数理物理学研究室　研究業績

原著論文　国際会議　トップページへ戻る

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原著論文

• Superconfined antiferromagnons on the two-dimensional Penrose lattice.
  T. Inoue and S. Yamamoto:
  Crystals 16, No. 6, 370, 1-22 (2026).
• Raman characterization of two-dimensional quasiperiodic antiferromagnets on various lattices: Spin-orbit mechanism.
  T. Inoue and S. Yamamoto:
  J. Phys. Soc. Jpn. 95, No. 6, 064706, 1-10 (2026) arXiv:2604.25401.
• Breakdown of the conventional spin-wave dynamics and its double-constraint modification in the spin-$\frac{1}{2}$ triangular-prism Heisenberg antiferromagnet.
  S. Yamamoto and J. Ohara:
  Europhys. Lett. 151, No. 3, 36003, 1-7 (2025),
  arXiv:2507.07463 (more readable with much larger figures).
• Photoproduction of loop currents in coronene isomers without any applied magnetic field.
  J. Ohara and S. Yamamoto:
  Solids 5, No. 4, 640-650 (2024).
• Magnon confinement on the two-dimensional Penrose lattice: Perpendicular-space analysis of the dynamic structure factor (Feature Paper).
  S. Yamamoto and T. Inoue:
  Crystals 14, No. 8, 702, 1-26 (2024).
• Thermal features of Heisenberg antiferromagnets on edge- versus corner-sharing triangular-based lattices: A message from spin waves.
  S. Yamamoto and J. Ohara:
  J. Phys. Commun. 7, No. 6, 065004, 1-34 (2023).
• Topological characterization of Kitaev spin nanoribbons with ordered flux configurations.
  R. Tadokoro and S. Yamamoto:
  JPS Conf. Proc. 38, 011160, 1-6 (2023).
• Multimagnon-mediated Raman scattering in two-dimensional quasiperiodic Heisenberg antiferromagnets.
  S. Yamamoto and J. Ohara:
  J. Phys.: Conf. Ser. 2461, No. 1, 012012, 1-8 (2023).
• Polarized Raman response of two-dimensional quasiperiodic antiferromagnets:
  Configuration-interaction versus Green’s function approaches.
  T. Inoue and S. Yamamoto:
  J. Phys. Soc. Jpn. 91, No. 5, 053701, 1-5 (2022) arXiv:2204.00345.
• Photoinduced bidirectional magnetism against monodirectional electronics
  in square-antiprismatic octacyanometalates (Editors’ Choice).
  J. Ohara and S. Yamamoto:
  J. Phys. Soc. Jpn. 89, No. 9, 093706, 1-5 (2020) arXiv:2008.00411.
• Projective symmetry group analysis of inelastic light scattering in Kitaev spin balls.
  T. Kimura and S. Yamamoto:
  Phys. Rev. B 101, No. 21, 214411, 1-18 (2020) arXiv:2005.05679.
• Raman scattering polarization and single spinon identification in two-dimensional Kitaev quantum spin liquids.
  S. Yamamoto and T. Kimura:
  J. Phys. Soc. Jpn. 89, No. 6, 063701, 1-5 (2020) arXiv:2005.05678.
• Optical observation of fermionic partons in Kitaev spin balls.
  S. Yamamoto and T. Kimura:
  J. Phys.: Conf. Ser. 1220, No. 1, 012003, 1-4 (2019).
• Raman scattering mediated by Majorana fermions in Kitaev nanoribbons.
  K. Suzuki and S. Yamamoto:
  J. Phys.: Conf. Ser. 1220, No. 1, 012046, 1-4 (2019).
• Spin-wave thermodynamics of square-lattice antiferromagnets revisited.
  S. Yamamoto and Y. Noriki:
  Phys. Rev. B 99, No. 9, 094412, 1-17 (2019) arXiv:1903.03769.
• Photocontrollable mixed-valent states in platinum-halide ladder compounds.
  J. Ohara and S. Yamamoto:
  Applied Sciences 8, No.11, 2126, 1-15 (2018).
• Photoinduced itinerant ferromagnetism in copper octacyanomolybdates.
  J. Ohara and S. Yamamoto:
  J. Phys.: Conf. Ser. 868, No.1, 012013, 1-8 (2017).
• Modified spin-wave theory on low-dimensional Heisenberg ferrimagnets: A new robust formulation.
  Y. Noriki and S. Yamamoto:
  J. Phys. Soc. Jpn. 86, No. 3, 034714, 1-19 (2017).
• Antiferromagnetic order in single crystals of the S = 2 quasi-linear chain MnCl₃(bpy) (Editors’ Suggestion).
