Research theme for competitive and other funds (23):
2021 - 2026 The Natural Laws of Extreme Universe--A New Paradigm for Spacetime and Matter from Q uantum Information
2021 - 2026 Quantum many-body systems and tensor networks from quantum information perspectives
2017 - 2021 Energy-scale controlling of quantum many-body systems and entanglemet renormalization
2014 - 2018 Entanglement controle in quantum many-body systems by non-local transfromation and negative sign problem
2013 - 2018 Optimization of tensor network state using higher order singular value decomposition
2011 - 2015 Theory of Novel Quantum Phenomena Created by Spin, Charge, and Chirality in the Spin Nanotube
2011 - 2014 テンソル積状態の量子エンタングルメント制御と数値くりこみ群
2011 - 2013 Quantum entanglement for tensor product states and numerical renormalization groups
2008 - 2010 強磁場の創る新奇スピン秩序状態の理論解析 研究課題
2008 - 2010 Theoretical and numerical study on anomalous quantum phenomena in the spin nanotubes
2006 - 2009 corner Hamiltonianのくりこみ群的解析
2008 - 2009 強磁場の創る新奇スピン秩序状態の理論解析
2006 - 2008 renormalization group analysis of the corner Hamiltonian
2006 - 2007 密度行列くりこみ群を用いた強磁場スピン物性の研究
2006 - 2007 密度行列くりこみ群を用いた強磁場スピン物性の研究
2005 - 2007 Theoretical and Numerical Study on Anomalous Quantum Phenomena of the Spin Nanotube
2005 - 2007 Theory of anomalous properties and novel superconductivity due to many body effects in cobalt oxides
2005 - 2006 コバルト酸化物の電子状態と超伝導の理論
2004 - 2005 Novel quantum state in a high-spin chain created by the spontaneous symmetry breaking
2002 - 2002 インターネットを利用した計算物理に関する国際共同研究の試み
1999 - 2000 低次元多体問題の理論的研究と数値くり込み群の拡張
1996 - 1999 角転送行列を用いた2次元古典格子系、1次元量子系の研究 研究課題
1998 - 1998 角転送行列を用いた2次元古典格子系、1次元量子系の研究
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Papers (111):
Toshiya Hikihara, Hiroshi Ueda, Kouichi Okunishi, Kenji Harada, Tomotoshi Nishino. Visualization of Entanglement Geometry by Structural Optimization of Tree Tensor Network. arXiv:2401.16000. 2024
Toru Sakai, Masaru Hashimoto, Tomoki Houda, Rito Furuchi, Hiroki Nakano, Kiyomi Okamoto, Kouichi Okunishi. Translational Symmetry Broken Magnetization Plateau of the Spin-1/2 Ferromagnetic and Antiferromagnetic Bond-Alternating Spin Chain with Competing Anisotropies. New Physics: Sae Mulli. 2023. 73. 1131-1134
Tôru Sakai, Kiyomi Okamoto, Kouichi Okunishi, Masaru Hashimoto, Tomoki Houda, Rito Furuchi, Hiroki Nakano. Translational symmetry broken magnetization plateau of the S=1 antiferromagnetic Heisenberg chain with competing anisotropies. Physical Review B. 2023. 108. 17
Atis Yosprakob, Jun Nishimura, Kouichi Okunishi. A new technique to incorporate multiple fermion flavors in tensor renormalization group method for lattice gauge theories. Journal of High Energy Physics. 2023. 2023. 11
Shojiro Kimura, Hiroaki Onishi, Kouichi Okunishi, Mitsuru Akaki, Yasuo Narumi, Masayuki Hagiwara, Koichi Kindo, Hikomitsu Kikuchi. Magnetic Excitation in the S=1=2 Ising-like Antiferromagnetic Chain CsCoCl3 in Longitudinal Magnetic Fields Studied by High-field ESR Measurements. JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN. 2023. 92. 9
Hiroshi Ueda, Kouichi Okunishi, Seiji Yunoki, Tomotoshi Nishino. Corner transfer matrix renormalization group analysis of the two-dimensional dodecahedron model. Physical Review E. 2020. 102. 3
Seki, Kouichi, Okunishi, Kouichi. Snapshot spectra in the world-line quantum Monte Carlo for one-dimensional quantum spin systems. 2017
Ueda Hiroshi, Okunishi Kouichi, Krcmar Roman, Gendiar Andrej, Yunoki Seiji, Nishino Tomotoshi. Phase diagram and critical property of the icosahedral model on the square lattice. Meeting Abstracts of the Physical Society of Japan. 2017. 72. 2585-2585