单电荷量子点系综中电子自旋相干性的鲁棒操纵
Robust manipulation of electron spin coherence in an ensemble of singly charged quantum dots
摘要：
利用最近报道的锁模效应，我们证明了一个高度鲁棒的控制电子自旋相干在（In，Ga）As量子点系综在单自旋相干时间。通过脉冲训练序列等激励脉冲激光协议的参数，可以完全控制横向磁场中的自旋进动，从而在法拉第旋转中产生可调节的量子拍频猝发。翻转的电子自旋旋进相位被证明是通过反转的脉冲双重序列内的极化。
英文摘要：
Using the recently reported mode locking effect we demonstrate a highly robust control of electron spin coherence in an ensemble of (In,Ga)As quantum dots during the single spin coherence time. The spin precession in a transverse magnetic field can be fully controlled up to 25 K by the parameters of the exciting pulsed laser protocol such as the pulse train sequence, leading to adjustable quantum beat bursts in Faraday rotation. Flipping of the electron spin precession phase was demonstrated by inverting the polarization within a pulse doublet sequence.
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