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Element-specific ultrafast lattice dynamics in monolayer WSe2

MPS-Authors
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Jung,  Hyein       
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Dong,  Shuo
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Zahn,  Daniela
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Vasileiadis,  Thomas       
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons222712

Seiler,  Helene       
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Taylor,  Victoria
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Ernstorfer,  Ralph       
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Windsor,  Yoav William       
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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arXiv:2405.17099.pdf
(Preprint), 704KB

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Citation

Jung, H., Dong, S., Zahn, D., Vasileiadis, T., Seiler, H., Schneider, R., et al. (in preparation). Element-specific ultrafast lattice dynamics in monolayer WSe2.


Cite as: https://hdl.handle.net/21.11116/0000-000F-5AC1-2
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 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.