  S. Shinozaki, A. Okutani, D. Yoshizawa, T. Kida, T. Takeuchi, S. Yamamoto, O. N. Risset, D. R. Talham, M. W. Meisel and M. Hagiwara:
  Phys. Rev. B 93, No. 1, 014407, 1-6 (2016).
• Nuclear spin-lattice relaxation at field-induced level crossings in a Cr₈F₈ pivalate single crystal.
  S. Yamamoto:
  Physica B 481, 224-231 (2016).
• Photorefinement of the mixed ground state of a platinum-iodide nanotubular assembly.
  J. Ohara, L. Zhang and S. Yamamoto:
  JPS Conf. Proc. 3, 016020, 1-7 (2014).
• Photoinduced directional and bidirectional phase transitions in bistable linear polycyclic aromatic compounds.
  L. Zhang and S. Yamamoto:
  J. Phys. Soc. Jpn. 83, No. 6, 064708, 1-14 (2014).
• Phototunable magnetism in copper cctacyanomolybdate.
  J. Ohara and S. Yamamoto:
  Sci. World J. 2014, 762765, 1-13 (2014).
• NMR observations of level crossings in a Cr₈F₈ pivalate single crystal:
  The solution to the structured enhancement of 1/T₁.
  S. Yamamoto:
  J. Kor. Phys. Soc. 62, No. 12, 1797-1801 (2013).
• Symmetry argument of cyano-bridged copper-molybdenum complexes.
  J. Ohara and S. Yamamoto:
  J. Kor. Phys. Soc. 62, No. 12, 1797-1801 (2013).
• Magnetic properties of the S = 2 Heisenberg antiferromagnetic chain compound MnCl₃(bpy).
  M. Hagiwara, Y. Idutsu, Z. Honda and S. Yamamoto:
  J. Phys.: Conf. Ser. 400, No. 3, 032014, 1-4 (2012).
• Phase competition and photomagnetism in supramolecular assemblies based on cctacyanomolybdates of the square antiprism configuration.
  S. Yamamoto and J. Ohara:
  Physica Status Solidi C 9, No. 12, 2565-2569 (2012).
• Theoretical scenario for the proton NMR observation of field-induced level crossings in a single crystal of [Cr₈F₈(piv)₁₆].
  S. Yamamoto:
  J. Phys. Soc. Jpn. 81, No. 6, 063705, 1-4 (2012).
• Bottom-up realization of a porous metal-organic nanotubular assembly.
  K. Otsubo, Y. Wakabayashi, J. Ohara, S. Yamamoto, H. Matsuzaki, H. Okamoto, K. Nitta, T. Uruga and H. Kitagawa:
  Nature Mater. 10, No. 4, 291-295 (2011).
• Photoinduced structural phase transitions in polyacene.
  S. Yamamoto:
  J. Phys. Soc. Jpn. 80, No. 8, 084713, 1-13 (2011).
• Ground-state properties of a Peierls-Hubbard triangular prism. chain complexes.
  S. Yamamoto, J. Ohara and M. Ozaki:
  J. Phys. Soc. Jpn. 79, No. 4, 044709, 1-8 (2010).
• Optical distinction and photoinduced phase transition between degenerate ground statesof polyacene.
  S. Yamamoto and J. Ohara:
  Physica B 405, S365-S368 (2010).
• Phase diagram of the frustrated spin ladder.
  Toshiya Hikihara and Oleg A. Starykh:
  Phys. Rev. B 81, 064432, 1-12 (2010).
• Magnetic phase diagram of the spin-1/2 antiferromagnetic zigzag ladder.
  Toshiya Hikihara, Tsutomu Momoi, Akira Furusaki, and Hikaru Kawamura:
  Phys. Rev. B 81, 224433, 1-20 (2010).
• Photoproduction of spin and charge carriers in halogen-bridged binuclear platinum chain complexes.
  J. Ohara and S. Yamamoto:
  Europhys. Lett. 87, No. 1, 17006, 1-6 (2009).
• Optical characterization of ground states of polyacene.
  S. Yamamoto and J. Ohara:
  J. Mater. Sci.: Mater. Electron. 20, S367-S370 (2009).
• Multichanneled relaxation of halogen-bridged diplatinum chain complexes photoexcited.
  S. Yamamoto and J. Ohara:
  Phys. Status Solidi C 6, No. 1, 144-148 (2009).
• Ferromagnetism in armchair graphene nanoribbons.
