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arXiv 2003.08143cond-mat.mes-hall
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量子拍频引起的激子能量振荡

Exciton energy oscillations induced by quantum beats

A. V. Trifonov, A. S. Kurdyubov, I. Ya. Gerlovin, D. S. Smirnov, K. V. Kavokin, I. A. Yugova, M. Aßmann, A. V. Kavokin

摘要:

在本文中,我们从实验上证明了半导体量子阱中的量子限制激子能级在激发到两个不同宇称的量子限制激子态的叠加态后的振荡能量移动。在对应于这些状态之间的量子拍频的频率处观察到振荡。我们表明,所观察到的效果是一个表现的激子密度振荡在真实空间中的赫兹偶极子的动力学类似。这种效应是由激子-激子交换相互作用引起的,并且只有当激子处于叠加量子态时才会出现。从而为量子拍频相干过程中的非相干交换相互作用找到了明确的证据。这种效应可以用于需要状态的量子相干性的量子技术。

英文摘要:

In this paper, we experimentally demonstrate an oscillating energy shift of quantum-confined exciton levels in a semiconductor quantum well after excitation into a superposition of two quantum confined exciton states of different parity. Oscillations are observed at frequencies corresponding to the quantum beats between these states. We show that the observed effect is a manifestation of the exciton density oscillations in the real space similar to the dynamics of a Hertzian dipole. The effect is caused by the exciton-exciton exchange interaction and appears only if the excitons are in a superposition quantum state. Thus, we have found clear evidence for the incoherent exchange interaction in the coherent process of quantum beats. This effect may be harnessed for quantum technologies requiring the quantum coherence of states.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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