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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Molecular Electronics and Excited State Properties I
CPP 12.2: Talk
Monday, March 18, 2024, 16:30–16:45, H 0106
Singlet Fission Born Quintet and Triplet States for Quantum Technologies — •Naitik Panjwani1, Kanad Majumder2, Woojae Kim3, Soham Mukherjee4, Jieun Lee3, K.C. Krishnapriya2, Jyotishman Dasgupta5, Andrew Musser4, Satish Patil2, and Robert Bittl1 — 1Freie Universität Berlin, DE — 2Indian Institute of Science, IN — 3Yonsei University, KR — 4Cornell University, US — 5Tata Institute of Fundamental Research, IN
Molecular systems are promising candidates for quantum information technologies due to their reproducible nature and chemical tailorability. Photogenerated spin qubits are of interest as they form highly spin-polarised initial states e.g. in molecular systems undergoing singlet fission (SF), a process which can lead to both triplet and quintet states[1]. Furthermore, these states allow for optical detection[2] strategies to be implemented. We study a series of pentacene dimers with different linkers using electron paramagnetic resonance (EPR) spectroscopy. We investigate the role of linker geometry on relative spin state yields[3] and the influence of excitation wavelength on quintet sublevel populations[4]. Furthermore, we show how some dimers exhibit long-lived quintet states, examine the coherence properties, and investigate optical detectability in these dimers. Understanding the relationship between the spin properties and molecular structure will allow for realization of SF systems for quantum technologies.
[1] L.R. Weiss et al, Nature Phys., 2017, 13, 176 [2] G. Joshi et al, J. Chem. Phys., 2022, 157, 164702 [3] K. Majumder et al, J. Am. Chem. Soc. 2023, 145, 20883 [4] W. Kim et al, arXiv:2304.05432, 2023
Keywords: Singlet Fission; Triplet State; Quintet State; Electron Paramagnetic Resonance Spectroscopy