DOI: https://doi.org/10.29363/nanoge.emlem.2023.002
Publication date: 18th August 2023
At the most fundamental level, transport of energy carriers in the solid state is determined by their wavefunctions and the interactions with the environment. The transport of excitons in colloidal quantum dot (QD) solids plays a pivotal role for their optoelectronic and quantum information applications. However, the investigations of exciton transport in colloidal QD solids thus far primarily exist in the classical diffusive regime. In this study, we demonstrate unambiguous signatures of quantum transport in perovskite quantum dots superlattices with delocalized excitons. By directly imaging exciton propagation with high spatial and temporal resolutions over a wide temperature range, we elucidated the interplay between coupling, Anderson localization, and dephasing. Our experimental results directly confirm two important theoretical predictions. Firstly, we observed ballistic motions within the coherence length at low temperatures, highlighting the role of quantum effects in disordered systems. Secondly, we provided direct evidence for environment-assisted quantum transport by identifying a peak in the long-time diffusion constant at a temperature where disorder and environmental dephasing are perfectly balanced. These results provide a fundamental understanding of quantum transport in disordered systems and offer guidelines for designing quantum materials using perovskite QDs as building blocks.
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