发表机构
Université de Strasbourg; CNRS; Institute of Physics, Czech Academy of Sciences; Georg-August-Universität Göttingen; Donostia International Physics Center; Ikerbasque, Basque Foundation for Science（斯特拉斯堡大学; 法国国家科学研究中心; 捷克科学院物理研究所; 哥廷根大学; 多诺斯蒂亚国际物理中心; 伊克尔巴斯克科学基金会）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过扫描隧道显微镜诱导发光成像二维锌酞菁分子晶体中的Frenkel激子，观察到从量子受限到集体带的转变，并证实边缘激子态源于体激子带的非平凡拓扑，为分子晶体中拓扑激子工程和能量传输控制提供了平台。
AI 中文摘要
集体分子激发支配着光捕获和光电材料中的能量传输。理论预测激子能带拓扑可以产生边缘束缚态，为分子系统中的直接能量流提供途径，然而实验证据尚缺乏。在此，我们利用扫描隧道显微镜诱导发光以纳米级分辨率对二维锌酞菁分子晶体中的Frenkel激子进行成像。通过改变团簇尺寸，我们观察到从离散的量子受限激发到集体激子带的转变，并直接解析其实空间波函数。我们识别出定位于晶体边缘的激子态，并通过与微观理论比较表明，它源于体激子带的动量分辨非平凡拓扑。我们的结果确立了分子晶体作为工程化拓扑激子态的平台，并提供了一种通过激子带工程控制能量传输的策略。
英文摘要
Collective molecular excitations govern energy transport in light-harvesting and optoelectronic materials. Theory predicts that excitonic band topology can generate edge-confined states, offering a route to direct energy flow in molecular systems, yet experimental evidence is lacking. Here we use scanning tunnelling microscopy-induced luminescence to image Frenkel excitons in two-dimensional zinc phthalocyanine molecular crystals with nanometer resolution. By varying cluster size, we observe the transition from discrete quantum-confined excitations to collective excitonic bands and directly resolve their real-space wavefunctions. We identify an excitonic state localized at the crystal perimeter and show, through comparison with microscopic theory, that it originates from the momentum-resolved non-trivial topology of the bulk excitonic bands. Our results establish molecular crystals as a platform for engineering topological excitonic states and provide a strategy for controlling energy transport through excitonic band engineering.
