Near-Surface ^{125}Te^{+} Spins with Millisecond Coherence Lifetime.
Near-Surface ^{125}Te^{+} Spins with Millisecond Coherence Lifetime.
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DOI：
10.1103/physrevlett.129.117701
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发表时间：
2022-09
影响因子：
8.6
通讯作者：
M. Šimėnas;James O'Sullivan;O. Kennedy;Sen Lin;S. Fearn;C. Zollitsch;Gavin Dold;T. Schmitt;P. Schüffelgen;Renbao Liu;J. Morton
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文献类型：
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作者：
M. Šimėnas;James O'Sullivan;O. Kennedy;Sen Lin;S. Fearn;C. Zollitsch;Gavin Dold;T. Schmitt;P. Schüffelgen;Renbao Liu;J. Morton
晶体基质中的杂质自旋是量子技术中有前途的组件，特别是如果它们在靠近表面和材料界面时可以保持其自旋特性。在这里，我们研究了微波领域应用的一个有吸引力的候选者，VI ^{125}Te^{+}施主的自旋注入到天然Si中的深度浅至20 nm。我们表明，表面能带弯曲可以用来将这样的近表面Te的自旋活性的Te^{+}状态，并可以进一步使用光学照明来控制Te施主的电荷状态。我们研究了自旋激活产额、自旋线宽、弛豫时间（T_{1}）和相干时间（T_{2}），并展示了零场3.5 GHz“时钟跃迁”如何将自旋相干时间延长到1 ms以上，这比其他近表面自旋系统长了一个数量级。
Impurity spins in crystal matrices are promising components in quantum technologies, particularly if they can maintain their spin properties when close to surfaces and material interfaces. Here, we investigate an attractive candidate for microwave-domain applications, the spins of group-VI ^{125}Te^{+} donors implanted into natural Si at depths as shallow as 20 nm. We show that surface band bending can be used to ionize such near-surface Te to spin-active Te^{+} state, and that optical illumination can be used further to control the Te donor charge state. We examine spin activation yield, spin linewidth, and relaxation (T_{1}) and coherence times (T_{2}) and show how a zero-field 3.5 GHz "clock transition" extends spin coherence times to over 1 ms, which is about an order of magnitude longer than other near-surface spin systems.