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- W4387014671 abstract "Ultrafast light-matter interaction has emerged as a powerful tool to control and probe the macroscopic properties of functional materials, especially two-dimensional transition metal dichalcogenides that can form different structural phases with distinct physical properties. However, it is often difficult to accurately determine the transient optical constants. In this work, we developed a near-infrared pump---a terahertz to midinfrared (12--22 THz) probe system in transmission geometry to measure the transient optical conductivity in $2H{text{ensuremath{-}}mathrm{Mo}mathrm{Te}}_{2}$ layered material. By performing separate measurements on bulk and thin-film samples, we are able to overcome issues related to nonuniform substrate thickness and penetration depth mismatch and to extract the transient optical constants reliably. Our results show that photoexcitation at 690 nm induces a transient insulator-metal transition, while photoexcitation at $2phantom{rule{0.2em}{0ex}}text{ensuremath{mu}}mathrm{m}$ has a much smaller effect due to the photon energy being smaller than the band gap of the material. Combining this with a single-color pump-probe measurement, we show that the transient response evolves towards the $1{T}^{{}^{ensuremath{'}}}$ phase at higher fluence. Our work provides a comprehensive understanding of the photoinduced phase transition in the $2H{text{ensuremath{-}}mathrm{Mo}mathrm{Te}}_{2}$ system." @default.
- W4387014671 created "2023-09-26" @default.
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- W4387014671 date "2023-09-25" @default.
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- W4387014671 title "Direct Measurement of Photoinduced Transient Conducting State in Multilayer <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline overflow=scroll><mml:mn>2</mml:mn><mml:mi>H</mml:mi><mml:msub><mml:mrow><mml:mtext>−</mml:mtext><mml:mi>Mo</mml:mi><mml:mi>Te</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:math>" @default.
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- W4387014671 doi "https://doi.org/10.1103/physrevapplied.20.034058" @default.
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