[19p-A25-1~15] 3.5 Ultrashort-pulse and high-intensity lasers

3:30 PM - 3:45 PM JST(6:30 AM - 6:45 AM UTC)English Presentation

[19p-A25-8] Monitoring small polarons and phase transitions through ultrafast Infrared spectroscopy.

〇(P)Gael Emilien Privault^1,3,2, Marius Herve^1,2, Nicolas Godin^1,2, Roman Bertoni^1,2, Shintaro Akagi³, Jacek Kubicki⁴, Masaki Hada³, Hiroko Tokoro^2,3, Shin-ichi Ohkoshi^2,5, Maciej Lorenc^1,2, Eric Collet^1,2,6 (1.Rennes Inst., 2.DYNACOM IRL 2015, 3.Tsukuba Univ., 4.Poznan Univ., 5.Tokyo Univ., 6.IUF)

Keywords:

Infrared,Ultrafast,Liquid-Jet

Controlling the phase of molecular materials at room temperature through ultra-short light irradiation, is a promising field for photonic devices. We studied the RbMnFe compound which exhibit a photoinduced inter-metallic charge-transfer phase transition and a wide thermal hysteresis centered at room temperature. The use of a streaming methodology enables us to study the out-of-equilibrium dynamics of non-reversible phenomena. Moreover, we combined this method with a femtosecond Infrared experiment, as this system phase transition involves a symmetry breaking and a volume change. This local probe allowed us to distinguish different fluence regimes, to monitor the appearance of small photo-induced charge transfer polarons and to highlight persistent phase transitions. This worked was performed with the financial support of the Agence Nationale de la Recherche, ANR-19-CE30-0004 ELECTROPHONE, ANR- 19-CE07-0027 SMAC, ANR-19-CE29-0018 MULTICROSS, as also Region Bretagne (ARED PHONONIC).