Transient dynamics of the phase transition in VO₂ revealed by mega-electron-volt ultrafast electron diffraction.

ABSTRACT: Vanadium dioxide (VO₂) exhibits an insulator-to-metal transition accompanied by a structural transition near room temperature. This transition can be triggered by an ultrafast laser pulse. Exotic transient states, such as a metallic state without structural transition, were also proposed. These unique characteristics let VO₂ have great potential in thermal switchable devices and photonic applications. Although great efforts have been made, the atomic pathway during the photoinduced phase transition is still not clear. Here, we synthesize freestanding quasi-single-crystal VO₂ films and examine their photoinduced structural phase transition with mega-electron-volt ultrafast electron diffraction. Leveraging the high signal-to-noise ratio and high temporal reso

SUBMITTER: Xu C 

PROVIDER: S-EPMC9992676 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature