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Article Dans Une Revue Physical Review Materials Année : 2023

Tunneling electronic excitations spatial mapping of a single graphene nanoribbon on Ag(111)

Umamahesh Thupakula
We-Hyo Soe
Xavier Bouju
Christian Joachim

Résumé

Using low temperature scanning tunneling microscopy (STM), spectroscopy (STS), and precise dI/dV mapping in combination with density-functional theory-parametrized semiempirical calculations, we report and discuss the origin of tunneling electronic excitations that occur along a seven-carbon-atom-wide armchair graphene nanoribbon (7-aGNR) physisorbed on Ag(111) as compared to a reference on Au(111) surface. On both surfaces, on-surface synthesized 7-aGNRs of variable lengths are selectively chosen for performing the STM and STS (dI/dV ) excitation mapping along a truly isolated molecule. For exactly the same 7-aGNR molecule length, the difference in work functions between Ag(111) and Au(111) generates different edge states electronic configuration that result in a curved molecular conformation on Ag(111) and a strictly flat one on Au(111). At the interface between the 7-aGNR and Ag(111), this curved conformation produces an additional set of quantum-box-like tunneling resonances that partially mix with the intrinsic 7-aGNR tunneling excitations.
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hal-04280750 , version 1 (11-11-2023)

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Paternité - Pas d'utilisation commerciale - Pas de modification

Identifiants

Citer

Umamahesh Thupakula, We-Hyo Soe, Xavier Bouju, Erik Dujardin, Christian Joachim. Tunneling electronic excitations spatial mapping of a single graphene nanoribbon on Ag(111). Physical Review Materials, 2023, 7 (8), pp.085005. ⟨10.1103/PhysRevMaterials.7.085005⟩. ⟨hal-04280750⟩
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