  H.-H. Lin, T. Hikihara, H.-T. Jeng, B.-L. Huang, C.-Y. Mou and X. Hu:
  Phys. Rev. B 79, 035405, 1-9 (2009).
• Photoproduction of spin and charge carriers in halogen-bridged binuclear platinum chain complexes.
  S. Yamamoto and J. Ohara:
  J. Phys.: Condens. Matter 20, No. 41, 415215, 1-9 (2008).
• Optical characterization of ground states of polyacene.
  S. Yamamoto:
  Phys. Rev. B 78, No. 23, 235205, 1-7 (2008).
• Magnetic phase diagram of spin-1/2 two-leg ladder with four-spin ring exchanges.
  T. Hikihara and S. Yamamoto:
  J. Phys. Soc. Jpn. 77, 014709, 1-9 (2008).
• Vector chiral and multipolar orders in the spin-1/2 frustrated ferromagnetic chain in magnetic field.
  Toshiya Hikihara, Lars Kecke, Tsutomu Momoi, and Akira Furusaki:
  Phys. Rev. B 78, 144404, 1-19 (2008).
• Low-energy structure of the intertwining double-chain ferrimagnets A₃Cu₃(PO₄)₄ (A=Ca,Sr,Pb).
  S. Yamamoto and J. Ohara:
  Phys. Rev. B 76, No. 1, 014409, 1-8 (2007).
• Optical characterization of platinum-halide ladder compounds.
  S. Yamamoto and J. Ohara:
  Phys. Rev. B 76, No. 23, 235116, 1-8 (2007).
• Spin coupling in zigzag Wigner crystals.
  A. D. Klironomos, Julia S. Meyer, T. Hikihara, and K. A. Matveev:
  Phys. Rev. B 76, 075302, 1-11 (2007).
• Nonlinear lattice relaxation of photoexcited diplatinum-halide chain compounds.
  J. Ohara and S. Yamamoto:
  Phys. Rev. B 73, No. 4, 045122, 1-7 (2006).
• Competing ground states of metal-halide ladders.
  K. Funase and S. Yamamoto:
  J. Phys. Soc. Jpn. 75, No. 4, 044717, 1-5 (2006).
• Evidence for multimagnon-mediated nuclear spin relaxation in the intertwining double-chain ferrimagnet Ca₃Cu₃(PO₄)₄.
  S. Yamamoto, H. Hori, Y. Furukawa, Y. Nishisaka, Y. Sumida, K. Yamada, K. Kumagai, T. Asano and Y. Inagaki:
  J. Phys. Soc. Jpn. 75, No. 7, 074703, 1-5 (2006).
• Spin dynamics in molecular ring nanomagnets: Significant effect of acoustic phonons and magnetic anisotropies.
  S. Yamamoto and T. Hikihara:
  J. Phys. Soc. Jpn. 75, 103701, 1-4 (2006).
• Effects of edges in spin-1/2 bond-alternating Heisenberg chains: Matrix-product variational approach.
  K. Funase and S. Yamamoto:
  Phys. Lett. A 334, No. 2-3, 220-225 (2005).
• Photoinduced absorption spectra of halogen-bidged binuclear metal complexes: Possible contrast between R₄[Pt₂(P₂O₅H₂)₄X]･nH₂O and Pt₂(CH₃CS₂)₄I.
  J. Ohara and S. Yamamoto:
  J. Phys. Soc. Jpn. 74, No. 1, 250-253 (2005).
• Modified spin-wave theory of nuclear magnetic relaxation in one-dimensional quantum ferrimagnets: Three-magnon versus Raman processes.
  S. Yamamoto and H. Hori:
  J. Phys. Soc. Jpn. 74, Suppl., 75-79 (2005).
• Transport in gapped quantum antiferromagnets.
  T. Sakai and S. Yamamoto:
  J. Phys. Soc. Jpn. 74, Suppl., 191-195 (2005).
• Low-temperature thermodynamics of one-dimensional alternating-spin Heisenberg ferromagnets.
  S. Yamamoto and H. Hori:
  Phys. Rev. B 72, No. 5, 054423, 1-6 (2005).
• Fermionic versus bosonic descriptions of one-dimensional spin-gapped antiferromagnets.
  S. Yamamoto and K. Funase:
  Low Temp. Phys. 31, No. 8, 740-747 (2005).
• Renormalization of impurity scattering in one-dimensional interacting electron systems in magnetic field.
  T. Hikihara, A. Furusaki and K. A. Matveev:
  Phys. Rev. B 72, 035301, 1-10 (2005).
