@article{CTT100903127, author = {Samiran Banu and Mone Kato and Kou Takubo and Yoichi Okimoto and Shin-ya Koshihara and Kaoru Iwano and Wataru Kosaka and Hitoshi Miyasaka and Tadahiko Ishikawa}, title = {Appearance of a Photoinduced Hidden State in the Electron Donor–Acceptor Type Metal–Organic Framework (NPr4)2[Fe2(Cl2An)3]}, journal = {Advanced Optical Materials}, year = 2023, } @article{CTT100903128, author = {Akihiro Sugisawa and Tsugumi Umanodan and Koubu U and Tadahiko Ishikawa and Shin-ya Koshihara and Sachio Horiuchi and Yoichi Okimoto}, title = {Ultrafast variation of the polarized state in proton-π electron coupled ferroelectric cocrystal Phz-H2ca}, journal = {Materials Advances}, year = 2023, } @article{CTT100894970, author = {Koubu U and Yoichi Okimoto and Atsuya Morita and Shiyuhei Shimanuki and Kou Takubo and Tadahiko Ishikawa and Shin-ya Koshihara and Ryusei Minakami and Hirotake Itoh and Shinichiro Iwai and Naoshi Ikeda and Takumi Sakagami and Mayu Nozaki and Tatsuo Fujii}, title = {Nonlinear Optical Properties in an Epitaxial YbFe2O4 Film Probed by Second Harmonic and Terahertz Generation}, journal = {Materials}, year = 2023, } @article{CTT100894971, author = {Yoichi Okimoto and Peiyu Xia and Jiro Itatani and Haruka Matsushima and Tadahiko Ishikawa and Shin-ya Koshihara and Sachio Horiuchi}, title = {Ultrafast opto-protonics in a hydrogen-bonded π-molecular ferroelectric crystal}, journal = {APL Materials}, year = 2022, } @article{CTT100886716, author = {Shiori Kihara and Yuki Sakai and Shogo Wakazaki and Takumi Nishikubo and Takehiro Koike and Ko Mibu and Hongwu Yu and Yoichi Okimoto and Shin-ya Koshihara and Masaki Azuma}, title = {Bi0.5Pb0.5FeO3 with Unusual Pb Charge Disproportionation: Indication of a Systematic Charge Distribution Change in Bi0.5Pb0.5MO3 (M: 3d Transition Metal)}, journal = {Inorganic Chemistry}, year = 2022, } @article{CTT100894994, author = {Kou Takubo and Samiran Banu and Sichen Jin and Misaki Kaneko and Wataru Yajima and Makoto Kuwahara and Yasuhiko Hayashi and Tadahiko Ishikawa and Yoichi Okimoto and Masaki Hada and Shin-ya Koshihara}, title = {Generation of sub-100 fs electron pulses for time-resolved electron diffraction using a direct synchronization method}, journal = {Review of Scientific Instruments}, year = 2022, } @article{CTT100879289, author = {Shin-ya Koshihara and Tadahiko Ishikawa and Yoichi Okimoto and Ken Onda and Ryo Fukaya and Masaki Hada and Yasuhiko Hayashi and Sumio Ishihara and Tadeusz Luty}, title = {Challenges for developing photo-induced phase transition (PIPT) systems: From classical (incoherent) to quantum (coherent) control of PIPT dynamics}, journal = {Physics Reports}, year = 2022, } @article{CTT100832565, author = {Hayato Ishizaki and Hajime Yamamoto and Takumi Nishikubo and Yuki Sakai and Shogo Kawaguchi and Keisuke Yokoyama and Yoichi Okimoto and Shin-ya Koshihara and Takafumi Yamamoto and Masaki Azuma}, title = {Robust Giant Tetragonal Distortion Coupled with High-Spin Co3+ in Electron-Doped BiCoO3}, journal = {Inorganic Chemistry}, year = 2019, } @article{CTT100811148, author = {Tadahiko Ishikawa and Yohei Urasawa and Taiki Shindo and Yoichi Okimoto and Shin-ya Koshihara and Seiichi Tanaka and Ken Onda and Takaaki Hiramatsu and Yoshiaki