Raman Spectroscopy of Two-Dimensional Borophene Sheets
Raman Spectroscopy of Two-Dimensional Borophene Sheets
复制标题
二维硼烯片的拉曼光谱
DOI：
10.1021/acsnano.8b08909
复制
发表时间：
2019-04-01
期刊：
影响因子：
17.1
通讯作者：
Wu, Kehui
中科院分区：
文献类型：
--
作者：
Sheng, Shaoxiang;Wu, Jiang-Bin;Wu, Kehui
二维硼片的成功制造，其特征是具有周期性孔阵列的三角形晶格，激发了人们对其特定结构以及可能的超导性等性质的极大兴趣。本文采用原位拉曼和针尖增强拉曼光谱（TERS）技术，在低温和低真空条件下研究了单层硼薄膜的振动光谱和电子-声子耦合（EPC）。间隙模式TERS对垂直振动拉曼模式产生3 x 10（9）的选择性增强。在该系统中实现了1 nm的空间分辨率。结合第一性原理计算，确定了硼氢化物的振动性质和EPC。这些结果有助于进一步研究二维硼的力学、电子学和可能的超导性质。
The successful fabrication of a two-dimensional boron sheet, which features a triangular lattice with periodic hole arrays, has stimulated great interest in its specific structure as well as properties such as possible superconductivity. Here, we report a study on the vibrational spectra and electron-phonon coupling (EPC) in monolayer boron sheets by in situ Raman and tip enhanced Raman spectroscopy (TERS) at low temperature and ultrahigh vacuum. The gap-mode TERS gives a 3 x 10(9) selective enhancement on vertical vibrational Raman modes. A spatial resolution of 1 nm is achieved in this system. Combined with first-principle calculations, the vibrational properties as well as EPC in borophene are determined. The results are helpful for further study on the mechanical, electronic, and possible superconducting properties of two-dimensional boron.