Journal
SCIENCE
Volume 372, Issue 6547, Pages 1181-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abg9015
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Funding
- European Union's Horizon 2020 research and innovation program [851780-ERC-NanoEP]
- Israel Science Foundation [830/19]
- Binational USA-Israel Science Foundation (BSF) [2018288]
- Gutwirth and Jacobs Fellowship
- National Science Foundation [CMMI 1538127]
- government of Spain [FIS2016-81044, CEX2019-000910-S]
- Fundacio Cellex
- Fundacio Mir-Puig
- Generalitat de Catalunya (CERCA, AGAUR) [SGR 1656]
- European Union [881603]
- ERC TOPONANOP [726001]
- European Research Council (ERC) [726001] Funding Source: European Research Council (ERC)
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Investigating the dynamic phenomena of 2D polaritons in 2D materials requires the use of a ultrafast transmission electron microscope with simultaneous spatial and temporal imaging capabilities, which can reveal unknown coherent optical phenomena such as splitting of multibranch wave packets, wave packet deceleration, and acceleration.
Coherent optical excitations in two-dimensional (2D) materials, 2D polaritons, can generate a plethora of optical phenomena that arise from the extraordinary dispersion relations that do not exist in regular materials. Probing of the dynamical phenomena of 2D polaritons requires simultaneous spatial and temporal imaging capabilities and could reveal unknown coherent optical phenomena in 2D materials. Here, we present a spatiotemporal measurement of 2D wave packet dynamics, from its formation to its decay, using an ultrafast transmission electron microscope driven by femtosecond midinfrared pulses. The ability to coherently excite phonon-polariton wave packets and probe their evolution in a nondestructive manner reveals intriguing dispersion-dependent dynamics that includes splitting of multibranch wave packets and, unexpectedly, wave packet deceleration and acceleration. Having access to the full spatiotemporal dynamics of 2D wave packets can be used to illuminate puzzles in topological polaritons and discover exotic nonlinear optical phenomena in 2D materials.
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