Nakano and Koichiro Tanaka and Hideki Yamochi}, title = {Optical Study of Electronic Structure and Photoinduced Dynamics in the Organic Alloy System [(EDO-TTF)0.89(MeEDO-TTF)0.11]2PF6}, journal = {Applied Sciences}, year = 2019, } @article{CTT100747003, author = {Y. Okimoto and S. Naruse and R. Fukaya and T. Ishikawa and S. Koshihara and K. Oka and M. Azuma and K. Tanaka and H. Hirori}, title = {Ultrafast Control of the Polarity of BiCoO3 by Orbital Excitation as Investigated by Femtosecond Spectroscopy}, journal = {PHYSICAL REVIEW APPLIED}, year = 2017, } @article{CTT100760245, author = {Y. Okimoto and S. Naruse and R. Fukaya and T. Ishikawa and S. Koshihara and K. Oka and M. Azuma and K. Tanaka and H. Hirori}, title = {Ultrafast Control of the Polarity of BiCoO3 by Orbital Excitation as Investigated by Femtosecond Spectroscopy}, journal = {Physical Review Applied}, year = 2017, } @article{CTT100712321, author = {Tadahiko Ishikawa and Ryosuke Hosoda and Yoichi Okimoto and Sei'ichi Tanaka and Ken Onda and Shin-ya Koshihara and Reiji Kumai}, title = {Direct observations of the photoinduced change in dimerization in K-TCNQ}, journal = {Physical Review B}, year = 2016, } @article{CTT100712318, author = {T. Ishikawa and S. A. Hayes and S. Keskin and G. Corthey and M. Hada and K. Pichugin and A. Marx and J. Hirscht and K. Shionuma and K. Onda and Y. Okimoto and S.-y. Koshihara and T. Yamamoto and H. Cui and M. Nomura and Y. Oshima and M. Abdel-Jawad and R. Kato and R. J. D. Miller}, title = {Direct observation of collective modes coupled to molecular orbital-driven charge transfer}, journal = {Science}, year = 2015, } @article{CTT100712320, author = {Fukaya, R. and Yoichi Okimoto and M. Kunitomo and Ken Onda and Tadahiko Ishikawa and Shin-ya Koshihara and Hashimoto, H. and Ishihara, S. and A. Isayama and H. Yui and T. Sasagawa}, title = {Ultrafast electronic state conversion at room temperature utilizing hidden state in cuprate ladder system}, journal = {Nature Communications}, year = 2015, } @article{CTT100709447, author = {Tsugumi Umanodan and Tadahiko Ishikawa and Ken Onda and Shin-ya Koshihara and Yoichi Okimoto}, title = {Different Time-Scale Relaxation Dynamics in Organic Supramolecular Ferroelectrics Studied by Linear and Nonlinear Spectroscopy}, journal = {Journal of the Physical Society of Japan}, year = 2015, } @article{CTT100712322, author = {Yoshitaka Matsubara and Sho Ogihara and Jiro Itatani and Nobuya Maeshima and Kenji Yonemitsu and Tadahiko Ishikawa and Yoichi Okimoto and Shin-ya Koshihara and Takaaki Hiramatsu and Yoshiaki Nakano and H. Yamochi and Gunzi Saito and Ken Onda}, title = {Coherent dynamics of photoinduced phase formation in a strongly correlated organic crystal}, journal = {Physical Review B}, year = 2014, } @article{CTT100804907, author = {Hayes, S.A. and Ishikawa, T. and Keskin, S. and Hada, M. and Marx, A. and Corthey, G. and Pichugin, K. and Nomura, M. and Kato, R. and Onda, K. and Yoichi Okimoto and Koshiharab, S. and Miller, R.J.D.