Abstract
Optical excitations of monolayer bismuthene present very rich and unique absorption spectra. The optical energy gap corresponding to the threshold frequency is not equal to an indirect energy gap, and it becomes zero under the critical electric field. The frequency, number, intensity, and form of the absorption structures are dramatically changed when an external electric field is applied. The prominent peaks and the observable shoulders, respectively, arise from the constant-energy loop and the band-edge states of parabolic dispersions. These directly reflect the unusual electronic properties, being very different from those in monolayer graphene. The novel optical properties of bismuthine that are easily manipulated by electric fields may find a lot of various applications in optoelectronics, either combined with or complementary to those graphene-based systems.
© 2018 Optical Society of America
Full Article | PDF ArticleMore Like This
Po-Hsin Shih, Thi-Nga Do, Godfrey Gumbs, Hai Duong Pham, and Ming-Fa Lin
Opt. Lett. 44(19) 4721-4724 (2019)
Nguyen N. Hieu, Po-Hsin Shih, Bui D. Hoi, Thi-Nga Do, and Chuong V. Nguyen
J. Opt. Soc. Am. B 38(8) 2284-2289 (2021)
Xue Bai, Qi Jiang, Pei Song, Ze-Peng Jia, Sen Lu, Zhi-Kai Gao, Shao-Hua Lang, Hong Cui, Rong Feng, Zhi-Yong Liang, Qin Kang, and Hong-Kuan Yuan
Opt. Express 31(19) 31504-31521 (2023)