Photo-induced semimetallic states realised in electron-hole coupled insulators.

ABSTRACT: Using light to manipulate materials into desired states is one of the goals in condensed matter physics, since light control can provide ultrafast and environmentally friendly photonics devices. However, it is generally difficult to realise a photo-induced phase which is not merely a higher entropy phase corresponding to a high-temperature phase at equilibrium. Here, we report realisation of photo-induced insulator-to-metal transitions in Ta₂Ni(Se_1-xS_x)₅ including the excitonic insulator phase using time- and angle-resolved photoemission spectroscopy. From the dynamic properties of the system, we determine that screening of excitonic correlations plays a key role in the timescale of the transition to the metallic phase, which supports the existen

SUBMITTER: Okazaki K 

PROVIDER: S-EPMC6192982 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature