论文标题
单石墨烯纳米纤维中的拓扑定位激子
Topologically localized excitons in single graphene nanoribbons
论文作者
论文摘要
使用扫描隧道显微镜（STM）方法，通过原子尺度的空间分辨率探测了在金属表面上合成的原子精确石墨烯纳米纤维（GNR）的激发子发射。将GNR转移到部分绝缘表面的基于STM的策略用于防止金属底物对丝带进行光发射淬火。亚纳米分辨出STM诱导的荧光光谱揭示了局部黑暗激子的发射，建立在GNR的拓扑终端状态下。一个低频振动发射梳，其特性随GNR长度而变化归因于纵向声学模式，仅限于有限的盒子。总体而言，我们的研究提供了一种新的途径，可以研究原子精确的石墨烯纳米结构中激素，颤音和拓扑之间的相互作用。
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.
