A quantum many body model for the embedded electron spin decoherence in organic solids
A quantum many body model for the embedded electron spin decoherence in organic solids
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DOI：
10.1063/1.5124561
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发表时间：
2019-10-28
影响因子：
4.4
通讯作者：
You, Jiangyang
中科院分区：
文献类型：
--
作者：
Kveder, Marina;Rakvin, Boris;You, Jiangyang
本文提出了一个适用于低温下有机固体中嵌入电子自旋退相干的广义核自旋浴模型，该模型考虑了受阻甲基旋转隧穿的重要影响.这个新的量子多体模型，解决后，使用集团相关展开方法，预测退相干配置文件直接从质子的相对位置和甲基基团的隧道分裂输入。该模型的退相干分布充分解释了强和弱受阻甲基对嵌入电子自旋退相干的影响：前者通过增加最近邻核自旋耦合加速退相干，后者通过一种新的类禁闭机制增强相干，其中来自隧穿分裂项的非常强的核自旋耦合抑制甲基转子上的那些质子参与浴动力学。这两种类型的影响，成功地证明了实验中有代表性的有机多晶矩阵：甲基丙二酸为强受阻和乙酰胺为弱受阻甲基，分别。由AIP Publishing授权出版。
We present a generalized nuclear spin bath model for embedded electron spin decoherence in organic solids at low temperatures, which takes the crucial influence from hindered methyl group rotation tunneling into account. This new, quantum many body model, after resolved using the cluster correlation expansion method, predicts the decoherence profiles directly from the proton relative position and methyl group tunneling splitting inputs. Decoherence profiles from this model explain adequately the influence from both strongly and weakly hindered methyl groups to embedded electron spin decoherence: The former accelerates decoherence by increasing the nearest neighbor nuclear spin coupling, while the latter enhances coherence through a novel confinement like' mechanism, in which the very strong nuclear spin coupling from the tunneling splitting term suppresses those protons on the methyl rotors from participating in the bath dynamics. Both types of influences are successfully proven experimentally in representative organic polycrystalline matrices: methyl malonic acid for strongly hindered and acetamide for weakly hindered methyl groups, respectively. Published under license by AIP Publishing.