Dynamical nuclear decoupling of electron spins in molecular graphenoid radicals and biradicals
Dynamical nuclear decoupling of electron spins in molecular graphenoid radicals and biradicals
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DOI：
10.1103/physrevb.101.094406
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发表时间：
2020-03-03
影响因子：
3.7
通讯作者：
Bogani, Lapo
中科院分区：
文献类型：
--
作者：
Lombardi, Federico;Myers, William K.;Bogani, Lapo
我们研究了合成定制的石墨烯中的核去耦合机制，其中电子自旋态是通过对晶格的拓扑操纵来引入的。我们比较了含有一个和两个自旋中心的分子石墨烯，它们是由蜂窝晶格中的五角环引入的。利用系统的分子性质，我们研究了不同的核物种和环境的作用。对Carr-Purcell-Meiom-Gill脉冲串的变化被用来延长自由基团电子自旋的相干时间，导致性能和相干时间的显著改善，在液氮温度下，S的相干时间可达300u。对电子自旋相干性随脉冲间隔的变化的研究表明，与核旋进同相的脉冲串最大限度地促进了核去耦合。在室温下达到了样品处理和环境施加的极限，表明需要进行哪些改进才能进一步提高量子性能。
We investigate the mechanisms of nuclear decoupling in synthetically tailored graphenoids, where the electron spin state is introduced by topological manipulation of the lattice. We compare molecular graphenoids containing one and two spin centers, introduced by pentagonal rings in the honeycomb lattice. Exploiting the molecular nature of the systems, we investigate the role of different nuclear species and environments. Variations on the Carr-Purcell-Meiboom-Gill pulse trains are used to prolong the coherence time of the electron spin of the radicaloids, leading to substantial improvements in performance and coherence times up to 300 mu s at liquid-nitrogen temperature. The investigation of electron spin coherence as a function of interpulse spacing, with times close to the inverse of the nuclear precession frequency, reveals that a train of pulses in phase with the nuclear precession maximizes the nuclear decoupling. At room temperature the limits imposed by the sample treatment and environment are reached, indicating what amelioration is necessary to further enhance the quantum performance.