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5 October 2023 Room temperature wavelike exciton transport in a van der Waals superatomic semiconductor
Jakhangirkhodja A. Tulyagankhodjaev, Petra Shih, Jessica Yu, Xavier Roy, Timothy C. Berkelbach, Milan Delor
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Proceedings Volume PC12650, Physical Chemistry of Semiconductor Materials and Interfaces XXII; PC1265002 (2023) https://doi.org/10.1117/12.2679383
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States
Abstract
The transport of energy and information in semiconductors is limited by scattering between electronic carriers and lattice phonons, resulting in diffusive and lossy transport that curtails all semiconductor technologies. Using Re6Se8Cl2, a van der Waals (vdW) superatomic semiconductor, we demonstrate the formation of acoustic exciton-polarons, an electronic quasiparticle shielded from phonon scattering. We directly image polaron transport in Re6Se8Cl2 at room temperature and reveal quasi-ballistic, wavelike propagation sustained for nanoseconds and several microns. Shielded polaron transport leads to electronic energy propagation orders of magnitude greater than in other vdW semiconductors, exceeding even silicon over nanoseconds. We propose that, counterintuitively, quasi-flat electronic bands and strong exciton–acoustic phonon coupling are together responsible for the remarkable transport properties of Re6Se8Cl2, establishing a new path to ballistic room-temperature semiconductors.
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Jakhangirkhodja A. Tulyagankhodjaev, Petra Shih, Jessica Yu, Xavier Roy, Timothy C. Berkelbach, and Milan Delor "Room temperature wavelike exciton transport in a van der Waals superatomic semiconductor", Proc. SPIE PC12650, Physical Chemistry of Semiconductor Materials and Interfaces XXII, PC1265002 (5 October 2023); https://doi.org/10.1117/12.2679383
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KEYWORDS
Semiconductors
Polarons
Excitons
Phonons
Scattering
Microscopy
Picosecond phenomena
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