• 文献标题:   Multi-orbital tight binding model for the electronic and optical properties of armchair graphene nanoribbons in the presence of a periodic potential
  • 文献类型:   Article
  • 作  者:   HIEU NN, SHIH PH, DO TN, NGUYEN CV
  • 作者关键词:   graphene nanoribbon, optical spectra, modulated potential
  • 出版物名称:   JOURNAL OF PHYSICSCONDENSED MATTER
  • ISSN:   0953-8984 EI 1361-648X
  • 通讯作者地址:  
  • 被引频次:   3
  • DOI:   10.1088/1361-648X/abdf01
  • 出版年:   2021

▎ 摘  要

The influences of an external electric field with uniform or modulated potential on the electronic and optical properties of armchair graphene nanoribbons (GNRs) are explored using the multi-orbital tight-binding Hamiltonian. The interplay between an electric field and interaction between (s, p(x), p(y), p(z)) orbitals remarkably enriches the main features of band structures and absorption spectra. The applied electric field can notably alter the energy dispersions of pi and sigma bands, leading to the deformation of band-edge states, open and close of a band gap, and modification of the Fermi energy. The vertical optical excitations happen among the pi bands, while their available channels depend on the Fermi level which is controlled by the sigma-edge bands and a finite potential. With the rich and unique properties, GNRs are suitable candidates for applications in the fields of photodetectors, nanoelectronics, and spintronics. The calculated results are expected to be examined by the angle-resolved photoemission spectroscopies and optical spectroscopies.