Wigger Daniel, Schall Johannes, Deconinck Marielle, Bart Nikolai, Mrowiński Paweł, Krzykowski Mateusz, Gawarecki Krzysztof, von Helversen Martin, Schmidt Ronny, Bremer Lucas, Bopp Frederik, Reuter Dirk, Wieck Andreas D, Rodt Sven, Renard Julien, Nogues Gilles, Ludwig Arne, Machnikowski Paweł, Finley Jonathan J, Reitzenstein Stephan, Kasprzak Jacek
Institute of Theoretical Physics, Wrocław University of Science and Technology, 50-370 Wrocław, Poland.
School of Physics, Trinity College Dublin, Dublin 2, D02 PN40, Ireland.
ACS Photonics. 2023 May 8;10(5):1504-1511. doi: 10.1021/acsphotonics.3c00108. eCollection 2023 May 17.
Semiconductor quantum dot molecules are considered promising candidates for quantum technological applications due to their wide tunability of optical properties and coverage of different energy scales associated with charge and spin physics. While previous works have studied the tunnel-coupling of the different excitonic charge complexes shared by the two quantum dots by conventional optical spectroscopy, we here report on the first demonstration of a coherently controlled interdot tunnel-coupling focusing on the quantum coherence of the optically active trion transitions. We employ ultrafast four-wave mixing spectroscopy to resonantly generate a quantum coherence in one trion complex, transfer it to and probe it in another trion configuration. With the help of theoretical modeling on different levels of complexity, we give an instructive explanation of the underlying coupling mechanism and dynamical processes.
半导体量子点分子因其光学性质的广泛可调性以及与电荷和自旋物理相关的不同能量尺度覆盖范围，被认为是量子技术应用的有前途的候选者。虽然先前的工作通过传统光谱学研究了两个量子点共享的不同激子电荷复合体的隧道耦合，但我们在此报告首次展示了一种相干控制的点间隧道耦合，重点关注光学活性三重子跃迁的量子相干性。我们采用超快四波混频光谱来共振地在一个三重子复合体中产生量子相干性，将其转移到另一个三重子构型并在其中进行探测。借助不同复杂程度的理论建模，我们对潜在的耦合机制和动力学过程给出了具有启发性的解释。
