Updated on 2025/05/20

写真a

 
NOGAKI Kosuke
 
Organization
Academic Assembly Institute of Science and Technology Fundamental Sciences Assistant Professor
Graduate School of Science and Technology Fundamental Sciences Assistant Professor
Faculty of Science Department of Science Assistant Professor
Title
Assistant Professor
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Degree

  • Ph.D. (Science) ( 2024.3   Kyoto University )

Research Interests

  • Condensed matter physics

Research Areas

  • Natural Science / Magnetism, superconductivity and strongly correlated systems  / Heavy fermion system

Research History (researchmap)

  • Niigata University   Faculty of Science Department of Science   Assistant Professor

    2025.4

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    Country：Japan

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  • RIKEN   Center for Emergent Matter Science   Special Postdoctoral Researcher

    2024.4 - 2025.3

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    Country：Japan

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  • Kyoto University   Graduate School of Science

    2021.4 - 2024.3

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    Country：Japan

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Research History

  • Niigata University   Fundamental Sciences, Institute of Science and Technology, Academic Assembly   Assistant Professor

    2025.4

  • Niigata University   Department of Science, Faculty of Science   Assistant Professor

    2025.4

  • Niigata University   Fundamental Sciences, Graduate School of Science and Technology   Assistant Professor

    2025.4

Education

  • Kyoto University   Graduate School of Science   Division of Physics and Astronomy

    2021.4 - 2024.3

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    Country： Japan

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  • Kyoto University   Graduate School of Science   Division of Physics and Astronomy

    2019.4 - 2021.3

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    Country： Japan

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  • Kyoto University   Faculty of Science   Faculty of Science

    2015.4 - 2019.3

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    Country： Japan

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Professional Memberships

  • The Physical Society of Japan

    2020.1

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Papers

  • Field-induced superconductivity mediated by odd-parity multipole fluctuation

    Kosuke Nogaki, Youichi Yanase

    Physical Review B   110 ( 18 )   2024.11

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    Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

    DOI： 10.1103/physrevb.110.184501

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    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.110.184501/fulltext

  • Correlation-induced Fermi surface evolution and topological crystalline superconductivity in CeRh2As2

    Jun Ishizuka, Kosuke Nogaki, Manfred Sigrist, Youichi Yanase

    Physical Review B   110 ( 14 )   2024.10

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    Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

    DOI： 10.1103/physrevb.110.l140505

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    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.110.L140505/fulltext

  • Coexistence of near-𝐸𝐹 Flat Band and Van Hove Singularity in a Two-Phase Superconductor

    Xuezhi Chen, Le Wang, Jun Ishizuka, Renjie Zhang, Kosuke Nogaki, Yiwei Cheng, Fazhi Yang, Zhenhua Chen, Fangyuan Zhu, Zhengtai Liu, Jiawei Mei, Youichi Yanase, Baiqing Lv, Yaobo Huang

    Physical Review X   14 ( 2 )   2024.6

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    Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

    Quantum many-body systems, particularly, the ones with large near-EF density states, are well known for exhibiting rich phase diagrams as a result of enhanced electron correlations. The recently discovered locally noncentrosymmetric heavy fermion superconductor CeRh2As2 has stimulated extensive attention due to its unusual H−T phase diagram consisting of two-phase superconductivity, antiferromagnetic order, and possible quadrupole-density wave orders. However, the critical near-EF electronic structure remains experimentally elusive. Here, we provide this key information by combining soft-x-ray and vacuum ultraviolet (VUV) angle-resolved-photoemission-spectroscopy measurements and atom-resolved density-functional-theory (DFT)+U calculations. With bulk-sensitive soft x ray, we reveal quasi-2D hole and electron pockets near the EF. On the other hand, under VUV light, the Ce flat bands are resolved with the c−f hybridization persisting up to well above the Kondo temperature. Most importantly, we observe a symmetry-protected fourfold Van Hove singularity (VHS) coexisting with the Ce   4f5/21 flat bands at the X point, which, to the best of our knowledge, has never been reported before. Such a rare coexistence is expected to lead to a large density of states at the zone edge, a large upper critical field of the odd-parity phase, as well as spin and/or charge instabilities with a vector of (1/2, 1/2, 0). Uniquely, it will also result in a new type of f-VHS hybridization that alters the order and fine electronic structure of the VHS and flat bands. Our findings provide not only key insights into the nature of multiple phases in CeRh2As2 but also open up new prospects for exploring the novelties of many-body systems with f-VHS hybridization.

