Magneto-electronic structures and optical transitions of non-uniform graphene nanoribbons
Hsien-Ching Chung (鍾 獻慶)1,2*, Ming-Fa Lin (林 明發)1
1Department of Physics, National Cheng Kung University, Tainan, Taiwan
2Center for Micro/Nano Science and Technology (CMNST), National Cheng Kung University, Tainan, Taiwan
* presenting author:Hsien-Ching Chung,
We use tight-binding theory to study the magneto-electronic and optical properties of non-uniform GNRs. The non-uniform GNRs, composed of two GNRs with different widths, have been synthesized by mechanically exfoliated from bulk graphite. Their essential properties are highly sensitive to the geometric configuration and strength of magnetic field. Four categories of electronic structure are exhibited, including the monolayer-like, bilayer-like, distorted, and coexistent quasi-Landau level spectra. The density of state and wave functions are also discussed in detail. The diversified magneto-absorption spectra and selection rules, reflecting the electronic structures, are reported at last.

Keywords: graphene nanoribbon, electronic property, optical property, magnetic quantization, quasi-Landau level