Giant magnetic anisotropy energy and long coherence time of uranium substitution on defected Al2O3(0001)
Giant magnetic anisotropy energy and long coherence time of uranium substitution on defected Al2O3(0001)
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DOI：
10.1103/physrevb.102.054406
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发表时间：
2020-07
影响因子：
3.7
通讯作者：
Jie Li;Lei Gu;R. Wu
中科院分区：
文献类型：
--
作者：
Jie Li;Lei Gu;R. Wu
量子信息处理和存储等各种技术创新需要具有巨大磁各向异性能量和长相干时间的纳米磁体。基于第一性原理计算和模型分析，我们证明单个铀原子取代${\mathrm{Al}}_{2}{\mathrm{O}}_{3}(0001)$表面上的Al可能具有高结构稳定性和每个铀原子高达48 meV的大磁各向异性能量。由于磁化强度位于局域 $f$ 壳层中，并且与邻近的化学键关系不大，因此量子自旋态可以实现长达 $\ensuremath{\sim}1.6\phantom{\rule{0.16em}{0ex}}\mathrm{mS}$ 的长相干时间。这些结果提出了在量子信息时代寻找不同应用的超小型磁性单元的不同策略。
Nanomagnets with giant magnetic anisotropy energy and long coherence time are desired for various technological innovations such as quantum information procession and storage. Based on the first-principles calculations and model analyses, we demonstrate that a single uranium atom substituting Al on the ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}(0001)$ surface may have high structural stability and large magnetic anisotropy energy up to 48 meV per uranium atom. As the magnetization resides in the localized $f$ shell and is not much involved in chemical bonding with neighbors, long coherence time up to $\ensuremath{\sim}1.6\phantom{\rule{0.16em}{0ex}}\mathrm{mS}$ can be achieved for the quantum spin states. These results suggest a different strategy for the search of ultrasmall magnetic units for diverse applications in the quantum information era.