Wang Haonan, Kim Heejun, Dong Duanfei, Shinokita Keisuke, Watanabe Kenji, Taniguchi Takashi, Matsuda Kazunari
Institute of Advanced Energy, Kyoto University, Uji, Kyoto, 611-0011, Japan.
Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan.
Nat Commun. 2024 Jun 8;15(1):4905. doi: 10.1038/s41467-024-48623-4.
The moiré potential serves as a periodic quantum confinement for optically generated excitons, creating spatially ordered zero-dimensional quantum systems. However, a broad emission spectrum resulting from inhomogeneity among moiré potentials hinders the investigation of their intrinsic properties. In this study, we demonstrated a method for the optical observation of quantum coherence and interference of a single moiré exciton in a twisted semiconducting heterobilayer beyond the diffraction limit of light. We observed a single and sharp photoluminescence peak from a single moiré exciton following nanofabrication. Our findings revealed the extended duration of quantum coherence in a single moiré exciton, persisting beyond 10 ps, and an accelerated decoherence process with increasing temperature and excitation power density. Moreover, quantum interference experiments revealed the coupling between moiré excitons in different moiré potential minima. The observed quantum coherence and interference of moiré exciton will facilitate potential applications of moiré quantum systems in quantum technologies.
莫尔势作为光生激子的周期性量子限制，创造了空间有序的零维量子系统。然而，莫尔势之间的不均匀性导致的宽发射光谱阻碍了对其本征性质的研究。在本研究中，我们展示了一种用于在扭曲半导体异质双层中对单个莫尔激子的量子相干和干涉进行光学观测的方法，其超越了光的衍射极限。在纳米加工后，我们从单个莫尔激子中观察到一个单一且尖锐的光致发光峰。我们的研究结果揭示了单个莫尔激子中量子相干的延长持续时间，持续超过10 ps，以及随着温度和激发功率密度增加而加速的退相干过程。此外，量子干涉实验揭示了不同莫尔势极小值中的莫尔激子之间的耦合。所观察到的莫尔激子的量子相干和干涉将促进莫尔量子系统在量子技术中的潜在应用。
