Stabilization of the electron-nuclear spin orientation in quantum dots by the nuclear quadrupole interaction
Stabilization of the electron-nuclear spin orientation in quantum dots by the nuclear quadrupole interaction
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DOI：
10.1103/physrevlett.99.037401
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发表时间：
2007-07-20
影响因子：
8.6
通讯作者：
Korenev, V. L.
中科院分区：
文献类型：
--
作者：
Dzhioev, R. I.;Korenev, V. L.
核四极相互作用消除了超精细相互作用对量子点中电子和原子核自旋相干性的限制。应变诱导的核四极相互作用抑制了自旋翻转，使自组织InP/InGaP量子点的零场动态核极化成为可能。有效核磁场的方向在空间上是固定的，从而猝灭了量子点中电子自旋的磁去极化。四极相互作用抑制了零场电子自旋退相干，对于非极化核也是如此。这些结果为核四极相互作用在纳米结构中的作用提供了一个新的视角：它延长了电子-核系统的自旋记忆。
The nuclear quadrupole interaction eliminates the restrictions imposed by hyperfine interaction on the spin coherence of an electron and nuclei in a quantum dot. The strain-induced nuclear quadrupole interaction suppresses the nuclear spin flip and makes possible the zero-field dynamic nuclear polarization in self-organized InP/InGaP quantum dots. The direction of the effective nuclear magnetic field is fixed in space, thus quenching the magnetic depolarization of the electron spin in the quantum dot. The quadrupole interaction suppresses the zero-field electron spin decoherence also for the case of nonpolarized nuclei. These results provide a new vision of the role of the nuclear quadrupole interaction in nanostructures: it elongates the spin memory of the electron-nuclear system.