Carrier density oscillation in the photoexcited semiconductor
- Creators
- Najafi, Ebrahim
- Jafari, Amir
- Liao, Bolin
Abstract
The perturbation of a semiconductor from the thermodynamic equilibrium often leads to the display of non-linear dynamics and formation of spatiotemporal patterns due to the spontaneous generation of competing processes. Here, we use scanning ultrafast electron microscopy to show that the transport of hot carriers in the strongly excited semiconductor slows down by turning into an oscillatory process; this is evidenced by the expansions and contractions in the second moment of the distribution. We attribute such a response to the electric field generated by the spatial separation of photo-excited electrons and holes under intrinsic and photo-induced fields; we then introduce a transport model that mimics the experimental observation. Our finding provides a direct imaging evidence for the electrostatic oscillation of hot carriers in the highly excited semiconductor and offers new insights into their dynamics in space and time.
Additional Information
© 2021 IOP Publishing Ltd. Received 20 October 2020; Accepted 8 December 2020; Published 19 January 2021. This work was supported by NSF Grant DMR-0964886 and Air Force Office of Scientific Research Grant FA9550-11-1-0055 in the Physical Biology Center for Ultrafast Science and Technology at California Institute of Technology, which is supported by the Gordon and Betty Moore Foundation. Bolin Laio acknowledges support from the US Department of Energy (Award Number DE-SC0019244) and National Science Foundation (Award Number DMR-1905389). Data availability statement: The data that support the findings of this study are available from the corresponding author upon request.Attached Files
Submitted - 1909.06338.pdf
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Additional details
- Eprint ID
- 99770
- DOI
- 10.1088/1361-6463/abd1a4
- Resolver ID
- CaltechAUTHORS:20191111-085308090
- DMR-0964886
- NSF
- FA9550-11-1-0055
- Air Force Office of Scientific Research (AFOSR)
- Gordon and Betty Moore Foundation
- DE-SC0019244
- Department of Energy (DOE)
- DMR-1905389
- NSF
- Created
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2019-11-12Created from EPrint's datestamp field
- Updated
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2022-07-12Created from EPrint's last_modified field