Title :
Photoinduced phase transitions in strongly correlated electron systems
Author :
Koshihara, Shin-ya ; Adachi, Shinichi ; Okimoto, Yoichi ; Ishikawa, Tadahiko ; Fukaya, Ryo ; Fukumoto, Keiki ; Hoshino, Manabu ; Onda, Ken
Author_Institution :
Dept. of Mater. Sci., Tokyo Inst. of Technol., Tokyo, Japan
Abstract :
The search for materials that show a phase transition triggered by weak external stimulation of light is an important and attractive target for photonic and materials science today. My talk reviews experimental evidence indicating that photo-injected local excitation can really trigger an electron-lattice coupled cooperative phenomenon named as photo-induced phase transition (PIPT: Photo-domino effect) in wide class of materials based on the dynamical x-ray technique combined with the ultrafast spectroscopy. Obtained results also demonstrate that `hidden phase´ in strongly correlated systems which never appears in the phase diagram under thermo-equilibrium condition plays an essential role for the gigantic photo-response of the strongly correlated electron systems.
Keywords :
X-ray diffraction; high-speed optical techniques; neodymium compounds; phase diagrams; solid-state phase transformations; strongly correlated electron systems; strontium compounds; thermodynamics; thin films; Nd0.5Sr0.5MnO3; dynamical X-ray technique; electron-lattice coupled cooperative phenomenon; hidden phase; materials science; phase diagram; photodomino effect; photoinduced phase transition; photoinjected local excitation; photonic science; strongly correlated electron systems; thermoequilibrium condition; thin film; ultrafast spectroscopy; weak external light stimulation; Lattices; Optical diffraction; Optical films; Optical sensors; Optical variables control; Ultrafast optics;
Conference_Titel :
Lasers and Electro-Optics (CLEO), 2012 Conference on
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4673-1839-6