}, title = {Observation of the photoinduced phase transition in Me4P[Pt(dmit)2]2 by femtosecond electron diffraction}, journal = {Optics InfoBase Conference Papers}, year = 2014, } @article{CTT100712346, author = {Ryo Fukaya and Yoichi Okimoto and Miyako Kunitomo and Tadahiko Ishikawa and Ken Onda and Shin-ya Koshihara and A. Isayama and Takao Sasagawa}, title = {Unconventional Photonic Change of Charge-Density-Wave Phase in Two-Leg Ladder Cuprate Sr14Cu24O41}, journal = {Journal of the Physical Society of Japan}, year = 2013, } @article{CTT100658187, author = {Yoichi Okimoto and Tsugumi Egawa and Ryo Fukaya and Yoshitaka Matsubara and Yuki Yamada and Nao Yamada and Tadahiko Ishikawa and Ken Onda and Shin-ya Koshihara and Hiroki Taniguchi and Mitsuru Itoh and Akira Isayama and Takao Sasagawa}, title = {Ultrafast Real Space Dynamics of Photoexcited State in a Layered Perovskite-Type Spin Crossover Oxide La1:5Sr0:5CoO4}, journal = {Journal of the Physical Society of Japan}, year = 2013, } @article{CTT100712347, author = {Naoto Fukazawa and Takahiro Tanaka and Tadahiko Ishikawa and Yoichi Okimoto and Shin-ya Koshihara and Takashi Yamamoto and Masafumi Tamura and Reizo Kato and Ken Onda}, title = {Time-Resolved Infrared Vibrational Spectroscopy of the Photoinduced Phase Transition of Pd(dmit)2 Salts Having Different Orders of Phase Transition}, journal = {The Journal of Physical Chemistry C}, year = 2013, } @article{CTT100648919, author = {R. Fukaya and M. Kunitomo and Y. Okimoto and T. Ishikawa and K. Onda and S. Koshihara and H. Yui and T. Sasagawa}, title = {Ultrafast Dynamics of Photoinduced Electronic Phase Modulation in Ladder Cuprate of Sr14-xCaxCu24O41}, journal = {Acta Physica Polonica A}, year = 2012, } @article{CTT100648918, author = {T. Egawa and Y. Okimoto and R. Fukaya and K. Onda and T. Ishikawa and S.-Y. Koshihara and A. Isayama and T. Sasagawa}, title = {Femtosecond Reflection Spectroscopy in La1.5Sr0.5CoO4}, journal = {Acta Physica Polonica A}, year = 2012, } @article{CTT100638595, author = {K. Seko and Y. Okimoto and M. Kurashima and R. Fukaya and T. Egawa and T. Ishikawa and K. Onda and S.-Y. Koshihara and T. Kyomen and M. Itoh}, title = {Photoinduced Phase Transition in Pr0:5Ca0:5CoO3 Studied by Sequential Pulse Excitations}, journal = {Acta Physica Polonica A}, year = 2012, } @article{CTT100709473, author = {Tadahiko Ishikawa and Makoto Kitayama and Aya Chono and Ken Onda and Yoichi Okimoto and Shin-ya Koshihara and Yoshiaki Nakano and H. Yamochi and Morikawa, T. and Takashi Shirahata and Yohji Misaki}, title = {Probing the metal-insulator phase transition in the. DMEDO-EBDT2PF6 single crystal by optical measurements}, journal = {Journal of Physics-Condensed Matter}, year = 2012, } @article{CTT100709488, author = {Yoichi Okimoto and Miyata, T. and Endo, M. S. and Kurashima, M. and Onda, K. and Ishikawa, T. and Shin-ya Koshihara and Lorenc, M. and Collet, E. and Cailleau, H. and Arima, T.}, title = {Ultrafast spectral weight transfer in RBaCo2O6-delta (R = Sm, Gd, and Tb): Role of electronic correlation in a photoinduced phase transition}, journal = {Physical Review B}, year = 2011, } @article{CTT100620239, author = {Y. Okimoto and M. Kurashima and K. Seko and T. Ishikawa and K. Onda and S. Koshihara and T. Kyomen and M. Itoh}, title = {Acceleration of Domain Wall Movement by Photoirradiation in Perovskite-type Cobaltite}, journal = {Physical Review B}, year = 2011, } @article{CTT100804446, author = {Onda, K. and Ogihara, S. and Itatani, J. and Ishikawa, T. and Yoichi Okimoto and Koshihara, S. and Shao, X. and Nakano, Y. and Yamochi, H. and Saito, G.