Xing, Xinlai and Wen, Fei and Schaefer, Sascha and Zhong, Dongping (2025) Vibrational Dynamics in Black Phosphorus Membranes Visualized by Ultrafast Electron Microscopy. JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 16 (47). pp. 12246-12254. ISSN 1948-7185,
Full text not available from this repository. (Request a copy)Abstract
In ultrafast electron microscopy (UEM), light-induced temporal changes in electron micrographs provide key insights into physical and chemical processes. However, the microscopic origins of related contrast dynamics require further understanding. Here, we applied stroboscopic UEM and pixel-by-pixel image analysis to study oscillatory bending dynamics in suspended black phosphorus (BP) membranes following femtosecond laser excitation. Experiments at various temperatures showed contrast oscillations exclusively at membrane wrinkle sites, with two frequencies occurring globally across the membrane and increasing upon cooling. Statistical analysis revealed oscillation phases clustered around two values separated by pi. Our findings indicate a global membrane vibration rather than coupled localized modes. Periodic lattice distortions at wrinkles modulate the local crystal orientation relative to the electron beam, inducing time-dependent contrast variations. This work provides a clear framework for analyzing contrast dynamics in complex systems, benefiting the development of temperature-sensitive BP-based nanoelectromechanical system (NEMS) applications.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TRANSIENT STRUCTURES; FIELD; DIFFRACTION; RESONATORS; PHYSICS; PULSES; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Regensburg Center for UltrafastNanoscopy (RUN) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 16 Jun 2026 09:12 |
| Last Modified: | 16 Jun 2026 09:12 |
| URI: | https://pred.uni-regensburg.de/id/eprint/66144 |
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