Controlled Phase Transitions in In2Se3 via Laser-Induced Wrinkling.

Crystalline phase transitions in two-dimensional (2D) materials enable precise control over electronic and ferroic properties, making them attractive materials for memory and energy storage applications. In2Se3 is particularly promising because its α and β' phases are both stable at room temperature but exhibit distinct ferroic behaviors. However, achieving reliable reversible switching between these states remains challenging. Here, we show that controlled β' → α phase transitions in 2D In2Se3 become accessible through laser-induced wrinkling, establishing a room-temperature approach for manipulating ferroic states in In2Se3 thin films. Combined with thermal annealing for phase recovery, this approach eliminates cryogenic steps and mechanical perturbation while harnessing accumulated internal strain to generate multiphase heterostructures and direct domain reorganization. This pathway for phase transitions in In2Se3 opens the door for further development in ferroic device architectures and phase-change memory technologies.