Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.003
Publication date: 22nd December 2022
The full blossoming of quantum technologies requires the availability of easy-to-prepare materials where quantum coherences can be effectively initiated, controlled, and exploited, preferably at ambient conditions. Solid-state multilayers of colloidally grown quantum dots (QDs) are highly promising for this task because of the possibility of assembling networks of electronically coupled QDs through the modulation of sizes, inter-dot linkers, and distances. [1–3]
In this work, the coherent dynamics of solid-state multilayers of electronically coupled colloidally grown CdSe QDs are explored by two-dimensional electronic spectroscopy (2DES). 2DES techniques have been developed starting from the beginning of 2000, and historically they have been mainly exploited for the investigation of subtle dynamic mechanisms of energy and charge transport in biological complexes. Only later, these techniques have been recognized to be particularly valuable also for the study of transport processes in artificial nanomaterials and nanodevices. [4] In particular, recently proposed ‘action-based techniques’ appear particularly suited to address coherent dynamics in real functioning devices. [5]
In this work, we present the study of semiconductor nanocrystals (‘quantum dots’) in solid-state devices by different variants of 2DES: (i) the fully noncollinear optically detected BOXCARS configuration and (ii) the fully collinear photocurrent detected setup. The time evolution of coherent superposition of states was captured at ambient conditions in both cases. We thus provide important evidence for inter-dot coherences in such solid-state materials, opening up new avenues for the effective application of these materials in
quantum technologies. [6]
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