Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China.
Nanotechnology. 2017 Feb 24;28(8):085702. doi: 10.1088/1361-6528/aa55e8. Epub 2016 Dec 28.
Recently, black phosphorus quantum dots were fabricated experimentally. Motivated by these experiments, we theoretically investigate the electronic and optical properties of rectangular phosphorene quantum dots (RPQDs) in the presence of an in-plane electric field and a perpendicular magnetic field. The energy spectra and wave functions of RPQDs are obtained numerically using the tight-binding approach. We find edge states within the band gap of the RPQD which are well separated from the bulk states. In an undoped RPQD and for in-plane polarized light, due to the presence of well-defined edge states, we find three types of optical transitions which are between the bulk states, between the edge and bulk states, and between the edge states. The electric and magnetic fields influence the bulk-to-bulk, edge-to-bulk, and edge-to-edge transitions differently due to the different responses of bulk and edge states to these fields.
最近，实验制备了黑磷量子点。受这些实验的启发，我们理论上研究了在平面内电场和垂直磁场存在下矩形磷烯量子点（RPQD）的电子和光学性质。我们使用紧束缚方法数值地获得了 RPQD 的能谱和波函数。我们发现 RPQD 的能带隙内存在边缘态，这些边缘态与体态很好地分离。在未掺杂的 RPQD 和平面偏振光中，由于存在明确定义的边缘态，我们发现了三种光学跃迁，它们分别发生在体态之间、边缘态和体态之间以及边缘态之间。由于体态和边缘态对这些场的不同响应，电场和磁场对体-体、边-体和边-边跃迁的影响不同。
