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Implications of the edge states for the band structure of armchair graphene nanoribbons

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2025, 35(2), pp.767~779
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : May 29, 2024
  • Accepted : October 5, 2024
  • Published : June 5, 2025

Seung Kyu Min 1

1Ulsan National Institute of Science and Technology

Accredited

ABSTRACT

The one-electron states of (7,38) armchair graphene nanoribbon (AGNR) have been investigated in the ground and excited singlet electronic states by a multi-configuration ensemble density functional theory method. The quasiparticle energies for both electron removal and electron addition states were used to construct the electronic bands of the bulk and zigzag edge states of the ribbon. The zigzag edge states of the ribbon are dispersionless and localized at the ribbon termini. Energetically, the electron removal and electron addition edge states are separated by 2.4 eV, which is in good agreement with the experimentally measured splitting of 2.45±0.10 eV in AGNR of similar length. Excitation of the edge electrons results in a highly electrically polarized singlet excited state, where some of the delocalized bulk orbitals become confined within the structural units (anthracene), thus leading to the formation of Wannier–Stark ladder states.

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This paper was written with support from the National Research Foundation of Korea.