    Published by the American Physical Society 2024

    DOI： 10.1103/physrevx.14.021048

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    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevX.14.021048/fulltext

  • Magnetism and superconductivity in mixed-dimensional periodic Anderson model for UTe2

    Ryuji Hakuno, Kosuke Nogaki, Youichi Yanase

    Physical Review B   2024.3

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevB.109.104509

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  • Nevanlinna.jl: A Julia implementation of Nevanlinna analytic continuation Reviewed

    Kosuke Nogaki, Jiani Fei, Emanuel Gull, Hiroshi Shinaoka

    SciPost Physics Codebases   2023.11

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Stichting SciPost  

    We introduce a Julia implementation of the recently proposed Nevanlinna analytic continuation method. The method is based on Nevanlinna interpolants and inherently preserves the causality of a response function due to its construction. For theoretical calculations without statistical noise, this continuation method is a powerful tool to extract real-frequency information from numerical input data on the Matsubara axis. This method has been applied to first-principles calculations of correlated materials. This paper presents its efficient and full-featured open-source implementation of the method including the Hamburger moment problem and smoothing.

    DOI： 10.21468/scipostphyscodeb.19

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  • Multiscale Space-Time Ansatz for Correlation Functions of Quantum Systems Based on Quantics Tensor Trains

    Hiroshi Shinaoka, Markus Wallerberger, Yuta Murakami, Kosuke Nogaki, Rihito Sakurai, Philipp Werner, Anna Kauch

    Physical Review X   2023.4

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevX.13.021015

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  • Bosonic Nevanlinna Analytic Continuation

    Kosuke Nogaki, Hiroshi Shinaoka

    Journal of the Physical Society of Japan   2023.3

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.7566/JPSJ.92.035001

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  • sparse-ir: Optimal compression and sparse sampling of many-body propagators Reviewed

    Markus Wallerberger, Samuel Badr, Shintaro Hoshino, Sebastian Huber, Fumiya Kakizawa, Takashi Koretsune, Yuki Nagai, Kosuke Nogaki, Takuya Nomoto, Hitoshi Mori, Junya Otsuki, Soshun Ozaki, Thomas Plaikner, Rihito Sakurai, Constanze Vogel, Niklas Witt, Kazuyoshi Yoshimi, Hiroshi Shinaoka

    SoftwareX   21   101266 - 101266   2023.2

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.softx.2022.101266

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  • Even-odd parity transition in strongly correlated locally noncentrosymmetric superconductors: Application to CeRh2As2

    Kosuke Nogaki, Youichi Yanase

    Physical Review B   2022.9

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevB.106.L100504

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  • Topological crystalline superconductivity in locally noncentrosymmetric CeRh2As2

    Kosuke Nogaki, Akito Daido, Jun Ishizuka, Youichi Yanase

    Physical Review Research   2021.9

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevResearch.3.L032071

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  • Strongly parity-mixed superconductivity in the Rashba-Hubbard model

    Kosuke Nogaki, Youichi Yanase

    Physical Review B   102 ( 16 )   2020.10

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    Publishing type：Research paper (scientific journal)   Publisher：American Physical Society ({APS})  

