Communication: Multidimensional triple sum-frequency spectroscopy of MoS2 and comparisons with absorption and second harmonic generation spectroscopies.
Communication: Multidimensional triple sum-frequency spectroscopy of MoS2 and comparisons with absorption and second harmonic generation spectroscopies.
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通讯：MoS2 的多维三重和频光谱以及与吸收光谱和二次谐波发生光谱的比较。
DOI：
10.1063/1.5047802
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
J. C. Wright
中科院分区：
文献类型：
--
作者：
Darien J. Morrow;Daniel D. Kohler;Kyle J. Czech;J. C. Wright
三重和频（TSF）光谱是最近发展起来的一种方法，它通过共振激发振动态和电子态的多个量子相干来收集多维光谱。本文报道了TSF在半导体电子态中的首次应用。两个独立可调的超快脉冲激发二硫化钼薄膜的A、B和C特征。测量的TSF光谱与吸收和二次谐波产生光谱有明显的不同。差异的产生是由于跃迁矩和态的联合密度（JDOS）的相对重要性。我们建立了一个简单的模型，并对吸收谱和谐波谱进行了全局拟合，从中提取了JDOS和跃迁矩。我们的结果验证了之前将C特性分配给通过带嵌套创建的大型JDOS的结果。
Triple sum-frequency (TSF) spectroscopy is a recently developed methodology that enables collection of multidimensional spectra by resonantly exciting multiple quantum coherences of vibrational and electronic states. This work reports the first application of TSF to the electronic states of semiconductors. Two independently tunable ultrafast pulses excite the A, B, and C features of a MoS2 thin film. The measured TSF spectrum differs markedly from absorption and second harmonic generation spectra. The differences arise because of the relative importance of transition moments and the joint density of states (JDOS). We develop a simple model and globally fit the absorption and harmonic generation spectra to extract the JDOS and the transition moments from these spectra. Our results validate previous assignments of the C feature to a large JDOS created by band nesting.
相干三和频谱中的干扰和相位失配效应
影响因子：
2.3
作者：
Handali, Jonathan D.;Sunden, Kyle F.;Kaufman, Emily M.;Wright, John C.
通讯作者：
Wright, John C.