研究领域
Photo-induced Cooperative Phenomena/Optical Properties of Solids
Today, our world is facing the quite large and common problem to find the way for overcoming the limitation of the energy and other resources. For achieving continuous and sustainable development, it is the key to realize the materials which can convert the infinite light energy into various forms such as chemicals, electricity, magnetic response and mechanical energies with high efficiency. In addition, it is also the essential and common problem for the field of telecommunication and photonic computation, because such materials are also expected to show ultrafast photonic response such as dramatic color change to external stimulations by weak light.
To realize such photonic materials showing chemical, electronic and photonic responses to weak light excitation with ultrafast response time, it is a key to utilize interactions among constituents. The purpose of our research laboratory is to contribute into physical and chemical foundations of cooperative phenomena triggered by photo-excitation. This class of exotic photo-effect can be named as a photo-induced phase transition (PIPT) and is analogous to the domino effect as shown in Fig.1.
The very recent progress in the study on electronic (spin)-structural transformations in molecular systems has stressed the importance of cooperativity among constituents of materials. This opens the way for controlling the switching by external field (light, magnetic,...) between different states and/or phases by virtue of cooperative interactions. Therefore it becomes an attractive and realistic target for materials science to search for multistable organic and inorganic systems accompanied with the changes in structural, magnetic, transport, optical, dielectric properties which can be controlled by light stimulations. In addition, the dynamics and kinetics of the phase transformation in this class of material is important not only for materials science and its application but also for the basic research on the (nonequilibrium) statistical physics and chemistry.
We are also devoting our efforts for developing the facilities to probe the structural changes induced by light excitation in atomic and molecular scales with pico(10-12) and femto(10-15) second time resolution under collaboration with big facilities such as synchrotron (SR).
近期论文
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Desheng Fu, H.Taniguchi, M.Itoh, S.Koshihara, N.Yamamoto, and S.Mori"Relaxor Pb(Mg1/3Nb2/3)O3 : A Ferroelectric with Multiple Inhomogeneities", Physical Review Letters, 103, 207601 (2009) asia materials reserch highlight?f?U, 10.1103/PhysRevLett.103.207601
S. Nozawa, T.Sato, Mattheu Chollet, K. Ichiyanag, A. Tomita, H. Fujii, S.Adachi and S.Koshihara,"Direct probing of spin state dynamics coupled with electronic and structural modifications by picosecond time-resolved XAFS", Journal of the American Chemical Society, 132, 61-63(2010), 10.1021/ja907460b
Desheng Fu, Mitsuru Itoh and Shin-ya Koshihara"Invariant lattice strain and polarization in BaTiO3-CaTiO3 solid solution", J.Phys.: Condens. Matter 22 (2010) 052204, 10.1088/0953-8984/22/5/052204
A.Tomita, T.Sato, S.Nozawa, S.Koshihara, and S. Adachi"Tracking ligand-migration pathways of carbonmonoxy myoglobin in crystals at cryogenic temperatures", Acta Crystallogaphica Section A (2010) A66, 220-228, 10.1107/S0108767309050752
X.F.Shao, Y.Nakano, G.Saito, K.Yakushi, S.Koshihara, K.Tanaka, and H.Yamochi"The effect of a methyl group incorporated in EDO-TTF", Physica B, Vol.405 (2010) pp.S75-78, 10.1016/j.physb.2009.10.046
K.Onda, M.Shimizu, F.Sakaguchi, S.Ogihara, T.Ishikawa, Y.Okimoto, S.Koshihara, X.F.Shao, Y.Nakano, H.Yamochi and G.Saito"Ultrafast and large reflectivity change by ultraviolet excitation of the metallic phase in the organic conductor (EDO-TTF)2PF6", Physica B, 405, (2010) pp.S350-S352., 10.1016/j.physb.2009.11.054
