title: Gigantic photoresponse in 1/4-filled-band organic salt (EDO-TTF)2PF6.
abstract: We report that the organic salt (EDO-TTF)2PF6 with 3/4-filled-band (1/4-filled in terms of holes), which forms an organic metal with strong electron and lattice correlation, shows a highly sensitive response to photoexcitation. An ultrafast, photoinduced phase transition from the insulator phase to the metal phase can be induced with very weak excitation intensity at near room temperature. This response makes the material attractive for applications in switching devices with room-temperature operation. The observed photo-induced spectroscopic change shows that this photoinduced phase transition process is caused by the cooperative melting of charge ordering assisted by coherent phonon generation.
authors.affiliation: Department of Materials Science, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan.
authors.forename: Matthieu
authors.initials: M
authors.lastname: Chollet
authors.forename: Laurent
authors.initials: L
authors.lastname: Guerin
authors.forename: Naoki
authors.initials: N
authors.lastname: Uchida
authors.forename: Souichi
authors.initials: S
authors.lastname: Fukaya
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Shimoda
authors.forename: Tadahiko
authors.initials: T
authors.lastname: Ishikawa
authors.forename: Kazunari
authors.initials: K
authors.lastname: Matsuda
authors.forename: Takumi
authors.initials: T
authors.lastname: Hasegawa
authors.forename: Akira
authors.initials: A
authors.lastname: Ota
authors.forename: Hideki
authors.initials: H
authors.lastname: Yamochi
authors.forename: Gunzi
authors.initials: G
authors.lastname: Saito
authors.forename: Ryoko
authors.initials: R
authors.lastname: Tazaki
authors.forename: Shin-Ichi
authors.initials: S
authors.lastname: Adachi
authors.forename: Shin-Ya
authors.initials: SY
authors.lastname: Koshihara