Vibrational Properties of a Naturally Occurring Semiconducting van der Waals Heterostructure
Vibrational Properties of a Naturally Occurring Semiconducting van der Waals Heterostructure
复制标题
天然半导体范德华异质结构的振动特性
DOI：
10.1021/acs.jpcc.1c05241
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Newaz, A. K.
中科院分区：
文献类型：
--
作者：
Costa, Viviane Zurdo;Liang, Liangbo;Vaziri, Sam;Miller, Addison;Pop, Eric;Newaz, A. K.
我们介绍了辉石的振动性质，这是一种自然产生的范德华异质结构，由两个不同的半导体层组成。辉钛矿是一种复杂的层状晶体，由交替的类SnS_2伪六方层和类PbS类伪四方层堆叠而成，为研究质量密度和声子失配的层间振动性质和热输运提供了独特的平台。利用显微拉曼光谱和第一性原理拉曼模拟发现，类PbS准四方结构主要由Pb3SbS4组成。我们还发现了几个源于准四方晶层的层内振动的低频拉曼模式。利用密度泛函理论，我们确定了斜方沸石的所有振动模式，它们的特征在拉曼光谱中观察到。通过研究随温度变化的拉曼光谱(300-500K)，我们发现伪四方层和伪六方层的温度系数不同。我们相信，我们的研究将有助于理解其复杂异质结构的振动模式和纳米尺度下的热性质。
We present vibrational properties of Franckeite, which is a naturally occurring van der Waals heterostructure consisting of two different semiconducting layers. Franckeite is a complex layered crystal composed of alternating SnS2-like pseudohexagonal and PbS-like pseudotetragonal layers stacked on top of each other, providing a unique platform to study vibrational properties and thermal transport across layers with mass density and phonon mismatches. Using micro-Raman spectroscopy and first-principles Raman simulations, we found that the PbS-like pseudotetragonal structure is mostly composed of Pb3SbS4. We also discovered several low-frequency Raman modes that originate from the intralayer vibrations of the pseudotetragonal layer. Using density functional theory, we determined all vibrational patterns of Franckeite, whose signatures are observed in the Raman spectrum. By studying temperature-dependent Raman spectroscopy (300–500 K), we have found different temperature coefficients for both pseudotetragonal and pseudohexagonal layers. We believe that our study will help understand the vibration modes of its complex heterostructure and the thermal properties at the nanoscale.
影响因子：
38.3
作者：
Dean, C. R.;Young, A. F.;Hone, J.
通讯作者：
Hone, J.
使用从头计算和离子淌度质谱法分析糖肽离子的分子结构
DOI：
--
发表时间：
2019
期刊：
影响因子：
--
作者：
中村賀美;竹内孝江
通讯作者：
竹内孝江