Triplet-triplet decoherence in singlet fission
Triplet-triplet decoherence in singlet fission
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DOI：
10.1103/physrevb.102.035134
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发表时间：
2020-04
影响因子：
3.7
通讯作者：
M. Marcus;W. Barford
中科院分区：
文献类型：
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作者：
M. Marcus;W. Barford
单线态裂变通常被定义为具有局部三重态结构的整体单线态自旋退相干变为两个三重态，从而完成裂变过程的过程。这个过程通常被定义为松散的术语，涉及到整体状态的多样性，这里使用一个受环境相互作用影响的均匀海森堡自旋链来研究。我们介绍了量子信息理论的新结果，它可以量化双和多部系统中的相干和纠缠。这些量子效应的计算结果可以通过模型的模拟和理论方法与可观察到的东西联系起来，比如磁化和总自旋。我们证明了这些可观测值可以作为相干和纠缠度量的代理。这两种物质在两个局部三重态之间的衰变都可以被监测到，从而可以清楚地定义单线态裂变中的自旋退相干过程。
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.