Extreme Thermal Conductivity and Chiral Phonons in Two-Dimensional Hybrid Metal Halide Perovskites

Two-dimensional hybrid organic-inorganic materials provide an exceptional platform for exploring rich physics in energy conversion, thermal management, and other applications due to their expansive chemical space and tunability. Typically, thermal conductivity and elastic modulus are positively correlated in soft materials, such as amorphous macromolecules, presenting a challenge in identifying materials that are either soft and thermally conductive or hard and thermally insulative. In this talk, I will discuss the anomalous correlation between thermal conductivity and elastic modulus observed in layered hybrid metal halide perovskites and how this phenomenon leads to extreme properties. This result is achieved through the engineering of molecular interactions between organic cations and the control of symmetry breaking and dynamic disorders. Furthermore, I will share our recent findings on the interactions between electron spins and chiral phonons in chiral materials (materials that are distinguishable from their mirror images), including two-dimensional hybrid metal halide perovskites, where chirality further enriches the underlying physics and potential applications.