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 × 10⁹ 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.

中文翻译：

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二维硼硅片的拉曼光谱

二维硼片材的成功制造，其特征是带有周期性孔阵列的三角形晶格，引起了人们对其特殊结构以及诸如超导性之类的特性的极大兴趣。在这里，我们报告了在低温和超高真空下通过原位拉曼光谱和尖端增强拉曼光谱法（TERS）对单层硼片中的振动光谱和电子-声子耦合（EPC）的研究。间隙模式TERS给出3×10 ⁹垂直振动拉曼模式的选择性增强。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，确定了硼苯的振动特性以及EPC。这些结果有助于进一步研究二维硼的机械，电子和可能的超导特性。