Detecting electron-phonon coupling during photoinduced phase transition

Photoinduced phase transitions have been intensively studied owing to their promising potential for next-generation devices. Here, the authors develop a novel analysis method: so-called frequency-domain ARPES (FDARPES). They extend well established measurement method of time-domain detect how electrons are interacting with phonons during photoinduced insulator-to-metal transition Ta${}_{2}$NiSe${}_{5}$. successfully unravel underlying nature transition. This has general applicability other transitions, including magnetism or superconductivity.