Chiral Hybrid Perovskite Spintronics

Researchers have shown that hybrid organic-inorganic perovskites (or organometal trihalide perovskites) are not only aimed to be used in solar cell applications but also pursue a vast variety of fundamental research directions. In this talk, we will discuss the spin-optoelectronic properties of solution-processed chiral hybrid perovskites and their fundamental spin-dependent physical behavior in hybrid antiferromagnets. (i) We will show that the Dzyaloshinskii–Moriya-Interaction (DMI), a chiral antisymmetric exchange interaction that occurs in emergent magnetic systems with low symmetry, can be presented in layered magnetic hybrid perovskites of which the metal site, Pb is replaced by Cu. We show that layered Cu-based hybrid perovskite antiferromagnets with an interlayer DMI will lead to a strong intrinsic magnon-magnon coupling strength up to 0.24 GHz, which is four times greater than the dissipation rates of the acoustic/optical magnonic modes. (ii) We will show the observation of spintronic-Terahertz (THz) radiation in layered chiral hybrid perovskites interfaced with a ferromagnetic metal, produced by ultrafast spin current under femtosecond laser excitation. The generated THz radiation reverses its polarity depending on the chirality due to the formation of transient electric dipoles along the chiral axis produced via the chirality-induced spin selectivity effect. Our work demonstrates the great potential of hybrid perovskite-based spintronic applications by harnessing broken mirror symmetry in a highly tunable, solution-processable material platform.