Updated on 2021/12/22

写真a

 
TAKEMORI Nayuta
 
Organization
Research Institute for Interdisciplinary Science Special-Appointment Assistant Professor
Position
Special-Appointment Assistant Professor
External link

Research Interests

  • 物性理論

Research Areas

  • Natural Science / Magnetism, superconductivity and strongly correlated systems

Research History

  • Okayama University   Research Institute for Interdisciplinary Science(RIIS)   Specially Appointed Assistant Professor

    2016

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  • RIKEN   Center for Emergent Matter Science (CEMS)   Special Postdoctoral Researcher (SPDR)

    2016 - 2017

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  • Tokyo Institute of Technology   PhD student

    2013 - 2016

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Professional Memberships

Committee Memberships

  • 日本物理学会   領域8運営委員  

    2019.10 - 2020.9   

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    Committee type：Academic society

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Papers

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MISC

  • Physical properties of weak-coupling quasiperiodic superconductors Reviewed

    Nayuta Takemori, Ryotaro Arita, Shiro Sakai

    Physical Review B   102 ( 11 )   2020.9

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    Publisher：American Physical Society (APS)  

    We numerically study the physical properties of quasiperiodic superconductors
    with the aim of understanding superconductivity in quasicrystals. Considering
    the attractive Hubbard model on the Penrose tiling as a simple theoretical
    model, we calculate various basic superconducting properties and find
    deviations from the universal values of the Bardeen-Cooper-Schrieffer theory.
    In particular, we find that the jump of the specific heat at the
    superconducting transition is about 10-20% smaller than that universal value,
    in consistency with the experimental results obtained for the superconducting
    Al-Mg-Zn quasicrystalline alloy. Furthermore, we calculate current-voltage
    characteristics and find that the current gradually increases with the voltage
    on the Penrose tiling in contrast to a rapid increase in the periodic system.
    These distinctions originate from the nontrivial Cooper pairing characteristic
    to the quasiperiodic system.

    DOI： 10.1103/physrevb.102.115108

    arXiv

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    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.102.115108/fulltext

  • Hubbard model on the honeycomb lattice: From static and dynamical mean-field theories to lattice quantum Monte Carlo simulations Reviewed

    Marcin Raczkowski, Robert Peters, Thị Thu Phùng, Nayuta Takemori, Fakher F. Assaad, Andreas Honecker, Javad Vahedi

    Physical Review B   101 ( 12 )   2020.3

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    Publisher：American Physical Society (APS)  

    We study the one-band Hubbard model on the honeycomb lattice using a
    combination of quantum Monte Carlo (QMC) simulations and static as well as
    dynamical mean-field theory (DMFT). This model is known to show a quantum phase
    transition between a Dirac semi-metal and the antiferromagnetic insulator. The
    aim of this article is to provide a detailed comparison between these
    approaches by computing static properties, notably ground-state energy,
    single-particle gap, double occupancy, and staggered magnetization, as well as
    dynamical quantities such as the single-particle spectral function. At the
    static mean-field level local moments cannot be generated without breaking the
    SU(2) spin symmetry. The DMFT approximation accounts for temporal fluctuations,
    thus captures both the evolution of the double occupancy and the resulting
    local moment formation in the paramagnetic phase. As a consequence, the DMFT
    approximation is found to be very accurate in the Dirac semi-metallic phase
    where local moment formation is present and the spin correlation length small.
    However, in the vicinity of the fermion quantum critical point the spin
    correlation length diverges and the spontaneous SU(2) symmetry breaking leads
    to low-lying Goldstone modes in the magnetically ordered phase. The impact of
    these spin fluctuations on the single-particle spectral function --
    \textit{waterfall} features and narrow spin-polaron bands -- is only visible in
    the lattice QMC approach.

    DOI： 10.1103/physrevb.101.125103

    arXiv

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    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.101.125103/fulltext

  • Novel Fe-based superconductor LaFe2As2 in comparison with traditional pnictides

    I. I. Mazin, Makoto Shimizu, Nayuta Takemori, Harald O. Jeschke

    2019.5

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    Publishing type：Internal/External technical report, pre-print, etc.  