}, title = {Photoinduced dynamics of a quasi-1D organic conductor over a range from 10 fs to 100 ps}, journal = {Optics InfoBase Conference Papers}, year = 2010, } @article{CTT100591959, author = {T. Ishikawa and N. Fukazawa and Y. Matsubara and R. Nakajima and K. Onda and Y. Okimoto and S. Koshihara and M. Lorenc and E. Collet and M. Tamura and R. Kato}, title = {Large and ultrafast photoinduced reflectivity change in the charge separated phase of Et2Me2Sb[Pd(1,3-dithiol-2-thione-4,5-dithiolate)2]2}, journal = {Physical Review B}, year = 2009, } @article{CTT100560788, author = {Yoichi Okimoto}, title = {Ultrafast Photoinduced Formation of Metallic State in a Perovskite-type Manganite with Short Range Charge and Orbital Order}, journal = {Journal of Physical Society of Japan}, year = 2007, } @article{CTT100532651, author = {S. Iwai and Y Ishige and S. Tanaka and Y. Okimoto and Y. Tokura and H. Okamoto}, title = {Coherent Control of Charge and Lattice Dynamics in a Photoinduced Neutral-to-Ionic Transition of a Charge-Transfer Compound}, journal = {Physical Review Letters}, year = 2006, } @article{CTT100532653, author = {S. Miyasaka and J. Fujioka and M. Iwama and Y. Okimoto and Y. Tokura}, title = {Raman study of spin and orbital order and excitations in perovskite-type RVO3 (R=La, Nd, and Y)}, journal = {Physical review B}, year = 2006, } @article{CTT100532652, author = {H. Odaka and Y. Okimoto and T. Yamada and M. Kawasaki and H. Okamoto and Y. Tokura}, title = {Control of magnetic-field effect on electroluminescence in Alq3-based organic light emitting diodes}, journal = {Applied Physics Letters}, year = 2006, } @article{CTT100532656, author = {Y. Tomioka and Y. Okimoto and J.H. Jung and R. Kumai and Y. Tokura}, title = {Phase diagrams of perovskite-type manganese oxides}, journal = {Journal of Physics and Chemistry of Solids}, year = 2006, } @article{CTT100532655, author = {R. Kumai and S. Horiuchi and Y. Okimoto and Y. Tokura}, title = {Thermochromism and Large Dielectric Susceptibility: Proton Transfer in a Supramolecular Structure of Chloranilic Acid and 5,5’-Dimethyl-2,2’-Bipyridine}, journal = {Journal of Chemical Physics}, year = 2006, } @article{CTT100532654, author = {Novel Sr2TMO3 (TM=Ni and Co) compounds with one-dimensional TM-O chains’ and M. Ohtani and H. Kishida and K. Hirota and H. Sakurada and J. Matsuno and Y. Okimoto and T. Makino and Y. Segawa and Y. Tokura and H. Okamoto and M. Kawasaki}, title = {Novel Sr2TMO3 (TM=Ni, Co) compounds with one-dimensional TM-O chains}, journal = {Advanced Materials}, year = 2006, } @article{CTT100560786, author = {Yoichi Okimoto}, title = {Far-Infrared Optical Response of Neutral-Ionic Phase Transition in an Organic Charge-Transfer Complex}, journal = {Physical Review Letters}, year = 2001, } @article{CTT100560785, author = {Yoichi Okimoto}, title = {Optical study of Pr1-xCaxMnO3 (x=0.4) in a magnetic field: Variation of electronic structure with charge ordering and disordering transitions}, journal = {Physical Review B}, year = 1999, } @article{CTT100560783, author = {Yoichi Okimoto}, title = {Variation of electronic structure in La1-xSrxMnO3 (0