Excitonic effects of E11, E22, and E33 in armchair-edged graphene nanoribbons

Journal Article · Fri Mar 14 04:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4867937· OSTI ID:22277915

Lu, Yan; Zhao, Shangqian; Lu, Wengang; Liang, Wenjie ^[1]; Liu, Hong ^[2]

---

1. Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)
2. Physics Department, Nanjing Normal University, Nanjing 210046 (China)

We explore excitonic effects of E11, E22, and E33, which are excitons formed between the three highest valence subbands and the three lowest conduction ones, in armchair-edged graphene nanoribbons by applying the extended tight-binding model including electron-electron interactions. Our results show that the excitation energies and the binding energies decrease inversely with the ribbon widths and can be classified into three categories based on their width indices. We found the relation between the band structures and the binding energies and explained some recent observations of strong excitonic effects in graphene.

• OSTI ID: 22277915
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 10 Vol. 115; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
77 NANOSCIENCE AND NANOTECHNOLOGY
BINDING ENERGY
ELECTRON-ELECTRON COUPLING
EXCITATION
EXCITONS
GRAPHENE
NANOSTRUCTURES
VALENCE