TY  - JOUR
A1  - Bronner, C.
A1  - Leyssner, F.
A1  - Stremlau, S.
A1  - Utecht, Manuel Martin
A1  - Saalfrank, Peter
A1  - Klamroth, Tillmann
A1  - Tegeder, P.
T1  - Electronic structure of a subnanometer wide bottom-up fabricated graphene nanoribbon: End states, band gap, and dispersion
JF  - Physical review : B, Condensed matter and materials physics
N2  - Angle-resolved two-photon photoemission and high-resolution electron energy loss spectroscopy are employed to derive the electronic structure of a subnanometer atomically precise quasi-one-dimensional graphene nanoribbon (GNR) on Au(111). We resolved occupied and unoccupied electronic bands including their dispersion and determined the band gap, which possesses an unexpectedly large value of 5.1 eV. Supported by density functional theory calculations for the idealized infinite polymer and finite size oligomers, an unoccupied nondispersive electronic state with an energetic position in the middle of the band gap of the GNR could be identified. This state resides at both ends of the ribbon (end state) and is only found in the finite sized systems, i.e., the oligomers.
Y1  - 2012
U6  - https://doi.org/10.1103/PhysRevB.86.085444
SN  - 1098-0121
VL  - 86
IS  - 8
PB  - American Physical Society
CY  - College Park
ER  -