Orbital-resolved imaging of coherent femtosecond exciton dynamics in coupled molecules
- URL: http://arxiv.org/abs/2507.00830v1
- Date: Tue, 01 Jul 2025 15:02:08 GMT
- Title: Orbital-resolved imaging of coherent femtosecond exciton dynamics in coupled molecules
- Authors: Yang Luo, Shaoxiang Sheng, Michele Pisarra, Caiyun Chen, Fernando Martin, Klaus Kern, Manish Garg,
- Abstract summary: Optical excitation and control of excitonic wavepackets in organic molecules is the basis to energy conversion processes.<n>Here, we demonstrate orbital-resolved imaging of optically induced coherent exciton dynamics in single copper napthalocyanine (CuNc) molecules.<n>Results reveal an ultrafast exciton coherence time of 70 fs in a single molecule, which decreases for the triplet excitons in interacting molecules.
- Score: 39.034425621567394
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Optical excitation and control of excitonic wavepackets in organic molecules is the basis to energy conversion processes. To gain insights into such processes, it is essential to establish the relationship between the coherence timescales of excitons with the electronic inhomogeneity in the molecules, as well as the influence of intermolecular interactions on exciton dynamics. Here, we demonstrate orbital-resolved imaging of optically induced coherent exciton dynamics in single copper napthalocyanine (CuNc) molecules, and selective coherent excitation of dark and bright triplet excitons in coupled molecular dimers. Ultrafast photon-induced tunneling current enabled atomic-scale imaging and control of the excitons in resonantly excited molecules by employing excitonic wavepacket interferometry. Our results reveal an ultrafast exciton coherence time of ~ 70 fs in a single molecule, which decreases for the triplet excitons in interacting molecules.
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