Excitonic states in Narrow armchair graphene nanoribbons on gold surfaces

• Verfasst von: Bronner, Christopher [VerfasserIn]
• Verfasst von: Gerbert, David [VerfasserIn]
• Verfasst von: Broska, Alexander [VerfasserIn]
• Verfasst von: Tegeder, Petra [VerfasserIn]
• Titel: Excitonic states in Narrow armchair graphene nanoribbons on gold surfaces
• Verf.angabe: Christopher Bronner, David Gerbert, Alexander Broska, and Petra Tegeder
• E-Jahr: 2016
• Jahr: October 28, 2016
• Fussnoten: Gesehen am 20.05.2020
• Titel Quelle: Enthalten in: The journal of physical chemistry <Washington, DC> / C
• Ort Quelle: Washington, DC : Soc., 2007
• Jahr Quelle: 2016
• Band/Heft Quelle: 120(2016), 45, Seite 26168-26172
• ISSN Quelle: 1932-7455
• DOI: doi:10.1021/acs.jpcc.6b10834
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1698611943

Abstract

Narrow graphene nanoribbons (GNRs) exhibit electronic and optical properties that are not present in extended graphene. Most importantly, they possess band gaps in the order of a few electron volts, which has been subject to numerous studies. Here we report on the experimental observation of exctionic states in the band gap of N = 7 armchair GNRs (7-GNR) on Au(111) and Au(788) using energy- and angle-resolved two-photon photoemission spectroscopy. Thereby, an exciton binding energy in the 7-GNR on Au(111) of 160 ± 60 meV has been determined. On the stepped Au(788) surface, the exciton binding energy is in the same range.