Crystals 2012, 2(3), 1067-1083; doi:10.3390/cryst2031067
Review

Photoinduced Phase Transition in Strongly Electron-Lattice and Electron–Electron Correlated Molecular Crystals

1 Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro, Tokyo 152-8551, Japan 2 Tokyo Institute of Technology, 4259, Nagatsuta, Midori-ku, Yokohama 226-8502, Japan 3 Japan Science and Technology Agency PRESTO, 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan 4 Japan Science and Technology Agency, CREST, 2-12-1 Oh-okayama, Meguro, Tokyo 152-8551, Japan
* Author to whom correspondence should be addressed.
Received: 6 May 2012; in revised form: 20 June 2012 / Accepted: 16 July 2012 / Published: 27 July 2012
(This article belongs to the Special Issue Molecular Conductors)
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Abstract: Strongly electron-lattice- and electron-electron-correlated molecular crystals, such as charge transfer (CT) complexes, are often sensitive to external stimuli, e.g., photoexcitation, due to the cooperative or competitive correlation of various interactions present in the crystals. These crystals are thus productive targets for studying photoinduced phase transitions (PIPTs). Recent advancements in research on the PIPT of CT complexes, especially Et2Me2Sb[Pd(dmit)2]2 and (EDO-TTF)2PF6, are reviewed in this report. The former exhibits a photoinduced insulator-to-insulator phase transition with clearly assigned spectral change. We demonstrate how to find the dynamics of PIPT using this system. The latter exhibits a photoinduced hidden state as an initial PIPT process. Wide energy ranged time-resolved spectroscopy can probe many kinds of photo-absorption processes, i.e., intra-molecular and inter-molecular electron excitations and intramolecular and electron-molecular vibrations. The photoinduced spectral changes in these photo-absorption processes reveal various aspects of the dynamics of PIPT, including electronic structural changes, lattice structural changes, and molecular deformations. The complexities of the dynamics of the latter system were revealed by our measurements.
Keywords: photo-induced phase transition; charge order; charge separation; ultrafast spectroscopy; vibrational spectroscopy; metal-insulator transition; strongly correlated electron systems; electron-phonon interaction; Pd(dmit)2; (EDO-TTF)2PF6

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MDPI and ACS Style

Ishikawa, T.; Onda, K.; Koshihara, S.-Y. Photoinduced Phase Transition in Strongly Electron-Lattice and Electron–Electron Correlated Molecular Crystals. Crystals 2012, 2, 1067-1083.

AMA Style

Ishikawa T, Onda K, Koshihara S-Y. Photoinduced Phase Transition in Strongly Electron-Lattice and Electron–Electron Correlated Molecular Crystals. Crystals. 2012; 2(3):1067-1083.

Chicago/Turabian Style

Ishikawa, Tadahiko; Onda, Ken; Koshihara, Shin-ya. 2012. "Photoinduced Phase Transition in Strongly Electron-Lattice and Electron–Electron Correlated Molecular Crystals." Crystals 2, no. 3: 1067-1083.

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