    DOI： 10.1103/PhysRevB.102.165114

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Books

  • Quantics tensor trainに基づく多スケール時空仮説と場の量子論

    品岡 寛, 村上 雄太, 野垣 康介, 櫻井 理人（ Role： Joint author）

    日本物理学会誌2024月2号 「最近の研究から」  2024.2 

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Presentations

  • CeRh2As2の電子状態から見た超伝導

    野垣 康介

    超伝導研究の新潮流  2024.12 

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    Event date： 2024.12

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • CeRh2As2の強相関効果によるフェルミ面の変形とトポロジカル結晶超伝導

    石塚淳, 野垣康介, Manfred Sigris, 柳瀬陽一

    日本物理学会 第79回年次大会（2024年）  2024.9 

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    Event date： 2024.9

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • CeRh2As2の電子状態に基づく超伝導状態の考察

    野垣康介, 柳瀬陽一

    日本物理学会 第79回年次大会（2024年）  2024.9 

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    Event date： 2024.9

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 副格子自由度に基づく内因性磁場誘起超伝導の理論

    野垣康介, 柳瀬陽一

    日本物理学会 2024年春季大会  2024.3 

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    Event date： 2024.3

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 副格子自由度に由来する磁場誘起超伝導

    野垣康介

    京都大学基礎物理学研究所研究会「超伝導研究の発展と広がり」  2023.12 

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    Event date： 2023.12

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • The causality preserving analytic continuation based on Nevanlinna theory

    Kosuke Nogaki

    Computational Approaches to Quantum Many-Body Systems  2023.10 

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    Event date： 2023.10

    Language：English   Presentation type：Poster presentation  

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  • Nevanlinna理論に基づく新規数値解析接続法のボソン系への拡張

    野垣康介, Jiani Fei, Emanuel Gull, 品岡寛

    日本物理学会第78回年次大会  2023.9 

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    Event date： 2023.9

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 奇パリティ多極子揺らぎと磁場誘起超伝導

    野垣康介

    学術変革領域研究(A)「アシンメトリが彩る量子物質の可視化・設計・創出」トピカルミーティング 「アシンメトリ量子物質を如何に可視化するか？ 〜ミクロ測定とマクロ測定の連携による研究戦略〜」 開催趣旨  2023.8 

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    Event date： 2023.8

    Language：Japanese   Presentation type：Poster presentation  

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  • Field Reentrant Odd-parity Superconductivity in Strongly Correlated Electron Systems

    Kosuke Nogaki, Youichi Yanase

    International Conference on Strongly Correlated Electron Systems 2023  2023.7 

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    Event date： 2023.7

    Language：English   Presentation type：Poster presentation  

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  • Multi-scale Space-time Ansatz for Correlation Functions of Quantum Systems Based on Quantics Representations

    Hiroshi Shinaoka, Markus Wallerberger, Yuta Murakami, Kosuke Nogaki, Rihito Sakurai, Philipp Werner, Anna Kauch

    International Conference on Strongly Correlated Electron Systems 2023  2023.7 

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    Event date： 2023.7

    Language：English   Presentation type：Oral presentation (general)  

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  • Magnetism and Superconductivity in Mixed-dimesional Periodic Anderson Model for UTe2

    Ryuji Hakuno, Kosuke Nogaki, Youichi Yanase

    International Conference on Strongly Correlated Electron Systems 2023  2023.7 

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    Event date： 2023.7

    Language：Bengali   Presentation type：Poster presentation  

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  • Parity transition and Topological Superconductivity in strongly correlated superconductor Invited

    Kosuke Nogaki

    10th international workshop on the Dual Nature of f-electrons  2023.6 

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    Event date： 2023.6

    Language：English   Presentation type：Oral presentation (invited, special)  

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  • 量子系の相関関数に対する多スケール時空仮説

    品岡寛, Markus Wallerberger, 村上雄太, 野垣康介, 櫻井理人, Philipp Werner, Anna Kauch

    日本物理学会 2023年春季大会  2023.3 

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    Event date： 2023.3

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 混合次元周期アンダーソン模型における磁性と超伝導：UTe2への応用

