Original Papers

Recent Publications (Last Updated: 2018.01.25)

"Terahertz field-induced ionization and perturbed free induction decay of excitons in bulk GaAs"
Yuta Murotani, Masayuki Takayama, Fumiya Sekiguchi, Changsu Kim, Hidefumi Akiyama, and Ryo Shimano,
J. Phys. D: Appl. Phys. in press.

"Light-induced switching to a Metastable Phase in a Layered Superconductor La2-xSrxCuO4 (x=0.15)"
Kaito Tomari, Ryusuke Matsunaga, Hiroaki Niwa, Dongjoon Song, Hiroshi Eisaki, Ryo Shimano,

"Higgs mode in the d-wave superconductor Bi2Sr2CaCu2O8+x driven by an intense terahertz pulse"
Kota Katsumi, Naoto Tsuji, Yuki I. Hamada, Ryusuke Matsunaga, John Schneeloch, Ruidan D. Zhong, Genda. D. Gu, Hideo Aoki, Yann Gallais, Ryo Shimano,

"Rate Equation Analysis of the Dynamics of First-order Exciton Mott Transition"
F. Sekiguchi and R. Shimano,
J. Phys. Soc. Jpn. 86, 103702 (2017).

"Polarization-resolved terahertz third-harmonic generation in a single-crystal superconductor NbN: Dominance of the Higgs mode beyond the BCS approximation"
R. Matsunaga, N. Tsuji, K. Makise, H. Terai, H. Aoki, and R. Shimano,
Phys. Rev. B 96, 020505(R) (2017).

"Anomalous metal phase emergent on the verge of an exciton Mott transition"
F. Sekiguchi, T. Mochizuki, C. Kim, H. Akiyama, L. N. Pfeiffer, K. W. West, and R. Shimano,
Phys. Rev. Lett. 118, 067401 (2017).

"Nonlinear terahertz spectroscopy of Higgs mode in s-wave superconductors"
R. Matsnaga and R. Shimano,
Phys. Scr. 92, 024003 (2017).

"Excitonic correlation in the Mott crossover regime in Ge"
F. Sekiguchi and R. Shimano,
Phys. Rev. B 91, 155202 (2015).

"Light-induced collective pseudospin precession resonating with Higgs mode in a superconductor"
R. Matsunaga, N. Tsuji, H. Fujita, A. Sugioka, K. Makise, Y. Uzawa, H. Terai, Z. Wang, H. Aoki, and R. Shimano,
Science 345, 1145 (2014).

"Lifetime Measurement of Excitons in Si by Terahertz Time-domain Spectroscopy with High Spectral Resolution"
J. Y. Yoo and R. Shimano,
J. Infrared Milli. Terahz. Waves 35, 110 (2014).

"Higgs Amplitude Mode in the BCS Superconductors Nb1-xTixN induced by Terahertz Pulse Excitation"
R. Matsunaga, Y. I. Hamada, K. Makise, Y. Uzawa, H. Terai, Z. Wang, and R. Shimano,
Phys. Rev. Lett. 111, 057002 (2013).

"Quantum Faraday and Kerr rotations in graphene"
R. Shimano, G. Yumoto, J. Y. Yoo, R. Matsunaga, S. Tanabe, H. Hibino, T. Morimoto, and H. Aoki,
Nature Commun. 4, 1841 (2013).

"Nonequilibrium BCS state dynamics induced by intense terahertz pulses in a superconducting NbN film"
R. Matsunaga and R. Shimano,
Phys. Rev. Lett. 109, 187002 (2012).

"Chirality of matter shows up via spin excitations"
S. Bordacs, I. Kezsmarki, D. Szaller, L. Demko, N. Kida, H. Murakawa, Y. Onose, R. Shimano, T. Room, U. Nagel, S. Miyahara, N. Furukawa, and Y. Tokura,
Nature Physics 8, 734 (2012).

"Exciton Mott transition in Si revealed by terahertz spectroscopy"
T. Suzuki and R. Shimano,
Phys. Rev. Lett. 109, 046402 (2012).

"Intense Terahertz Pulse-Induced Nonlinear Responses in Carbon Nanotubes"
R. Shimano, S. Watanabe, and R. Matsunaga,
J. Infrared Milli. Terahz. Waves 33, 861 (2012).

"Magnetoelectric resonance with electromagnons in a perovskite helimagnet"
Y. Takahashi, R. Shimano, Y. Kaneko, H. Murakawa, and Y. Tokura,
Nature Physics 8, 121 (2012).

"Magnetically driven ferroelectric atomic displacements in orthorhombic YMnO3"
D. Okuyama, S. Ishiwata, Y. Takahashi, K. Yamauchi, S. Picozzi, K. Sugimoto, H. Sakai, M. Takata, R. Shimano, Y. Taguchi, T. Arima, and Y. Tokura,
Phys. Rev. B 84, 054440 (2011).

"Terahertz Faraday rotation induced by an anomalous Hall effect in the itinerant ferromagnet SrRuO3"
R. Shimano, Y. Ikebe, K. S. Takahashi, M. Kawasaki, N. Nagaosa, and Y.Tokura,
EPL 95, 17002 (2011).
Selected for inclusion in the EPL Best of 2011 collection.

"Cooling dynamics of photoexcited carriers in Si studied using optical pump and terahertz probe spectroscopy"
T. Suzuki and R. Shimano,
Phys. Rev. B 83, 085207 (2011).

"Exciton Mott transition in Si studied by terahertz spectroscopy"
R. Shimano, T. Suzuki,
Physica Status Solidi (c) (2011).

"Intense terahertz pulse induced exciton generation in carbon nanotubes"
S. Watanabe, N. Minami, and R. Shimano,
Optics Express 19, 1528 (2011); ibid., 19, 15388 (2011)..

"Optical investigation of the collective dynamics of charge-orbital density waves in layered manganites"
J. Fujioka, Y. Ida, Y. Takahashi, N. Kida, R. Shimano, and Y. Tokura,
Phys. Rev. B 82, 140409(R) (2010). (Editor