Photo-induced ionic-to-neutral phase transition in tetrathiafulvalen-p-chloranil crystals |
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Authors: | K Tanimura S Koshihara |
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Institution: | 1. Department of Physics, Nagoya University , Furo-cho, Chikusa, Nagoya , 464-8602 , Japan;2. E-mail: tanimura@sanken.osaka-u.ac.jp;3. Department of Applied Physics , Tokyo Institute of Technology , 2-12-1 Oh-okayama, Meguro, 152-8551 , Tokyo;4. Kanagawa Academy of Science and Technology (KAST) , KSP Building, 3-2-1 Sakado, Takatsu, Kawasaki , 213-0012 , Japan |
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Abstract: | Recent experimental results are reviewed of the transformation between ionic and neutral phases in tetrathiafulvalen-p-chloranil crystals, induced by exciting the electronic states of the crystal. Spectroscopic studies have revealed that N phase domains are formed in the ionic-host crystal only above threshold-excitation intensity in the case of charge-transfer excitation; the threshold intensity depends strongly on the wavelength. On the other hand, N-phase domains can be formed without threshold in the excitation intensity in the case of intra-molecular excitation. Also, femtosecond time-resolved study has shown the intensity-dependent dynamics of the N-phase domain formation, and revealed the presence of short-lived intermediate states prior forming the N-phase domain. The mechanism of the photo-induced phase transition in this crystal is discussed based on these results. |
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Keywords: | TTF-CA Ionic-to-neutral phase transition Spectroscopic study Dynamics of phase transition |
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