• Phase transitions in spin-orbital coupled model for pyroxene titanium oxides.
  T. Hikihara and Y. Motome:
  J. Phys. Soc. Jpn. 74, Suppl., 212-215 (2005).
• Duality relations and exotic orders in electronic ladder systems.
  T. Momoi and T. Hikihara:
  J. Phys. Soc. Jpn. 74, Suppl., 226-233 (2005).
• Effects of the electron-phonon interaction on the charge ordering in quasi-one-dimensional charge-transfer salts.
  H. Hori and S. Yamamoto,
  Synth. Met. 152, No. 1-3, 409-412 (2005).
• Transport properties of organic spin-gapped antiferromagnets.
  T. Sakai and S. Yamamoto:
  Synth. Met. 152, No. 1-3, 477-480 (2005).
• Photoinduced infrared absorption of quasi-one-dimensional halogen-bridged binuclear transition-metal complexes.
  J. Ohara and S. Yamamoto:
  J. Phys. Chem. Solids 66, No. 8, 1571-1574 (2005).
• Interplay among spin, orbital and lattice degrees of freedom in t_2g electron systems with edge-sharing network of octahedra.
  Y. Motome, H. Tsunetsugu, T. Hikihara, N. Shannon and K. Penc:
  Prog. Theor. Phys. Suppl. 159, 314-318 (2005).
• Bosonic representation of one-dimensional Heisenberg ferrimagnets.
  S. Yamamoto:
  Phys. Rev. B 69, No. 6, 064426, 1-9 (2004).
• Static and dynamic properties of antiferromagnetic Heisenberg ladders: Fermionic versus bosonic approaches.
  H. Hori and S. Yamamoto:
  J. Phys. Soc. Jpn. 73, No. 3, 549-552 (2004).
• Nuclear magnetic relaxation in the Haldane-gap antiferromagnet Ni(C₂H₈N₂)₂NO₂(ClO₄).
  S. Yamamoto and H. Hori:
  J. Phys. Soc. Jpn. 73, No. 4, 822-825 (2004).
• Nuclear spin-lattice relaxation in one-dimensional Heisenberg ferrimagnets:
  Three-magnon versus Raman processes.
  H. Hori and S. Yamamoto:
  J. Phys. Soc. Jpn. 73, No. 6, 1453-1456 (2004).
• Soliton-induced optical absorption of halogen-bridged mixed-valence binuclear metal complexes.
  J. Ohara and S. Yamamoto:
  Phys. Rev. B 70, No. 11, 115112, 1-5 (2004).
• Nuclear magnetic relaxation in the ferrimagnetic chain compound NiCu(C₇H₆N₂O₆)(H₂O)₃･2H₂O: Three-magnon scattering?
  H. Hori and S. Yamamoto:
  J. Phys.: Condens. Matter 16, No. 49, 9023-9029 (2004).
• Effects of edges in spin-1/2 bond-alternating Heisenberg chains: Matrix-product variational approach.
  K. Funase and S. Yamamoto:
  Phys. Lett. A 334, No. 2-3, 220-225 (2004).
• Correlation Amplitudes for the spin-1/2 XXZ chain in a magnetic field.
  T. Hikihara and A. Furusaki:
  Phys. Rev. B 69, 064427, 1-11 (2004).
• Boundary contributions to specific heat and susceptibility in the spin-1/2 XXZ chain.
  A. Furusaki and T. Hikihara:
  Phys. Rev. B 69, 094429, 1-5 (2004); Phys. Rev. B 70, 189902, 1-1 (2004).
• Orbital and spin interplay in spin-gap formation in pyroxene ATiSi₂O₆ (A= Na,Li).
  T. Hikihara and Y. Motome:
  Phys. Rev. B 70, 214404, 1-12 (2004).
• Spinless fermions versus spin waves in describing antiferromagnetic Heisenberg ladders.
  H. Hori and S. Yamamoto:
  J. Mag. Mag. Mat. 272-276, 269-270 (2004).
• Scalar chiral order in spin ladders with four-spin exchanges.
  T. Momoi, T. Hikihara and M. Nakamura:
  J. Mag. Mag. Mat. 272-276, 914-915 (2004).
• Nuclear spin-lattice relaxation in ferrimagnetic clusters and chains: A contrast between zero and one dimensions.
  H. Hori and S. Yamamoto:
  Phys. Rev. B 68, No. 5, 054409, 1-6 (2003).
• Quantum and thermal phase transitions in the Bechgaard salts and their analogs.
  H. Hori and S. Yamamoto:
  Synth. Met. 135-136, 557-558 (2003).
