• 文献标题:   Electronic Spectrum and Optical Properties of Y-Shaped Kekule-Patterned Graphene: Band Nesting Resonance as An Optical Signature
  • 文献类型:   Article
  • 作  者:   MOHAMMADI Y
  • 作者关键词:   kekulepatterned graphene, kubo formula, optical conductivity, band nesting resonance
  • 出版物名称:   ECS JOURNAL OF SOLID STATE SCIENCE TECHNOLOGY
  • ISSN:   2162-8769 EI 2162-8777
  • 通讯作者地址:  
  • 被引频次:   1
  • DOI:   10.1149/2162-8777/aca99b
  • 出版年:   2022

▎ 摘  要

Employing tight-binding model we investigate the effects of a uniform Y-shaped Kekule lattice distortion on the electronic spectrum and optical conductivity of graphene. We derive a low-energy effective Hamiltonian which is found to be in excellent agreement with one calculated from a diagonalization of the full tight-binding Hamiltonian. Then using the low-energy Hamiltonian and Kubo formula we obtain an analytical expression for the real part of the optical conductivity used to explore the effects of chemical potential, temperature and on-site and hopping energy deviations in details. In particular we find that Y-shaped Kekue-patterned graphene at finite chemical potential displays a large optical response called band nesting resonance. This effect is shown to be robust against increasing temperature, facilitating its detection as an optical signature for the Y-shaped Kekule distortion even at room temperature.