Phosphorene, a single atomic layer of black phosphorus, has recently emerged as a new twodimensional (2D) material that holds promise for electronic and photonic technology. Here we experimentally demonstrate that the electronic structure of few-layer phosphorene varies significantly with the number of layers, in good agreement with theoretical predictions. The interband optical transitions cover a wide, technologically important spectrum range from visible to mid-infrared. In addition, we observe strong photoluminescence in few-layer phosphorene at energies that match well with the absorption edge, indicating they are direct bandgap semiconductors. The strongly layer-dependent electronic structure of phosphorene, in combination with its high electrical mobility, gives it distinct advantages over other twodimensional materials in electronic and opto-electronic applications.
@article{arxiv.1601.03103,
title = {Direct Observation of Layer-Dependent Electronic Structure in Phosphorene},
author = {Likai Li and Jonghwan Kim and Chenhao Jin and Guojun Ye and Diana Y. Qiu and Felipe H. da Jornada and Zhiwen Shi and Long Chen and Zuocheng Zhang and Fangyuan Yang and Kenji Watanabe and Takashi Taniguchi and Wencai Ren and Steven G. Louie and Xianhui Chen and Yuanbo Zhang and Feng Wang},
journal= {arXiv preprint arXiv:1601.03103},
year = {2017}
}
Comments
17 pages, 4 figures, Likai Li, Jonghwan Kim, Chenhao Jin contributed equally to this work