In this paper, we experimentally demonstrate an oscillating energy shift of center-of-mass 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 an electron in 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. This effect exists until the Raman coherence in the interacting excitons has decayed. This effect may be harnessed for quantum technologies requiring the quantum coherence of states.

中文翻译：

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量子拍引起的激子能量振荡

在本文中，我们通过实验证明了在激发成两个奇偶性的量子受限制的激子态的叠加之后，半导体量子阱中质子受量子限制的激子能级的振荡能移。在与这些状态之间的量子拍相对应的频率处观察到振荡。我们表明观察到的效果是真实空间中激子密度振荡的一种表现，类似于赫兹偶极子中电子的动力学。该效应是由激子-激子交换相互作用引起的，并且仅在激子处于叠加量子态时才出现。这种作用一直存在，直到相互作用的激子中的拉曼相干性减弱为止。对于需要状态量子相干性的量子技术，可以利用这种效应。