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Element-Specific Ultrafast Lattice Dynamics in Monolayer WSe2

Year: 2024

Type: article

Abstract: We study monolayer WSe2 using ultrafast electron diffraction. We introduce an approach to quantitatively extract atomic-site-specific information, providing an element-specific view of incoherent atomic vibrations following femtosecond excitation. Via differences between W and Se vibrations, we identify stages in the nonthermal evolution of the phonon population. Combined with a calculated phonon dispersion, this element specificity enables us to identify a long-lasting overpopulation of specific optical phonons and to interpret the stages as energy transfer processes between specific phonon groups. These results demonstrate the appeal of resolving element-specific vibrational information in the ultrafast time domain.

Source: DepositOnce

DOI: 10.14279/depositonce-22016

Authors: Jung, Hyein, Dong, Shuo, Zahn, Daniela, Vasileiadis, Thomas, Seiler, Helene, Schneider, Robert, Michaelis de Vasconcellos, Steffen, Taylor, Victoria C. A., Bratschitsch, Rudolf, Ernstorfer, Ralph, Windsor, Yoav William

Language: English

Topic: 2D Materials and Applications

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W6904776954

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