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Original Papers

Recent Publications (Last Updated: 2017.07.24)

"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).

"Rate equation analysis on the dynamics of first-order exciton Mott transition"
F. Sekiguchi and R. Shimano,
arXiv:1704.04195 [cond-mat.mes-hall].

"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fs suggestion)

"Electromagnons in the spin collinear state of a triangular lattice antiferromagnet"
S. Seki, N. Kida, S. Kumakura, R. Shimano, and Y. Tokura,
Phys. Rev. Lett. 105, 097207 (2010).

"Room temperature terahertz electro-optic modulation by excitons in carbon nanotubes"
T. Ogawa, S. Watanabe, N. Minami, and R. Shimano,
Appl. Phys. Lett. 97, 041111 (2010).
(selected for the August 2010 issue of Virtual Journal of Nanoscale Science & Technology, Volume 22, Issue 6 (2010),
and Virtual Journal of Ultrafast Science, Volume 9, Issue 8 (2010).)

"Optical Hall effect in the integer quantum Hall regime"
Y. Ikebe, T. Morimoto, R. Masutomi, T. Okamoto, H. Aoki, and R. Shimano,
Phys. Rev. Lett. 104, 256802 (2010).

"Ultrafast photo-induced insulator-to-metal transition in the spin density wave system of
(TMTSF)2PF6"
S. Watanabe, R. Kondo, S. Kagoshima, and R. Shimano,
Physica B 405, S360-S362 (2010).

"Electromagnons in the multiferroic state of perovskite manganites with symmetric exchange striction"
Y. Takahashi, S. Ishiwata, S. Miyahara, Y. Kaneko, N. Furukawa, Y. Taguchi, R. Shimano,
and Y. Tokura,
Phys. Rev. B 81, 100413(R) (2010).

"Above-room-temperature ferroelectricity in a single-component molecular crystal"
S. Horiuchi, Y. Tokunaga, G. Giovannetti,  S. Picozzi, H. Itoh, R. Shimano, R. Kumai,
and Y. Tokura,
NATURE 463,  789-792 (2010).

"Charge-ordering-induced polar domains and domain walls in a bilayered manganite
Pr(Sr0.15Ca0.85)2Mn2O7"
H. Itoh, Y. Tokunaga, N. Kida, R. Shimano, and Y. Tokura,
Appl. Phys. Lett. 96, 032902 (2010).

"Observation of ultrafast photoinduced closing and recovery of the spin-density-wave gap in (TMTSF)2PF6"
S. Watanabe, R. Kondo, S. Kagoshima, and R. Shimano,
Phys. Rev. B 80, 220408(R) (2009). (Editorfs suggestion)
(selected for the January 2010 issue of Virtual Journal of Ultrafast Science,Volume 9, Issue1 (2010).)

"Electric-dipole-active magnetic resonance in the conical-spin magnet Ba2Mg2Fe12O12"
N. Kida, D. Okuyama, S. Ishiwata, Y. Taguchi, R. Shimano, K. Iwasa, T. Arima, and Y. Tokura,
Phys. Rev. B 80, 220406(R) (2009).

"Lattice dynamics in the ab- and bc-spiral spin-ordered states of perovskite manganites"
J. S. Lee, N. Kida, Y. Yamasaki, R. Shimano, and Y. Tokura,
Phys. Rev. B 80, 134409 (2009).

"Anisotropic polarization pi-molecular skeleton coupled dynamics in proton-displacive organic ferroelectrics"
J. Fujioka, S. Horiuchi, N. Kida, R. Shimano, and Y. Tokura,
Phys. Rev. B 80(12), 125134 (2009).

"Time-resolved formation of excitons and electron-hole droplets in Si studied using terahertz spectroscopy"
T. Suzuki and R. Shimano,
Phys. Rev. Lett. 103, 057401 (2009).

"Far-infrared optical study of electromagnons and their coupling to optical phonons in
Eu1-xYxMnO3 (x=0.1, 0.2, 0.3, 0.4, and 0.45) "
Y. Takahashi, Y. Yamasaki, N. Kida, Y. Kaneko, T. Arima, R. Shimano, and Y. Tokura,
Phys. Rev. B 79(21), 214431 (2009). (Editorfs suggestion)

"Vortex dynamics in a NbN film studied by terahertz spectroscopy"
Y. Ikebe, R. Shimano, M. Ikeda, T. Fukumura, and M. Kawasaki,
Phys. Rev. B 79, 174525 (2009).
(Selected for Virtual Journal of Applications of Superconductivity, Volume 16, No.11, (2009).)

"Systematics of electromagnons in the spiral spin-ordered states of RMnO3"
J. S. Lee, N. Kida, S. Miyahara, Y. Takahashi, Y. Yamasaki, R. Shimano, N. Furukawa,
and Y. Tokura,
Phys. Rev. B 79, 180403(R) (2009).

"Spin-density-wave gap in (TMTSF)2PF6 probed by reflection-type terahertz time domain spectroscopy",
S. Watanabe, R. Kondo, S. Kagoshima, and R. Shimano,
Phys. Stat. Solidi (b)
245, 2688 (2008)
.

"Characterization of doped silicon in low carrier density region by terahertz frequency Faraday effect",
Y. Ikebe, R. Shimano,
Appl. Phys. Lett.
92(1), 012111-1-3 (2008)
.

"Evidence for an electric dipole active continuum band of spin excitations in multiferroic TbMnO3",
Y. Takahashi, N. Kida, Y. Yamasaki, J. Fujioka, T. Arima, R. Shimano, S. Miyahara, M. Mochizuki,
N. Furukawa, and Y. Tokura,
Phys. Rev. Lett. 101, 187201(2008).

"Electrically driven spin excitation in a ferroelectric magnet DyMnO3",
N. Kida, Y. Ikebe, Y. Takahashi, J. P. He, Y. Kaneko, Y.Yamasaki, R. Shimano, T. Arima,
N. Nagaosa and Y. Tokura,
Phys. Rev. B 78, 104414 (2008). (Editor's suggestion)

"Dielectric properties of single-walled carbon nanotubes in the terahertz frequency range",
H. Nishimura, N. Minami, R. Shimano,
Appl. Phys. Lett. 91(1), 011108-1-3 (2007).

"Compact terahertz time domain spectroscopy system with diffraction-limited spatial resolution",
S. Watanabe, R. Shimano,
Rev. Sci. Instr. 78(10), 103906-1-6 (2007).

"Frequency tunable circular polarization control of terahertz radiation",
R. Shimano, H. Nishimura, T. Sato,
Jpn. J. Appl. Phys. 44 (21), L676-L678 (2005).

"Study of orthoexciton-to-paraexciton conversion in Cu2O by excitonic Lyman spectroscopy",
M. Kubouchi, K. Yoshioka, R. Shimano, A. Mysyrowicz, and M. Kuwata-Gonokami,
Phys. Rev. Lett. 94, 016403-1-4 (2005).

"Optical activity in chiral gold nanorings",
K. Jefimovs, N. Saito, Y. Ino, T. Vallius, P. Vahimaa, J. Turunen, R. Shimano, M. Kauranen,
Y. Svirko, M. Kuwata-Gonokami,
Microelectronic Engineering, 78-79, 448-451 (2005).

before 2004

Shimano Laboratory Department of Physics, School of Science, The University of Tokyo