• Spin-wave description of Haldane-gap antiferromagnets.
  S. Yamamoto and H. Hori:
  J. Phys. Soc. Jpn. 72, No. 4, 769-772 (2003).
• Pressure effects on an S = 1 Haldane compound Ni(C₅H₁₄N₂)₂N₃(PF₆).
  M. Mito, H. Akama, H. Deguchi, S. Takagi, T. Kawae, K. Takeda, M. Yamashita, H. Nakao, Y. Murakami and S. Yamamoto:
  J. Phys. Soc. Jpn. 72, No. 2, 399-404 (2003).
• Possible nonlinear excitations in quasi-one-dimensional halgen-bridged binuclear metal complexes.
  S. Yamamoto:
  Phys. Rev. B 66, No. 16, 165113, 1-8 (2002).
• Fermionic description of spin-gap states of antiferromagnetic Heisenberg ladders in a magnetic field.
  H. Hori and S. Yamamoto:
  J. Phys. Soc. Jpn. 71, No. 6, 1607-1608 (2002).
• Intrinsic double-peak structure of the specific heat in low-dimensional quantum ferrimagnets.
  T. Nakanishi and S. Yamamoto:
  Phys. Rev. B 65, No. 21, 214418, 1-5 (2002).
• Re-entrant quantum phase transitions in antiferromagnetic spin-1 ladders.
  S. Yamamoto, T. Sakai and A. Koga:
  J. Phys. Soc. Jpn. 71, No. 5, 1250-1253 (2002).
• Solitons in quasi-one-dimensional binuclear metal complexes.
  S. Yamamoto:
  Mol. Cryst. Liq. Cryst. 379, 555-560 (2002).
• Halogen-bridged binuclear metal complexes under static pressure.
  Y. Eguchi and S. Yamamoto:
  Mol. Cryst. Liq. Cryst. 379, 549-554 (2002).
• Quantum phase competition in antiferromagnetic spin-1 ladders.
  S. Yamamoto, T. Sakai and A. Koga:
  Prog. Theor. Phys. Suppl. 145, 176-181 (2002).
• Pressure-induced reverse Peierls and Peierls instabilities in halogen-bridged binuclear metal complexes.
  S. Yamamoto:
  J. Phys. Chem. Solids 63, No. 8, 1489-1493 (2002).
• Soliton excitations in halogen-bridged mixed-valence binuclear metal complexes.
  S. Yamamoto and M. Ichioka:
  J. Phys. Soc. Jpn. 71, No. 1, 189-196 (2002).

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原著論文　国際会議　トップページへ戻る

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国際会議

• Possible ring exchange and chiral spin fluctuations in quasiperiodic planar antiferromagnets: Raman observations (Invited as a Keynote Speech).
  S. Yamamoto:
  The 8th Annual Conference of AnalytiX (AnalytiX-2023),
  2023. 5. 17 ~ 19, Osaka, Japan.
• Topological characterization of Kitaev spin nanoribbons with ordered flux configurations.
  R. Tadokoro and S. Yamamoto:
  The 29th International Conference on Low Temperature Physics (LT 29),
  2022. 8. 18 ~ 24, Sapporo, Japan.
• Multimagnon-mediated Raman scattering in two-dimensional quasiperiodic Heisenberg antiferromagnets.
  S. Yamamoto and J. Ohara:
  The 10th International Conference on Aperiodic Crystals (Aperiodic 2022),
  2022. 6. 20 ~ 24, Sapporo, Japan.
• Optical observation of quasiperiodic Heisenberg antiferromagnets in two dimensions.
  T. Inoue and S. Yamamoto:
  The 14th International Conference on the Structure of Non-Crystalline Materials (NCM14),
  2019. 11. 3 ~ 8, Kobe, Japan.
• Novel photomagnets Cu₂[M (CN)₈]・xH₂O (M = Mo, W): square-antiprismatic octacyanometalates (Invited).
  S. Yamamoto and J. Ohara:
  The 8th Annual World Congress of Advanced Materials (WCAM-2019),
  2019. 7. 22 ~ 24, Osaka, Japan.
• Spin-chirality-driven Raman scattering in Penrose-lattice Heisenberg antiferromagnets.
  T. Inoue and S. Yamamoto:
  Interdisciplinary Symposium for Quasicrystals and Strongly Correlated Electron Systems,
  2019. 6. 23 ~ 27, Sendai, Japan.
• Raman scattering mediated by Majorana fermions in Kitaev nanoribbons.
