Detecting electron-phonon coupling during photoinduced phase transition
Takeshi Suzuki, Yasushi Shinohara, Yangfan Lu, M. Watanabe, Jiadi Xu, Kenichi L. Ishikawa, H. Takagi, M. Nohara, Naoyuki Katayama, Hiroshi Sawa, M. Fujisawa, Teruto Kanai, Jiro Itatani, T. Mizokawa, Shik Shin, Kozo Okazaki
Abstract
Photoinduced phase transitions have been intensively studied owing to their promising potential for next-generation devices. Here, the authors develop a novel analysis method: the so-called frequency-domain ARPES (FDARPES). They extend a well established measurement method of time-domain ARPES to detect how electrons are interacting with phonons during the photoinduced insulator-to-metal transition for Ta${}_{2}$NiSe${}_{5}$. They successfully unravel the underlying nature of the photoinduced phase transition. This method has general applicability to other photoinduced phase transitions, including photoinduced magnetism or superconductivity.