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ACS Nano. 2014 Oct 28;8(10):10734-42. doi: 10.1021/nn5044542. Epub 2014 Sep 29.

Ultrafast electronic and structural response of monolayer MoS2 under intense photoexcitation conditions.

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Department of Materials Science and Engineering, Stanford University , Stanford, California 94305, United States.


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-hole 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.


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


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