A.Tomita, U.Kreutzer, S.Adachi, S.Koshihara and T.Jue"It's hollow: the function of pores within myoglobin", J. Exp. Biol. 213 (2010) pp.2748-2754., 10.1242/jeb.042994
Laurent Gu?rin, Johan H?bert, Marylise Buron-Le Cointe, et al."Capturing one-dimensional precursors of a photoinduced transformation in a material", Physical Review Letters, 105, 246101 (2010), 10.1103/PhysRevLett.105.246101
Philip Coppens, Mateusz Pitak, Milan Gembicky, Marc Messerschmidt, Stephan Scheins, Jason Benedict, Shin-ichi Adachi, Tokushi Sato, Shunsuke Nozawa, Kohei Ichiyanagi, Matthieu Chollet and Shin-ya Koshihara"The RATIO Method for Time-Resolved Laue Crystallography", Journal of Synchrotron Radiation, (2009) 16, 226-230, 10.1107/S0909049508040892
Ayana Tomita, Tokushi Sato, Kouhei Ichiyanagi, Shunsuke Nozawa, Hirohiko Ichikawa, Matthieu Chollet, Fumihiro Kawai, Sam-Yong Park,?@Takayuki Tsuduki, Takahisa Yamamoto, Shin-ya Koshihara, and Shin-ichi Adachi"Visualizing breathing motion of internal cavities in concert with ligand migration in myoglobin", PNAS 2009 106, 2612-2616, Feb.9,2009, 10.1073/pnas.0807774106
Ryoko Tazaki, Desheng Fu, Mitsuru Itoh, Masahiro Daimon, and Shin-ya Koshihara"Lattice distortion under an electric field in BaTiO3 piezoelectric single crystal", Journal of Physics.: Condens Matter 21 (2009) 215903(4pp) 1-4, 10.1088/0953-8984/21/21/215903
Yoichi Okimoto, Xianzhou Peng, Mieko Tamura, Takaaki Morita, Ken Onda, Tadahiko Ishikawa, Shin-ya Koshihara, Naoyuki Todoroki, Toru Kyomen, and Mitsuru Itoh"Ultrasonic Propagation of a Metallic Domain in Pr0.5Ca0.5CoO3 Undergoing a Photoinduced Insulator-Metal Transition", Physical Review Letters 103, 027402, July 2009, 10.1103/PhysRevLett.103.027402
M.Lorenc, J.Hebert, N.Moisan, E.Trzop, M.Servol, M.Buron, H.Cailleau, M.L.Boillot, E.Pontecorvo, M.Wulff, S.Koshihara and E.Collet"Successive Dynamical Steps of Photoinduced Switching of a Molecular Fe(III) Spin-Crossover Material by Time-Resolved X-Ray Diffraction", Physical Review Letters 103, 028301, July 2009, 10.1103/PhysRevLett.103.028301
T. Ishikawa, N. Fukazawa, Y.Matsubara, R. Nakajima, K.Onda, Y.Okimoto,?@S.Koshihara, M.Lorenc, E. Collet, M.Tamura and R. Kato"Large and ultrafast photoinduced reflectivity change in the charge separated phase of?@Et2Me2Sb[Pd(1,3-dithiol-2-thione-4,5-dithiolate)2]2", Physical Review B 80, 115108(2009), 10.1103/PhysRevB.80.115108
Desheng Fu, H.Taniguchi, M.Itoh, S.Koshihara, N.Yamamoto, and S.Mori"Relaxor Pb(Mg1/3Nb2/3)O3 : A Ferroelectric with Multiple Inhomogeneities", Physical Review Letters, 103, 207601 (2009), 10.1103/PhysRevLett.103.207601
Desheng Fu, M.Itoh, and S.Koshihara"Dielectric, ferroelectric and piezoelectric behaviors of AgNbO3-KNbO3 solid solution", the Journal of Applied Physics 106, 104104 (2009), 10.1063/1.3259410
Tokushi Sato, Shunsuke Nozawa, Kohei Ichiyanagi, Ayana Tomita, Matthieu Chollet, Hirohiko Ichikawa, Hiroshi Fujii, Shin-ichi Adachi and Shin-ya Koshihara"Capturing molecular structural dynamics by 100-picosecond time-resolved X-ray absorption spectroscopy", journal of Synchrotron Radiation, (2009) 16, 110-115, 10.1107/S0909049508034596
K.Ichiyanagi, T.Sato, S.Nozawa, K.H.Kim, J.H.Lee, J.Choi, A.Tomita, H.Ichikawa, S.Adachi, H.Ihee and S.Koshihara"100-picosecond time-resolved solution scattering utilizing wide-bandwidth Xray beam from multilayer optics", journal of Synchrotron Radiation,(2009) 16, 391-394, 10.1107/S0909049509005986
T.Ishikawa, N.Fukazawa, Y.Matsubara, R.Nakajima, K.Onda, Y.Okimoto, S.Koshihara, M.Tamura, R.Kato, M.Lorenc and E.Collet"The photo-induced phase transition in Et2Me2Sb[Pd(dmit)2]2", Physica Status Solidi ( c ), Vol.6, No.1, 112-115(2009), 10.1002/pssc.200879835
K. Onda, S. Ogihara, T. Ishikawa, Y. Okimoto, X.F. Shao, Y. Nakano, H. Yamochi, G. Saito and S. Koshihara,"Anomalous photo-induced response by double-pulse excitation in the organic conductor (EDO-TTF)2PF6", J. Phys. Conf. Ser. (2009) 148, 012002, 10.1088/1742-6596/148/1/012002
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