Electron dynamics in unoccupied states of spatially aligned 7-a graphene nanoribbons on Au(788)

Bottom-up synthesized armchair graphene nanoribbons with a width of seven C = C bonds (7-aGNRs) have gained widespread interest due to their large band gap of about 2.8 eV and their atomically precise edge structures. Here, we report on the lifetime of excited states of spatially aligned 7-aGNRs gro...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2014-12, Vol.90 (24), Article 245408
Main Authors: Kleimeier, N. F., Timmer, A., Bignardi, L., Mönig, H., Feng, X. L., Müllen, K., Chi, L. F., Fuchs, H., Zacharias, H.
Format: Article
Language:English
Subjects:
Alignment
Banded structure
Chairs
Condensed matter
Dynamics
Excitation
Graphene
Nanostructure
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Summary:Bottom-up synthesized armchair graphene nanoribbons with a width of seven C = C bonds (7-aGNRs) have gained widespread interest due to their large band gap of about 2.8 eV and their atomically precise edge structures. Here, we report on the lifetime of excited states of spatially aligned 7-aGNRs grown on a vicinal Au(788) surface. Time-resolved three-photon photoemission spectroscopy at hv = 3.15 eV was carried out to measure the lifetimes of states located at E sub(1) - E sub(F) = 3.6 eV and E sub(2) - E sub(F) = 3.8 eV via a resonant excitation from an unoccupied state at E - E sub(F) = 0.6 eV. Lifetimes of [tau] sub(1) = (110 + or - 13) fs and [tau] sub(2) = (75 + or - 10) fs are observed, respectively.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.90.245408