Triplet-Triplet Decoherence in Singlet Fission
arXiv:2004.01058 · doi:10.1103/PhysRevB.102.035134
Abstract
Singlet fission is commonly defined to involve a process by which an overall singlet state with local triplet structure spin-decoheres into two triplet states, thereby completing the fission process. This process, often defined in loose terms involving the multiplicity of the overall state, is investigated here using a uniform Heisenberg spin-chain subject to a dephasing environmental interaction. We introduce new results from quantum information theory which enables the quantification of coherence and entanglement in a bi- and multipartite system. The calculated measures of these quantum effects can be linked to observables, such as magnetisation and total spin, with simulations of the model and using theoretical methods. We demonstrate that these observables can act as a proxy for the coherence and entanglement measures. The decay of both of these between the two local triplets can be monitored, enabling a clear definition of the spin-decoherence process in singlet fission.
arXiv comment15 pages, 11 figures
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Cited by in corpus (4)
- Optical projection and spatial separation of spin entangled triplet-pairs from the S1 (21Ag-) state of pi-conjugated systems
- Higher energy triplet-pair states in polyenes and their role in intramolecular singlet fission
- Twisted carotenoids do not support efficient intramolecular singlet fission in the orange carotenoid protein
- Optimisation of ultrafast singlet fission in 1D rings towards unit efficiency