Resolving the Spatial Structures of Bound Hole States in Black Phosphorus.
Resolving the Spatial Structures of Bound Hole States in Black Phosphorus.
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DOI：
10.1021/acs.nanolett.7b03356
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发表时间：
2017-10
期刊：
影响因子：
10.8
通讯作者：
Z. Qiu;Hanyan Fang;A. Carvalho;A. Rodin;Yanpeng Liu;Sherman Jun;R. Tan;Mykola Telychko;Pin Lv;Jie Su;Yewu Wang;A. Neto;Jiong Lu
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文献类型：
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作者：
Z. Qiu;Hanyan Fang;A. Carvalho;A. Rodin;Yanpeng Liu;Sherman Jun;R. Tan;Mykola Telychko;Pin Lv;Jie Su;Yewu Wang;A. Neto;Jiong Lu
了解黑磷（BP）中单个缺陷和掺杂剂的局域电子特性对于基础研究和技术应用都非常重要。在这里，我们采用低温扫描隧道显微镜（LT-STM）来探测BP中单个受体的局域电子结构。我们证明，通过控制尖端引起的带弯曲可以可逆地切换各个受体的电荷状态。此外，隧道光谱中与受体相关的共振特征可归因于类里德堡束缚空穴态的形成。量子束缚态的空间映射显示出两种不同的形状，从 1s 基态的延伸椭圆形状到 2px 激发态的哑铃形状。束缚空穴态的波函数可以使用具有各向异性有效质量的类氢模型来很好地描述，并得到我们的理论计算的证实。我们的发现不仅为这种各向异性二维材料中单一掺杂剂周围的多体相互作用提供了新的见解，而且为新型量子器件的设计铺平了道路。
Understanding the local electronic properties of individual defects and dopants in black phosphorus (BP) is of great importance for both fundamental research and technological applications. Here, we employ low-temperature scanning tunnelling microscope (LT-STM) to probe the local electronic structures of single acceptors in BP. We demonstrate that the charge state of individual acceptors can be reversibly switched by controlling the tip-induced band bending. In addition, acceptor-related resonance features in the tunnelling spectra can be attributed to the formation of Rydberg-like bound hole states. The spatial mapping of the quantum bound states shows two distinct shapes evolving from an extended ellipse shape for the 1s ground state to a dumbbell shape for the 2px excited state. The wave functions of bound hole states can be well-described using the hydrogen-like model with anisotropic effective mass, corroborated by our theoretical calculations. Our findings not only provide new insight into the many-body interactions around single dopants in this anisotropic two-dimensional material but also pave the way to the design of novel quantum devices.