Antimonene, one of the group V elemental monolayers, has attracted intense interest due to its intriguing electronic properties. Here, we present the optical absorption properties of atomically flat antimonene for which the directional bonds between Sb atoms appear to be analogous to C–C bonds in graphene. The results, based on first-principles density functional theory calculations, predict the absorbance in multilayer antimonene to be comparable or higher than that calculated for multilayer graphene. Specifically, the IR absorption in antimonene is significantly higher with a prominent band at about 4 μm associated with the dipole-allowed interband transitions. Furthermore, a strong dependence of absorbance on topology is predicted for both antimonene and graphene which results from the subtle variations in their stacking-dependent band structures. Our results suggest multilayer antimonene to be a good candidate material for optical power limiting applications in the IR region.

中文翻译：

---

多层二维材料中的吸光度：石墨烯和锑烯

锑烯是 V 族元素单分子层之一，由于其有趣的电子特性而引起了极大的兴趣。在这里，我们展示了原子平面锑烯的光学吸收特性，其中 Sb 原子之间的定向键似乎类似于石墨烯中的 C-C 键。结果，基于第一性原理密度泛函理论计算，预测多层锑烯的吸光度与多层石墨烯的吸光度相当或更高。具体而言，锑烯中的 IR 吸收明显更高，在约 4 μm 处有一个突出的带，与偶极子允许的带间跃迁相关。此外，锑烯和石墨烯的吸光度对拓扑结构有很强的依赖性，这是由于它们依赖于堆叠的能带结构的细微变化造成的。我们的结果表明多层锑烯是红外区域光功率限制应用的良好候选材料。