Exploring Quantum Dot Lattice Defects as Tunable Spintronic Channels

Recent work (Kumar et al., 2023) has shown that Br defects in perovskite QDs induce unconventional magnetic states. But rather than treating such defects as a nuisance, what if we intentionally harness and tune them? By combining advanced defect-engineering techniques—like controlled ion implantation or in situ growth modulation—with QDs’ inherent quantum confinement, we can create arrays where defect-induced magnetic states are purposely aligned or coupled. This strategy is distinct from simply doping QDs (Taylor & Kulik, 2021), as it leverages defect engineering for active functionality, not just property tuning. The resulting QD assemblies could serve as the basis for quantum spin filters, spin-LEDs, or even quantum logic gates, merging the worlds of optoelectronics and quantum information. The ability to externally tune these channels (e.g., via light, electric field, or temperature) further amplifies the novelty.

References:

1. Mapping the Electronic Structure Origins of Surface- and Chemistry-Dependent Doping Trends in III-V Quantum Dots. Michael G. Taylor, Heather J. Kulik (2021).
2. Lattice-Distortion-Induced Change in the Magnetic Properties in Br-Defect Host CsPbBr3 Perovskite Quantum Dots.. Virendra Kumar, H. Chauhan, V. Nagal, A. K. Hafiz, Kedar Singh (2023). Journal of Physical Chemistry Letters.