论文标题
红外光谱法对几层黑色磷的光导率
The optical conductivity of few-layer black phosphorus by infrared spectroscopy
论文作者
论文摘要
光 - 物质相互作用的强度在光子学和光电子学中至关重要。对于许多广泛研究的二维半导体（例如MOS2），由于激子共振引起的光吸收会随厚度而增加。但是，我们将在这里显示，几层黑磷表现出相反的趋势。我们通过红外光谱确定了厚度向双层厚度向双层的几层黑色磷的光导率。与我们的期望相反，发现频率集成的激子吸收在较薄的样品中得到了增强。此外，带边缘附近的连续吸收几乎是恒定的，与厚度无关。我们将显示这种情况与石墨烯的通用光学电导率的量子有关，其前景源来自带动段。
The strength of light-matter interaction is of central importance in photonics and optoelectronics. For many widely studied two-dimensional semiconductors, such as MoS2, the optical absorption due to exciton resonances increases with thickness. However, here we will show, few-layer black phosphorus exhibits an opposite trend. We determine the optical conductivity of few-layer black phosphorus with thickness down to bilayer by infrared spectroscopy. On the contrary to our expectations, the frequency-integrated exciton absorption is found to be enhanced in thinner samples. Moreover, the continuum absorption near the band edge is almost a constant, independent of the thickness. We will show such scenario is related to the quanta of the universal optical conductivity of graphene, with a prefactor originating from the band anisotropy.