  K. Suzuki and S. Yamamoto:
  The 12th International Conference on Excitonic and Photonic Processes in Condensed Matter and Nano Materials (EXCON 2018),
  2018. 7. 8 ~ 13, Nara, Japan.
• Optical observation of fermionic partons in Kitaev spin balls.
  S. Yamamoto and T. Kimura:
  The 12th International Conference on Excitonic and Photonic Processes in Condensed Matter and Nano Materials (EXCON 2018),
  2018. 7. 8 ~ 13, Nara, Japan.
• Modified-spin-wave description of scattering spectra in frustrated systems (Invited).
  S. Yamamoto and J. Ohara:
  International Workshop on Frontiers in Strongly Correlated Electron System,
  2017. 10. 19 ~ 20, Sapporo, Japan.
• Photoswitching of bistable homocyclic and heterocyclic aromatic polymers (Invited).
  S. Yamamoto:
  Energy Materials Nanotechnology (EMN) Meeting on Optoelectronics 2016,
  2016. 4. 12 ~ 15, Phuket, Thailand.
• Photoinduced itinerant ferromagnetism in copper octacyanomolybdates.
  J. Ohara and S. Yamamoto:
  International Workshop on Itinerant-Electron Magnetism,
  2015. 9. 25 ~ 27, Kyoto, Japan.
• Phototunable magnetism in octacyano-bridged bimetallic assemblies (Invited).
  S. Yamamoto and J. Ohara:
  Fujihara Seminar: Real-time Dynamics of Physical Phenomena and Manipulation by External Fields,
  2014. 9. 23 ~ 27 , Tomakomai, Japan.
• Photorefinement of the mixed ground state of a platinum-iodide nanotube.
  J. Ohara, L. Zhang and S. Yamamoto:
  International Conference on Strongly Correlated Electron Systems (SCES2013),
  2013. 8. 5 ~ 9, Tokyo, Japan.
• Symmetry argument of cyano-bridged copper-molybdenum complexes.
  J. Ohara and S. Yamamoto:
  The 19th International Conference on Magnetism (ICM 2012),
  2012. 7. 8 ~ 13, Busan, South Korea.
• NMR observations of level crossings in a Cr8F8 pivalate single crystal: The solution to the structured enhancement of 1/T₁.
  S. Yamamoto:
  The 19th International Conference on Magnetism (ICM 2012),
  2012. 7. 8 ~ 13, Busan, South Korea.
• Phase competition and photomagnetism in supramolecular assemblies based on octacyanomolybdates of the square antiprism configuration.
  S. Yamamoto and J. Ohara:
  International Conference on Optical, Optoelectronic and Photonic Materials and Applications (ICOOPMA 2012),
  2012. 6. 3 ~ 7, Nara, Japan.
• Magnetic properties of the S=2 Heisenberg antiferromagnetic chain compound MnCl₃(bpy).
  M. Hagiwara, Y. Idutsu, Z. Honda and S. Yamamoto:
  The 26th International Conference on Low Temperature Physics (LT26),
  2011. 8. 10 ~ 17, Beijing, China.
• Photomagnetism in a dicopper octacyanomolybdate
  S. Yamamoto and J. Ohara:
  International Workshop on Dynamics and Manipulation of Quantum Sysytems 2010,
  2011. 2. 13 ~ 15, Tokyo, Japan.
• Entanglement entropy in 1D critical systems with open boundaries and Sinusoidal deformation.
  T. Hikihara:
  New Development of Numerical Simulations in Low-Dimensional Quantum Systems: From Density Matrix Renormalization Group to Tensor Network Formulations,
  2010. 10. 27 ~ 29, Kyoto, Japan.
• Effective Dzyalonshinski-Moriya interactions in an octanuclear chromium(III) antiferromagnetic ring: NMR observations of the quantum level crossing.
  S. Yamamoto:
  International Workshop on Statistical Physics of Quantum Systems,
  2010. 8. 2 ~ 4, Tokyo, Japan.
• Columnar dimer phase in the frustrated spin ladder.
  Toshiya Hikihara and Oleg A. Starykh:
  The international conference Highly Frustrated Magnetism 2010,
  2010. 8. 1 ~ 6, Baltimore, USA.
• A frustrated transition-metal-halide nanotube: Exotic Peierls and Mott transitions.
  J. Ohara and S. Yamamoto:
  International Conference on Science and Technology of Synthetic Metals 2010 (ICSM2010),
  2010. 7. 4 ~ 9, Kyoto, Japan.
• Photoinduced structural phase transitions in polyacene.
