Nonlinear dynamics of quantum dot nuclear spins
Nonlinear dynamics of quantum dot nuclear spins
复制标题
量子点核自旋的非线性动力学
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
A. Imamoğlu
中科院分区：
文献类型：
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作者：
P. Maletinsky;C. Lai;A. Badolato;A. Imamoğlu
单电子自旋与量子点介观核自旋系综的耦合产生了丰富的物理现象，如非马尔可夫电子自旋退相干。通过动态核自旋极化（DNSP）或精确测量有效核磁场来控制量子点核自旋量子点中的DNSP可以通过测量Overhauser场引起的能量移动来确定量子点光致发光（PL）中的Overhauser位移。在这项工作中，我们研究了磁场依赖DNSP在一个单一的自组装量子点，位于一个门控结构，允许确定性量子点充电。
Coupling of a single confined electron-spin to a mesoscopic ensemble of nuclear spins defined by a quantum dot (QD) gives rise to rich physical phenomena such as non-Markovian electron-spin decoherence. It has been argued that controlling QD nuclear spins by carrying out either dynamical nuclear spin polarization (DNSP) or precise measurements of the effective nuclear magnetic field (Overhauser field) would prolong the electron spin coherence time and thereby enhance the prospects of implementing QD spin-based quantum information processing.The degree of DNSP in a QD can be determined by measuring the Overhauser field induced energy shift (the Overhauser shift) in the QD photoluminescence (PL). In this work, we study the magnetic field dependence of DNSP in a single self-assembled QD, located in a gated structure that allows for deterministic QD charging.