Fan Shiyu, Neal Sabine, Won Choongjae, Kim Jaewook, Sapkota Deepak, Huang Feiting, Yang Junjie, Mandrus David G, Cheong Sang-Wook, Haraldsen Jason T, Musfeldt Janice L
Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, United States.
Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States.
Nano Lett. 2021 Jan 13;21(1):99-106. doi: 10.1021/acs.nanolett.0c03292. Epub 2020 Dec 2.
We combine Raman scattering spectroscopy and lattice dynamics calculations to reveal the fundamental excitations of the intercalated metal monolayers in the FeTaS ( = 1/4, 1/3) family of materials. Both in- and out-of-plane modes are identified, each of which has trends that depend upon the metal-metal distance, the size of the van der Waals gap, and the metal-to-chalcogenide slab mass ratio. We test these trends against the response of similar systems, including Cr-intercalated NbS and RbFe(SO), and demonstrate that the metal monolayer excitations are both coherent and tunable. We discuss the consequences of intercalated metal monolayer excitations for material properties and developing applications.
我们结合拉曼散射光谱和晶格动力学计算，以揭示FeTaS（ = 1/4, 1/3）族材料中插层金属单层的基本激发。识别出了面内和面外模式，每种模式的趋势都取决于金属-金属距离、范德华间隙的大小以及金属与硫族化物板的质量比。我们针对包括Cr插层的NbS和RbFe(SO)在内的类似系统的响应测试了这些趋势，并证明金属单层激发既是相干的又是可调谐的。我们讨论了插层金属单层激发对材料性能和开发应用的影响。
