Topologically localized excitons in single graphene nanoribbons

Abstract

Excitonic emission from atomically precise graphene nanoribbons (GNRs) synthesised on a metal surface is probed with atomic-scale spatial resolution using a scanning tunneling microscopy (STM) approach. A STM-based strategy to transfer the GNRs to a partially insulating surface is used to prevent light emission quenching of the ribbons by the metal substrate. Sub-nanometer resolved STM-induced fluorescence spectra reveal emission from localized dark excitons build upon the topological end states of the GNRs. A low frequency vibronic emission comb whose characteristics change with the GNR length is attributed to longitudinal acoustic modes confined to a finite box. Overall, our study provides a novel path to investigate the interplay between excitons, vibrons and topology in atomically precise graphene nanostructures.

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• Ultrafast Charge Separation Induced by a Uniform Field in Graphene Nanoribbons
• The role of precursor coverage in the synthesis and substrate transfer of graphene nanoribbons
• Strain-enhanced edge ferromagnetism and bipolar magnetic semiconducting behavior in Janus graphene nanoribbons
• Creating quantum spin chains through edge reconstruction in pure graphene armchair nanoribbons towards ballistic spin transport
• Optical excitations in nanographenes from the Bethe-Salpeter equation and time-dependent density functional theory: absorption spectra and spatial descriptors
• Electronic and magnetic properties of graphene-fluorographene nanoribbons: Controllable semiconductor-metal transition