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24 October 2023 Ultrafast photocurrents in layered PtSe2
Martin Micica, Sukhdeep Dhillon
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Proceedings Volume PC12683, Terahertz Emitters, Receivers, and Applications XIV; PC1268309 (2023) https://doi.org/10.1117/12.2681902
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States
Abstract
Platinum diselenide (PtSe2) is a promising two-dimensional (2D) material for the terahertz (THz) range as, unlike other transition metal dichalcogenides (TMDs), its bandgap can be uniquely tuned from a semiconductor in the near-infrared to a semimetal with the number of atomic layers. Here, we demonstrate that a controlled THz nonlinearity and circular dichroism - tuned from monolayer to bulk PtSe2 - can be realized in wafer size polycrystalline PtSe2 through the generation of ultrafast photocurrents and the engineering of the bandstructure valleys. These results highlight that PtSe2 is promising for THz photonic applications, ranging from THz valleytronics to harmonic generation.
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Martin Micica and Sukhdeep Dhillon "Ultrafast photocurrents in layered PtSe2", Proc. SPIE PC12683, Terahertz Emitters, Receivers, and Applications XIV, PC1268309 (24 October 2023); https://doi.org/10.1117/12.2681902
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KEYWORDS
Terahertz radiation
Ultrafast phenomena
Photocurrent
Harmonic generation
Metalloids
Monolayers
Engineering
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