Spinnler Clemens, Zhai Liang, Nguyen Giang N, Ritzmann Julian, Wieck Andreas D, Ludwig Arne, Javadi Alisa, Reiter Doris E, Machnikowski Paweł, Warburton Richard J, Löbl Matthias C
Department of Physics, University of Basel, Klingelbergstrasse 82, 4056, Basel, Switzerland.
Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, 44780, Bochum, Germany.
Nat Commun. 2021 Nov 12;12(1):6575. doi: 10.1038/s41467-021-26875-8.
In a radiative Auger process, optical decay leaves other carriers in excited states, resulting in weak red-shifted satellite peaks in the emission spectrum. The appearance of radiative Auger in the emission directly leads to the question if the process can be inverted: simultaneous photon absorption and electronic demotion. However, excitation of the radiative Auger transition has not been shown, neither on atoms nor on solid-state quantum emitters. Here, we demonstrate the optical driving of the radiative Auger transition, linking few-body Coulomb interactions and quantum optics. We perform our experiments on a trion in a semiconductor quantum dot, where the radiative Auger and the fundamental transition form a Λ-system. On driving both transitions simultaneously, we observe a reduction of the fluorescence signal by up to 70%. Our results suggest the possibility of turning resonance fluorescence on and off using radiative Auger as well as THz spectroscopy with optics close to the visible regime.
在辐射俄歇过程中，光学衰变使其他载流子处于激发态，导致发射光谱中出现微弱的红移卫星峰。发射过程中辐射俄歇的出现直接引发了一个问题，即该过程是否可以反转：同时进行光子吸收和电子降态。然而，无论是在原子还是固态量子发射器上，都尚未证明能激发辐射俄歇跃迁。在此，我们展示了辐射俄歇跃迁的光学驱动，将少体库仑相互作用与量子光学联系起来。我们在半导体量子点中的一个三重态激子上进行实验，其中辐射俄歇和基本跃迁形成一个Λ 系统。同时驱动这两个跃迁时，我们观察到荧光信号减少了高达70%。我们的结果表明，利用辐射俄歇以及接近可见光范围的光学太赫兹光谱，有可能开启和关闭共振荧光。
