Multi-scale time-resolved electron diffraction: A case study in moir\'e materials
| Title: | Multi-scale time-resolved electron diffraction: A case study in moir\'e materials |
|---|---|
| Authors: | Duncan, C. J. R., Kaemingk, M., Li, W. H., Andorf, M. B., Bartnik, A. C., Galdi, A., Gordon, M., Pennington, C. A., Bazarov, I. V., Zeng, H. J., Liu, F., Luo, D., Sood, A., Lindenberg, A. M., Tate, M. W., Muller, D. A., Thom-Levy, J., Gruner, S. M., Maxson, J. M. |
| Publication Year: | 2022 |
| Collection: | Condensed Matter Physics (Other) |
| Subject Terms: | Physics - Instrumentation and Detectors, Condensed Matter - Materials Science |
| More Details: | Ultrafast-optical-pump -- structural-probe measurements, including ultrafast electron and x-ray scattering, provide direct experimental access to the fundamental timescales of atomic motion, and are thus foundational techniques for studying matter out of equilibrium. High-performance detectors are needed in scattering experiments to obtain maximum scientific value from every probe particle. We deploy a hybrid pixel array direct electron detector to perform ultrafast electron diffraction experiments on a WSe$_2$/MoSe$_2$ 2D heterobilayer, resolving the weak features of diffuse scattering and moir\'e superlattice structure without saturating the zero order peak. Enabled by the detector's high frame rate, we show that a chopping technique provides diffraction difference images with signal-to-noise at the shot noise limit. Finally, we demonstrate that a fast detector frame rate coupled with a high repetition rate probe can provide continuous time resolution from femtoseconds to seconds, enabling us to perform a scanning ultrafast electron diffraction experiment that maps thermal transport in WSe$_2$/MoSe$_2$ and resolves distinct diffusion mechanisms in space and time. Comment: Submitted manuscript, 22 pages, 5 figures |
| Document Type: | Working Paper |
| Access URL: | http://arxiv.org/abs/2206.08404 |
| Accession Number: | edsarx.2206.08404 |
| Database: | arXiv |
| Description not available. |