  S. Yamamoto:
  The 2nd International Workshop on Dynamics and Manipluation of Quantum Sysytems (DMQS 2009),
  2009. 10. 13 ~ 16, Tokyo, Japan.
• Optical distinction and photoinduced phase transition between degenerate ground states of polyacene.
  S. Yamamoto and J. Ohara:
  The 8th International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets (ISCOM2009),
  2009. 9. 12 ~ 9. 17, Niseko, Japan.
• DMRG for Tomonaga-Luttinger liquids.
  T. Hikihara:
  Workshop on Matrix Product State Formulation and Density Matrix Renormalization Group Simulations (MPS&DMRG),
  2009.8.12 ~ 8.13, Kobe, Japan.
• Nonlinear lattice dynamics of photoexcited diplatinum-halide chain compounds.
  S. Yamamoto and J. Ohara:
  The 1st International Workshop on Dynamics and Manipluation of Quantum Sysytems (DMQS 2008),
  2008. 10. 20 ~ 22, Tokyo, Japan.
• Multichanneled relaxation of halogen-bridged diplatinum chain complexes photoexcited.
  S. Yamamoto and J. Ohara:
  The 8th International Conference on Excitonic Processes in Condensed Matter (EXCON ’08),
  2008. 6. 22 ~ 6. 27, Kyoto, Japan.
• Optical response of ladder-shaped platinum-halide compounds.
  S. Yamamoto and J. Ohara:
  21st COE International Symposium on Linear Response Theory in Commemoration of Its 50th Anniversary ~ Recent Development in Equilibrium and Non-Equilibrium Response~,
  2007. 11. 5 ~ 11. 7, Tokyo, Japan.
• Effects of ring exchanges in spin ladder systems.
  T. Hikihara, S. Yamamoto, A. D. Klironomos, J. S. Meyer and K. A. Matveev:
  International Symposium on Physics of New Quantum Phases in Superclean Materials (PSM2007),
  2007. 10. 29 ~ 11. 1, Gifu, Japan.
• Ring-exchange-induced breakdown of ferrimagnetic ground states.
  J. Ohara, S. Yamamoto and T. Hikihara:
  International Symposium on Physics of New Quantum Phases in Superclean Materials (PSM2007),
  2007. 10. 29 ~ 11. 1, Gifu, Japan.
• Optical observations of new halogen-bridged platinum complexes assembled within a ladder lattice (Invited).
  S. Yamamoto and J. Ohara:
  International Conference on Optical, Optoelectronic and Photonic Materials and Applications (ICOOPMA 2007),
  2007. 7. 30 ~ 8. 3, London, England.
• Simulated lattice relaxation of photoexcited platinum-halide chains.
  J. Ohara and S. Yamamoto:
  International Conference on Science and Technology of Synthetic Metals (ICSM 2006),
  2006. 7. 2 ~ 7, Dublin, Ireland.
• Photoinduced Infrared Absorption of Quasi-One-Dimensional Halogen-Bridged Binuclear Transition-Metal Complexes.
  J. Ohara and S. Yamamoto:
  International Symposium on Quantum Condensed System,
  2004. 11. 16 ~ 19, Kashiwa, Japan.
• Dualities and current-ordered phases in strongly correlated electron systems.
  T. Hikihara and T. Momoi:
  International Conference on Strongly Correlated Electron Systems (SCES ’04),
  2004. 7. 26 ~ 7. 30, Karlsruhe, Germany.
• Transport in gapped quantum antiferromagnets (Invited).
  T. Sakai and S. Yamamoto:
  International Conference on Statistical Physics of Quantum Systems – Novel Orders and Dynamics –,
  2004. 7. 17 ~ 7. 20, Sendai, Japan.
• Modified spin-wave theory of nuclear magnetic relaxation in one-dimensional quantum ferrimagnets: Three-magnon versus Raman processes (Invited).
  S. Yamamoto and H. Hori:
  International Conference on Statistical Physics of Quantum Systems – Novel Orders and Dynamics –,
  2004. 7. 17 ~ 7. 20, Sendai, Japan
• Matrix-product variational approach to spin-1/2 ferromagnetic-antiferromagnetic alternating Heisenberg chains.
  K. Funase and S. Yamamoto:
  International Conference on Statistical Physics of Quantum Systems – Novel Orders and Dynamics-,
  2004. 7. 17 ~ 7. 20, Sendai, Japan.
• Numerical study of thermodynamic properties of NaTiSi₂O₆.
  T. Hikihara and Y. Motome:
  International Conference on Statistical Physics of Quantum Systems – Novel Orders and Dynamics –,
  2004. 7. 17 ~ 7. 20, Sendai, Japan.
