Dynamics of optical injection of charge and spin currents in quantum wells
Dynamics of optical injection of charge and spin currents in quantum wells
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量子阱中电荷和自旋电流的光注入动力学
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
B. Deveaud
中科院分区：
文献类型：
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作者：
D. Marti;M. Dupertuis;B. Deveaud
我们发展了一个动力学理论的光学注入的电荷和自旋电流起源于两个相干激光脉冲之间的频率ω和2 ω的干涉。推导了包含单光子和双光子带间跃迁的多带Bloch方程。他们还占交流斯塔克位移和子带间双光子跃迁。该模型用于描述对称GaAs/AlGaAs量子阱中随时间变化的电荷和自旋电流注入的情况。还与散装情况进行了比较。的人口和子带间相干的电荷电流和太赫兹发射的单独贡献被确定。计算并讨论了斯塔克位移和价带间双光子跃迁的影响。
We develop a dynamical theory for the optical injection of charge and spin current originating from the interferences between two coherent laser pulses of frequencies omega and 2omega. Multiband Bloch equations which include one- and two-photon interband transitions are derived. They also account for ac Stark shifts and intersubband two-photon transitions. The model is used to describe the case of time-dependent charge and spin current injection in a symmetric GaAs/AlGaAs quantum well. A comparison to the bulk case is also made. The separate contributions of the populations and intersubband coherences to the charge current and THz emission are identified. The influence of the Stark shifts and the inter-valence-band two-photon transitions are calculated and discussed.