of lattice dynamics and atomic motion in WSe_2 monolayer. In: Synthesis and Photonics of Nanoscale Materials XVI. Proceedings of SPIE. No.10907. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 109070D. ISBN 9781510624566. https://resolver.caltech.edu/CaltechAUTHORS:20190801-132149478

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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.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.2510389DOIArticle
ORCID:
AuthorORCID
Karam, Tony E.0000-0002-1244-5141
Alternate Title:Visualization of lattice dynamics and atomic motion in WSe2 monolayer
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.
Funders:
Funding AgencyGrant Number
Gordon and Betty Moore FoundationUNSPECIFIED
Series Name:Proceedings of SPIE
Issue or Number:10907
Record Number:CaltechAUTHORS:20190801-132149478
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190801-132149478
Official 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
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97592
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:01 Aug 2019 20:30
Last Modified:03 Oct 2019 21:33

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