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Electric-and magnetic-field dependence of the electronic and optical properties of phosphorene quantum dots

机译:磷烯量子点的电子和光学性能的电磁场依赖性

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摘要

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.
机译:最近,通过实验制造黑磷量子点。 通过这些实验的激励,理论上,在平面内电场和垂直磁场的存在下,理论上地研究矩形磷烯量子点(RPQDS)的电子和光学性质。 RPQD的能谱和波浪功能在数字上使用紧密结合方法获得。 我们在RPQD的带隙中找到边缘状态,从批量状态分开。 在一个未掺杂的RPQD和用于面内偏振光,由于存在明确定义的边缘状态,我们在边缘和散装之间以及边缘状态之间找到散装状态之间的三种类型的光学转换。 由于批量和边缘状态与这些字段的不同响应,电磁场不同地影响批量到散装,边缘到散装和边缘到边缘的转换。

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