Photoinduced multistage phase transitions in Ta₂NiSe₅.

ABSTRACT: Ultrafast control of material physical properties represents a rapidly developing field in condensed matter physics. Yet, accessing the long-lived photoinduced electronic states is still in its early stages, especially with respect to an insulator to metal phase transition. Here, by combining transport measurement with ultrashort photoexcitation and coherent phonon spectroscopy, we report on photoinduced multistage phase transitions in Ta₂NiSe₅. Upon excitation by weak pulse intensity, the system is triggered to a short-lived state accompanied by a structural change. Further increasing the excitation intensity beyond a threshold, a photoinduced steady new state is achieved where the resistivity drops by more than four orders at temperature 50 K. This new state is ther

SUBMITTER: Liu QM 

PROVIDER: S-EPMC8024274 | biostudies-literature | 2021 Apr

REPOSITORIES: biostudies-literature