Ultrafast Electronic and Structural Response of Monolayer MoS2 under Intense Photoexcitation Conditions

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• 作者：Ehren M. Mannebach ; Karel-Alexander N. Duerloo ; Lenson A. Pellouchoud ; Meng-Ju Sher ; Sanghee Nah ; Yi-Hong Kuo ; Yifei Yu ; Ann F. Marshall ; Linyou Cao ; Evan J. Reed ; Aaron M. Lindenberg
• 刊名：ACS Nano
• 出版年：2014
• 出版时间：October 28, 2014
• 年：2014
• 卷：8
• 期：10
• 页码：10734-10742
• 全文大小：615K
• ISSN：1936-086X

文摘

We report on the dynamical response of single layer transition metal dichalcogenide MoS₂ to intense above-bandgap photoexcitation using the nonlinear-optical second order susceptibility as a direct probe of the electronic and structural dynamics. Excitation conditions corresponding to the order of one electron鈥揾ole pair per unit cell generate unexpected increases in the second harmonic from monolayer films, occurring on few picosecond time-scales. These large amplitude changes recover on tens of picosecond time-scales and are reversible at megahertz repetition rates with no photoinduced change in lattice symmetry observed despite the extreme excitation conditions.

Keywords:

molybdenum disulfide; MoS₂; second harmonic generation; ultrafast dynamics; monolayer; femtosecond