    白野龍二, 野垣康介, 柳瀬陽一

    日本物理学会 2023年春季大会  2023.3 

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    Event date： 2023.3

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 局所空間反転対称性が破れた強相関電子系における奇パリティ磁気多極子揺らぎが媒介する磁場誘起超伝導の理論研究

    野垣康介, 柳瀬陽一

    日本物理学会 2023年春季大会  2023.3 

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    Event date： 2023.3

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 強相関超伝導体におけるパリティ転移とトポロジカル超伝導 Invited

    野垣康介

    非自明な電子状態で発現する超伝導現象の新しい潮流  2022.12 

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    Event date： 2022.12

    Language：Japanese   Presentation type：Oral presentation (invited, special)  

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  • Topological strongly correlated superconductor CeRh2As2

    Kosuke Nogaki

    Trends in the Theory of Quantum Materials 2022  2022.11 

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    Event date： 2022.10 - 2022.11

    Language：English   Presentation type：Oral presentation (general)  

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  • Strong correlation effect and parity transition in CeRh2As2

    Kosuke Nogaki

    29th International Conference on Low Temperature Physics  2022.8 

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    Event date： 2022.8

    Language：English   Presentation type：Poster presentation  

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  • Novel parity transition in strongly correlated superconductor: relation to CeRh2As2

    Kosuke Nogaki

    International Conference on Strongly Correlated Electron Systems 2022  2022.7 

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    Event date： 2022.7

    Language：English   Presentation type：Oral presentation (general)  

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  • 局所的に空間反転対称性が破れた強相関電子系における新奇超伝導相に関する理論研究 ～CeRh2As2の相図の理解～

    野垣康介, 柳瀬陽一

    日本物理学会 第77回年次大会  2022.3 

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    Event date： 2022.3

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • Topological crystalline superconductivity and electronic band structure of CeRh2As2 Invited

    Kosuke Nogaki

    Young investigators online workshop on unconventional superconductivity in heavy fermions  2022.1 

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    Event date： 2022.1

    Language：English   Presentation type：Oral presentation (invited, special)  

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  • CeRh2As2のトポロジカル超伝導と電子状態

    野垣康介

    非自明な電子状態が生み出す超伝導現象の最前線：新たな挑戦と展望  2021.12 

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    Event date： 2021.12

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • Topological crystalline superconductivity in locally noncentrosymmetric odd-parity superconductor CeRh2As2

    Kosuke Nogaki

    International Conference on Strongly Correlated Electron Systems 2020  2021.9 

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    Event date： 2021.9 - 2021.10

    Language：English   Presentation type：Oral presentation (general)  

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  • 局所的に空間反転対称性が破れた新奇重い電子系超伝導体CeRh2As2におけるトポロジカル結晶超伝導

    野垣康介, 大同暁人, 石塚淳, 柳瀬陽一

    日本物理学会 2021 年秋季大会  2021.9 

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    Event date： 2021.9

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 新奇重い電子系超伝導体CeRh2As2におけるトポロジカル結晶超伝導

    野垣康介

    ワークショップ(4)「超伝導物質、トポロジカル物質」  2021.3 

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    Event date： 2021.3

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • Strongly parity-mixed superconductivity in the Rashba-Hubbard model

    Kosuke Nogaki Youichi Yanase

    APS March meeting 2021  2021.3 

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    Event date： 2021.3

    Language：English   Presentation type：Oral presentation (general)  

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  • 空間反転対称性が破れた系における超伝導相

    NANOSPEC 2021 第18回 SPring-8ユーザー協同体 顕微ナノ材料科学研究会 第15回 日本表面真空学会 放射光表面化学研究部会 第4回 日本表面真空学会 プローブ顕微鏡研究部会 合同シンポジウム  2021.3 

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    Event date： 2021.3

    Language：Japanese   Presentation type：Poster presentation  

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  • Theoretical study of superconductivity in strongly correlated electron systems without inversion symmetry

