Dynamical model for coherent optical manipulation of a single spin state in a charged quantum dot
Dynamical model for coherent optical manipulation of a single spin state in a charged quantum dot
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带电量子点中单自旋态的相干光学操纵的动力学模型
DOI：
10.1002/pssc.200880326
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Slavcheva G
中科院分区：
文献类型：
--
作者：
Slavcheva G
利用耦合矢量麦克斯韦-伪自旋形式化理论研究了带电量子点（QD）中单个自旋的光诱导相干自旋动力学。推导了广义伪自旋主方程，用于描述系统中自旋相干和自旋居群的时间演化，包括自旋居群转移和自旋弛豫过程的耗散。该方程与通过宏观介质偏振耦合到它的光波传播的矢量麦克斯韦方程在时域中自一致地求解。利用该模型，在低强度和高强度拉比振荡区模拟了带电量子点中电子-三角跃迁的单共振超短光激发后留下的长寿命电子自旋相干性。讨论了该模型预测的偏振光致发光（PL）特征，如激发后第二回波脉冲的出现和特征PL迹线形状，以实现高保真的单自旋偏振态相干读出方案。（©2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim）
The optically‐induced coherent spin dynamics of a single spin confined in a charged quantum dot (QD) is theoretically studied employing coupled vector Maxwell‐pseudospin formalism. Generalized pseudospin master equation is derived for description of the time evolution of spin coherences and spin populations including spin population transfer and dissipation in the system through spin relaxation processes. The equation is solved in the time domain self‐consistently with the vector Maxwell equations for the optical wave propagation coupled to it via macroscopic medium polarisation. Using the model the long‐lived electron spin coherence left behind a single resonant ultrashort optical excitation of the electron‐trion transition in a charged QD is simulated in the low‐ and high‐intensity Rabi oscillations regime. Signatures of the polarised photoluminescence (PL), predicted by the model, such as the appearance of a second echo pulse after the excitation and characteristic PL trace shape, are discussed for realization of high‐fidelity schemes for coherent readout of a single spin polarisation state. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
影响因子：
3.7
作者：
S. Economou;Renbao Liu;L. Sham;D. Steel
通讯作者：
D. Steel
影响因子：
2.9
作者：
F. T. Hioe
通讯作者：
F. T. Hioe
影响因子：
56.9
作者：
Petta, JR;Johnson, AC;Gossard, AC
通讯作者：
Gossard, AC