Influence of electric and magnetic fields and s-edge bands on the electronic and optical spectra of graphene nanoribbons

Thi Nga Do, Po Hsin Shih, Godfrey Gumbs, Danhong Huang

研究成果: Article同行評審

4 引文 斯高帕斯(Scopus)

摘要

The unusual electronic and optical properties of armchair and zigzag graphene nanoribbons (GNRs) subject to in-plane transverse electric and perpendicular magnetic fields have been systematically investigated. Our calculations were carried out within the generalized multiorbital tight-binding model based on a Hamiltonian which takes into account hopping integrals among the (s,px,py, and pz) atomic orbitals as well as the external electric and magnetic fields. The electronic structure consists of π bands arising from the pz orbital and σ bands originating from the (s,px, and py) orbitals. The energy bands and optical spectra are diversified by both the nature of the edge of the nanoribbon and the strength of the external fields. Armchair GNRs display a width-dependent energy gap in addition to low-energy σ bands whereas the zigzag system has the unfilled flatband with π edge states at zero energy and partially filled wide-range σ bands. An applied in-plane electric field leads to the splitting of energy bands and shifted Fermi level thereby enriching the interband and intraband optical conductivities. The interplay between an external magnetic field and the edge geometry gives rise to extraordinary quantized Landau levels and special optical spectra.

原文English
文章編號115408
期刊Physical Review B
103
發行號11
DOIs
出版狀態Published - 2021 3月 5

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學

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