    Kosuke Nogaki, Youichi Yanase

    The 33rd International Symposium on Superconductivity  2020.12 

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    Event date： 2020.12

    Language：English   Presentation type：Oral presentation (general)  

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  • 「空間反転対称性が破れた強相関電子系における強くパリティ混成した超伝導

    野垣康介

    高温超伝導・非従来型超伝導研究の最前線：多様性と普遍性  2020.10 

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    Event date： 2020.10

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 空間反転対称性の破れた強相関電子系における超伝導相の理論研究

    野垣康介, 柳瀬陽一

    日本物理学会 2020 年秋季大会  2020.9 

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    Event date： 2020.9

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 局所的な反転対称性の破れが誘起する磁気揺らぎの理論解析

    野垣康介, 柳瀬陽一

    日本物理学会 2020 年秋季大会  2020.9 

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    Event date： 2020.9

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  • Theoretical study of superconducting state in the Rashba Hubbard model

    Kosuke Nogaki, Youichi Yanase

    2020.3 

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    Event date： 2020.3

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 空間反転対称性が破れた系の磁気構造

    野垣康介

    J-Physics：多極子伝導系の物理 令和元年度領域全体会議  2020.1 

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    Event date： 2020.1

    Language：Japanese   Presentation type：Poster presentation  

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  • Rashba-Hubbar 模型の磁気揺らぎ

    野垣康介

    第27回 渦糸物理 ワークショップ  2019.12 

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    Event date： 2019.12

    Language：Japanese   Presentation type：Poster presentation  

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Awards

  • Best Poster Award

    2022.8   LT29 Organizers   Strong correlation effect and parity transition in CeRh2As2

    Kosuke Nogaki

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Research Projects

  • 拡張多極子がもたらす新奇な量子多体物理

    Grant number：24K22869

    2024.7 - 2026.3

    System name：科学研究費助成事業

    Research category：研究活動スタート支援

    Awarding organization：日本学術振興会

    野垣 康介

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    Grant amount：\2860000 （ Direct Cost: \2200000 、 Indirect Cost：\660000 ）

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  • 空間反転対称性の破れが生み出す量子多体現象の探索と解明

    Grant number：22KJ1716

    2021.4 - 2024.3

    System name：科学研究費助成事業

    Research category：特別研究員奨励費

    Awarding organization：日本学術振興会

    野垣 康介

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    Grant amount：\2200000 （ Direct Cost: \2200000 ）

    本課題の目的は、強相関電子系における新奇量子相及び量子臨界現象の解明と探索である。これらの目的は、高精度な数値計算によって達成されるため、その方法論の発展は重要な課題である。量子多体系に対する数値計算法の多くは虚時間空間で定式化され、その計算対象は温度グリーン関数と呼ばれる非物理的対象である。その中から、実験と比較可能な物理量を取り出すためには、数値的な解析接続が必要である。数値解析接続は悪条件の問題であり、その解決のため多くの試みがなされたが、未だ完全な方法は存在しない。近年、グリーン関数がNevanlinna関数と呼ばれる正則関数であることに着目した手法が提案された。しかしながら、その適用範囲はフェルミオン系に限られていた。本年度は、これら数値解析接続法に関する近年の発展に触発され、主として以下の2つの提案を行った。
    (1)Nevanlinna法のボゾン系への拡張
    (2)Nevanlinna法を実現するオープンソースライブラリの開発
    (1)に関して、双曲線関数を用いることで、ボゾン系に双対な補助フェルミオン系を導入し、Nevanlinna法のボゾン系への拡張を達成した。本成果をまとめた論文はJournal of the Physical Society of Japan誌で出版された。
    (2)に関して、Nevanlinna法の手続きは、多倍長精度演算や自動微分、非線形数値最適化などを必要とし、その実装は容易でない。従って、Julia言語で記述された高品質なオープンソースライブラリを作製し、広く公開した。本成果については、すでに研究が完成しており、論文として投稿中である。

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