Triple sum frequency pump-probe spectroscopy of transition metal dichalcogenides

被引：9

作者：

Morrow, Darien J. ^{[1
]}

Kohler, Daniel D. ^{[1
]}

Zhao, Yuzhou ^{[1
]}

Jin, Song ^{[1
]}

Wright, John C. ^{[1
]}

机构：

[1] Univ Wisconsin, Dept Chem, 1101 Univ Ave, Madison, WI 53706 USA

来源：

PHYSICAL REVIEW B | 2019年 / 100卷 / 23期

关键词：

PHOTOINDUCED BANDGAP RENORMALIZATION; MONOLAYER MOS2; 2-PHOTON ABSORPTION; MONO LAYER; COHERENT; DYNAMICS; ELECTRON; TIME; WS2; GENERATION;

D O I：

10.1103/PhysRevB.100.235303

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Triple sum frequency (TSF) spectroscopy measures multidimensional spectra by resonantly exciting multiple quantum coherences of vibrational and electronic states. In this work we demonstrate pump-TSF-probe spectroscopy in which a pump excites a sample and some time later three additional electric fields generate a probe field which is measured. We demonstrate pump-TSF-probe spectroscopy on polycrystalline, smooth, thin films and spiral nanostructures of both MoS2 and WS2. The pump-TSF-probe spectra are qualitatively similar to the more conventional transient-reflectance spectra. While transient-reflectance sensitivity suffers under low surface coverage, pump-TSF-probe sensitivity is independent of the sample coverage and nanostructure morphologies. Our results demonstrate that pump-TSF-probe is a valuable methodology for studying microscopic material systems.

引用

页数：16

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