Topologically Localized Vibronic Excitations in Second-Layer Graphene Nanoribbons.

Phys Rev Lett

Hefei National Research Center for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information and Quantum Physics, and New Cornerstone Science Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, China.

Published: July 2024

It is of fundamental importance to characterize the intrinsic properties, like the topological end states, in the on-surface synthesized graphene nanoribbons (GNRs), but the strong electronic interaction with the metal substrate usually smears out their characteristic features. Here, we report our approach to investigate the vibronic excitations of the topological end states in self-decoupled second-layer GNRs, which are grown using an on-surface squeezing-induced spillover strategy. The vibronic progressions show highly spatially localized distributions at the second-layer GNR ends, which can be ascribed to the decoupling-extended lifetime of charging through resonant electron tunneling at the topological end states. In combination with theoretical calculations, we assign the vibronic progressions to specific vibrational modes that mediate the vibronic excitations. The spatial distribution of each resolved excitation shows evident characteristics beyond the conventional Franck-Condon picture. Our work by direct growth of second-layer GNRs provides an effective way to explore the interplay between the intrinsic electronic, vibrational, and topological properties.

Download full-text PDF

Source
http://dx.doi.org/10.1103/PhysRevLett.133.036401DOI Listing

Publication Analysis

Top Keywords

vibronic excitations
12
topological states
12
graphene nanoribbons
8
second-layer gnrs
8
vibronic progressions
8
vibronic
5
topologically localized
4
localized vibronic
4
second-layer
4
excitations second-layer
4

Similar Publications

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!