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

页码：10734 / 10742

页数：9

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