生物[2Fe-2S]团簇体系的电子自旋弛豫
Electron Spin Relaxations in Biological [2Fe-2S] Cluster System
摘要：
在固有的蛋白质环境中的[2Fe-2S]簇的相位相干弛豫时间长达$T_2\sim830-1030\pm20$ ns。这种弛豫对应于低自旋$S=1/2$状态的相对持久的相干性。对于这个生物集群，相位相干弛豫时间显着影响的核超精细相互作用的$^{14}$ N与$I=1$。在用$^{15}$ N同位素均匀标记星团环境后，$T_2$在正则取向上超过了$\sim1.1-1.4\pm0.1~μ$ s。这已经比单自旋量子位操作的持续时间长了一个数量级$\sim10-100$ ns。瞬态章动实验对应于电子自旋的相干操纵。
英文摘要：
The phase coherence relaxation times as long as $T_2\sim830-1030\pm20$ ns were measured for the [2Fe-2S] cluster in the intrinsic protein environment. This relaxation corresponds to a relatively long lasting coherence of the low-spin $S=1/2$ state. For this biological cluster, the phase coherence relaxation time was significantly affected by the nuclear hyperfine interactions of $^{14}$N with $I=1$. After labeling the cluster environments uniformly with the $^{15}$N isotope, $T_2$ exceeds $\sim1.1-1.4\pm0.1~μ$s at the canonical orientations. This is already an order of magnitude longer than the duration of a single-spin qubit manipulation $\sim10-100$ ns. The transient nutation experiment corresponds to the coherent manipulation of the electron spin.
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