Electronic Spectrum and Optical Properties of Y-Shaped Kekulé-Patterned Graphene: Band Nesting Resonance as An Optical Signature

Employing tight-binding model we investigate the effects of a uniform Y-shaped Kekulé 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 diagonalizatio...

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Bibliographic Details
Published in:ECS journal of solid state science and technology 2022-12, Vol.11 (12), p.121004
Main Author: Mohammadi, Yawar
Format: Article
Language:English
Subjects:
Band nesting resonance
Kekule-patterned graphene
Kubo Formula
Optical conductivity
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Summary:Employing tight-binding model we investigate the effects of a uniform Y-shaped Kekulé 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 Kekué-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 Kekulé distortion even at room temperature.
ISSN:2162-8769
2162-8777
DOI:10.1149/2162-8777/aca99b