Peculiar optical properties of bilayer silicene under the influence of external electric and magnetic fields

Thi Nga Do, Godfrey Gumbs, Po Hsin Shih, Danhong Huang, Chih Wei Chiu, Chia Yun Chen, Ming Fa Lin

研究成果: Article

2 引文 斯高帕斯(Scopus)

摘要

We conduct a comprehensive investigation of the effect of an applied electric field on the optical and magneto-optical absorption spectra for AB-bt (bottom-top) bilayer silicene. The generalized tight-binding model in conjunction with the Kubo formula is efficiently employed in the numerical calculations. The electronic and optical properties are greatly diversified by the buckled lattice structure, stacking configuration, intralayer and interlayer hopping interactions, spin-orbital couplings, as well as the electric and magnetic fields (Ezzˆ & Bzzˆ). An electric field induces spin-split electronic states, a semiconductor-metal phase transitions and the Dirac cone formations in different valleys, leading to the special absorption features. The Ez-dependent low-lying Landau levels possess lower degeneracy, valley-created localization centers, peculiar distributions of quantum numbers, well-behaved and abnormal energy spectra in Bz-dependencies, and the absence of anti-crossing behavior. Consequently, the specific magneto-optical selection rules exist for diverse excitation categories under certain critical electric fields. The optical gaps are reduced as Ez is increased, but enhanced by Bz, in which the threshold channel might dramatically change in the former case. These characteristics are in sharp contrast with those for layered graphene.

原文English
文章編號624
期刊Scientific reports
9
發行號1
DOIs
出版狀態Published - 2019 十二月 1

All Science Journal Classification (ASJC) codes

  • General

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