(142d) Engineering Spin Dephasing in Metal-Halide Perovskites for Improved Quantum Information and Spintronic Applications

Inorganic metal-halide perovskites have emerged as promising platforms for quantum information and spintronic applications, due to their large spin-orbit coupling, high photoluminescence quantum yields, photostability, and optical spin selection rules. Specifically, CsPbBr₃ nanocrystals have exhibited long optical coherence times and short photoluminescence lifetimes, initiating CsPbBr₃ nanocrystals, and the entire class of inorganic nanocrystals, as an exciting new system for single-photon emitters. While these results have highlighted the excellent emission properties of these materials, integrating metal-halide perovskites into many quantum information devices requires long spin lifetimes, known as the inhomogeneous spin dephasing time (T₂^*), for reliable transport, injection, and manipulation of individual spins. However, to date, there have been limited measurements of spin dephasing and its origin in metal-halide perovskites. Thus, there is no understanding of how to rationally engineer spin manipulation, leaving an entire class of devices left to theory.

Here, we study the spin dephasing in nanostructured metal-halide perovskites. Combining temperature- and field-dependent measurements, we describe a mechanism for spin dephasing in metal-halide perovskites. These measurements initiate metal-halide perovskites for spintronic and quantum-information applications and provide a roadmap for the future development.