• Transport properties of organic spin-gapped antiferromagnets.
  T. Sakai and S. Yamamoto:
  International Conference on Science and Technology of Synthetic Metals (ICSM 2004),
  2004. 6. 28 ~ 7. 2, Wollongong, Australia.
• Effects of the electron-phonon interaction on the charge ordering in quasi-one-dimensional charge-transfer salts.
  H. Hori and S. Yamamoto:
  International Conference on Science and Technology of Synthetic Metals (ICSM 2004),
  2004. 6. 28 ~ 7. 2, Wollongong, Australia.
• Scalar chiral ground states in the Heisenberg spin ladders with four-spin exchanges.
  T. Hikihara, T. Momoi, M. Nakamura, X. Hu:
  Annual APS (American Physical Society) March Meeting 2004,
  2004. 3. 22 ~ 3. 26, Montreal, Canada.
• Duality and Exotic Order in Correlated Electron Ladder Systems.
  T. Momoi, T. Hikihara:
  Annual APS (American Physical Society) March Meeting 2004,
  2004. 3. 22 ~ 3. 26, Montreal, Canada.
• Boundary contribution to specific heat and suceptibility in the spin-1/2 XXZ chain.
  A. Furusaki, T. Hikihara:
  Annual APS (American Physical Society) March Meeting 2004,
  2004. 3. 22 ~ 3. 26, Montreal, Canada.
• Nuclear spin-lattice relaxation in ferrimagnetic clusters and chains: A contrast between zero and one dimensions (Invited).
  S. Yamamoto and H. Hori:
  International Workshop “Physics on Nanoscale Magnets”,
  2003. 12. 1 ~ 4, Kyoto, Japan.
• Nuclear spin-lattice relaxation in one-dimensional ferrimagnets: Possibility of the three-magnon scattering process predominating.
  S. Yamamoto and H. Hori:
  Third Open Symposium on Research Project, Grant-in-Aid for Scientific Research on Priority Areas (B): Field-Induced New Quantum Phenomena in Magnetic Systems,
  2003. 11. 26 ~ 28, Kyoto, Japan.
• Spinless fermions versus spin waves in describing antiferromagnetic Heisenberg ladders.
  H. Hori and S. Yamamoto:
  The 16th International Conference on Magnetism (ICM 2003),
  2003. 7. 27 ~ 8. 1, Roma, Italy.
• New analytic approaches to antiferromagnetic spin ladders ―spinless fermions versus spin-wave bosons― (Invited).
  S. Yamamoto:
  International Symposium on New Trends of Physics,
  2003. 1. 20 ~ 23, Sapporo, Japan.
• Fermionic and bosonic descriptions of magnetic excitations in spin ladders.
  S. Yamamoto and H. Hori:
  Second Open Symposium on Research Project, Grant-in-Aid for Scientific Research on Priority Areas (B): Field-Induced New Quantum Phenomena in Magnetic Systems,
  2002. 12. 4 ~ 6, Kobe, Japan.
• Nuclear spin relaxation in Mn₁₂: A microscopic approach to nano-scale high-spin molecules.
  S. Yamamoto and T. Nakanishi:
  International Conference on Theoretical Physics (TH-2002),
  2002. 7. 22 ~ 27, Paris, France.
• Quantum and thermal phase transitions in the Bechgaard salts and their analogs.
  H. Hori and S. Yamamoto:
  International Conference on Science and Technology of Synthetic Metals 2002 (ICSM 2002),
  2002. 6. 29 ~ 7. 5, Shanghai, China.
• A microscopic theory for nano-scale cluster magnets Mn₁₂.
  T. Nakanishi and S. Yamamoto:
  First Open Symposium on Research Project, Grant-in-Aid for Scientific Research on Priority Areas (B): Field-Induced New Quantum Phenomena in Magnetic Systems,
  2002. 3. 11 ~ 13, Kashiwa, Japan.
• Fermionic description of quantized plateaux in spin ladders.
  H. Hori and S. Yamamoto:
  First Open Symposium on Research Project, Grant-in-Aid for Scientific Research on Priority Areas (B): Field-Induced New Quantum Phenomena in Magnetic Systems,
  2002. 3. 11 ~ 13, Kashiwa, Japan.
• Intrinsic double-peak structure of the specific heat in low-dimensional quantum ferrimagnets.
  S. Yamamoto:
  The 27th Annual Conference of the Middle European Cooperation in Statistical Physics (MECO-27),
  2002. 3. 7 ~ 9, Sopron, Hungary.

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