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首页> 外文期刊>Physica status solidi, B. Basic research >Photocurrent spectroscopy of InAs/GaAs self-assembled quantum dots
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Photocurrent spectroscopy of InAs/GaAs self-assembled quantum dots

机译:InAs / GaAs自组装量子点的光电流光谱

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A photocurrent spectroscopic study of InAs/GaAs sell-assembled quantum dots is reported. Under an applied electric field an asymmetry of the quantum confined Stark effect is observed, implying that the dots possess a permanent dipole moment. For zero field the sign of this dipole requires the hole wavefunction to lie above that of the electron, contrary to the predictions of all recent calculations. Comparison with a theoretical model shows that the correct dipole sign can only be reproduced if the dots are of a non-pyramidal shape and contain a non-zero and non-uniform Ga content. Photocurrent spectroscopy is used to determine the absorption and modal gain of dots incorporated into a laser structure. [References: 18]
机译:报道了InAs / GaAs出售组装的量子点的光电流光谱研究。在施加电场的情况下,观察到量子限制的斯塔克效应的不对称性,这意味着这些点具有永久的偶极矩。对于零场,该偶极子的符号要求空穴波函数高于电子的空穴波函数,这与所有最新计算的预测相反。与理论模型的比较表明,只有当点具有非金字塔形形状并且包含非零且不均匀的Ga含量时,才能复制正确的偶极子符号。光电流光谱法用于确定掺入激光结构中的点的吸收和模态增益。 [参考:18]

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