Element-specific ultrafast lattice dynamics in monolayer WSe2

Autor:	Jung, H., Dong, S., Zahn, D., Vasileiadis, T., Seiler, H., Schneider, R., de Vasconcellos, S. Michaelis, Taylor, V. C. A., Bratschitsch, R., Ernstorfer, R., Windsor, Y. W.
Rok vydání:	2024
Předmět:	Condensed Matter - Materials Science
Druh dokumentu:	Working Paper
Popis:	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 lattice. 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. Comment: 13 pages, 3 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2405.17099 Zobrazit plný text záznamu View this record from Arxiv