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

被引：49
作者：
Mannebach, Ehren M. [1 ]
Duerloo, Karel-Alexander N. [1 ]
Pellouchoud, Lenson A. [1 ]
Sher, Meng-Ju [2 ]
Nah, Sanghee [1 ,2 ]
Kuo, Yi-Hong [3 ]
Yu, Yifei [4 ]
Marshall, Ann F. [5 ]
Cao, Linyou [4 ]
Reed, Evan J. [1 ]
Lindenberg, Aaron M. [1 ,2 ,6 ]
机构：
[1] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA
[2] SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA
[3] Stanford Univ, Dept Elect Engn, Stanford, CA 94305 USA
[4] N Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA
[5] Stanford Univ, Stanford Nanocharacterizat Lab, Stanford, CA 94305 USA
[6] SLAC Natl Accelerator Lab, PULSE Inst, Menlo Pk, CA 94025 USA
来源：
ACS NANO | 2014年 / 8卷 / 10期
关键词：
molybdenum disulfide; MoS2; second harmonic generation; ultrafast dynamics; monotayer femtosecond; CARRIER DYNAMICS; 2ND-HARMONIC GENERATION; MONO LAYER; NONLINEAR SUSCEPTIBILITY; MOLYBDENUM-DISULFIDE; OPTICAL-PROPERTIES; ABSORPTION; HETEROSTRUCTURES; NANOSHEETS;
D O I：
10.1021/nn5044542
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
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.
引用
收藏
页码：10734 / 10742
页数：9
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