    The recently discovered Fe-based superconductor (FeBS) LaFe2As2 seems to
    break away from an established pattern that doping FeBS beyond 0.2e/Fe destroys
    superconductivity. LaFe2As2 has an apparent doping of 0.5e, yet superconducts
    at 12.1 K. Its Fermi surface bears no visual resemblance with the canonical
    FeBS Fermiology. It also exhibits two phases, none magnetic and only one
    superconducting. We show that the difference between them has nonetheless
    magnetic origin, the one featuring disordered moments, and the other locally
    nonmagnetic. We find that La there assumes an unusual valence of +2.6 to +2.7,
    so that the effective doping is reduced to 0.30-0.35e. A closer look reveals
    the same key elements: hole Fermi surfaces near Gamma-Z and electron ones near
    the X-P lines, with the corresponding peak in susceptibility, and a strong
    tendency to stripe magnetism. The physics of LaFe2As2 is thus more similar to
    the FeBS paradigm than hitherto appreciated.

    DOI： 10.1103/PhysRevLett.123.267001

    arXiv

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  • CdI<sub>2</sub>型構造を持つ遷移金属酸化物NaAO2(A=Co,Cr,Fe)における熱電特性の温度依存性:LDA+DMFT法による解析

    竹森那由多, 酒井志朗, 有田亮太郎, 有田亮太郎

    日本物理学会講演概要集(CD-ROM)   74 ( 2 )   2019

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  • CdI<sub>2</sub>型構造を持つ遷移金属酸化物NaAO<sub>2</sub>(A=Co,Cr,Fe)における熱電特性の理論解析

    竹森那由多, 酒井志朗, 有田亮太郎, 有田亮太郎

    日本物理学会講演概要集(CD-ROM)   74 ( 1 )   2019

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  • Two-dome superconductivity in FeS induced by a Lifshitz transition

    Makoto Shimizu, Nayuta Takemori, Daniel Guterding, Harald O. Jeschke

    Phys. Rev. Lett. 121, 137001 (2018)   2018.6

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    Publishing type：Internal/External technical report, pre-print, etc.  

    Among iron chalcogenide superconductors, FeS can be viewed as a simple,
    highly compressed relative of FeSe without nematic phase and with weaker
    electronic correlations. Under pressure, however, the superconductivity of
    stoichiometric FeS disappears and reappears, forming two domes. We perform
    electronic structure and spin fluctuation theory calculations for tetragonal
    FeS in order to analyze the nature of the superconducting order parameter. In
    the random phase approximation we find a gap function with d-wave symmetry at
    ambient pressure, in agreement with several reports of a nodal superconducting
    order parameter in FeS. Our calculations show that, as a function of pressure,
    the superconducting pairing strength decreases until a Lifshitz transition
    takes place at 4.6 GPa. As a hole pocket with a large density of states appears
    at the Lifshitz transition, the gap symmetry is altered to sign-changing
    s-wave. At the same time the pairing strength is severely enhanced and
    increases up to a new maximum at 5.5 GPa. Therefore, our calculations naturally
    explain the occurrence of two superconducting domes in FeS.

    DOI： 10.1103/PhysRevLett.121.137001

    arXiv

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  • Intersite electron correlations on inhomogeneous lattices: a real-space dual fermion approach

    Nayuta Takemori, Akihisa Koga, Hartmut Hafermann

    TMU INTERNATIONAL SYMPOSIUM ON NEW QUANTUM PHASES EMERGING FROM NOVEL CRYSTAL STRUCTURE   683   2018.1

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    Language：English   Publishing type：Internal/External technical report, pre-print, etc.   Publisher：IOP PUBLISHING LTD  

    We develop a real-space extension of the dual fermion approach. This method
    is formulated in terms of real-space Green's functions and local vertex
    functions, which enables us to discuss local and nonlocal correlations in
    inhomogeneous systems with an arbitrary geometric structure. We first
    demonstrate that the approach gives us reasonable results for a homogenous
    periodic system by taking into account onsite and nearest-neighbor intersite
    correlations. Moreover, we study the half-filled Hubbard model on the
    quasiperiodic Penrose lattice and clarify the role of intersite correlations
    for the Mott transition. The intersite correlations lead to a rich structure in
    local observables which is inherited from the quasiperiodic structure of the
    lattice.

    DOI： 10.1088/1742-6596/683/1/012040

    Web of Science

    arXiv

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  • 準結晶超伝導体を特徴づける実験観測量の理論計算

    竹森那由多, 酒井志朗, 有田亮太郎

    日本物理学会講演概要集(CD-ROM)   73 ( 2 )   2018

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  • ペンローズ格子上の超伝導の理論研究

    酒井志朗, 竹森那由多, 古賀昌久, 有田亮太郎

    日本物理学会講演概要集(CD-ROM)   72 ( 1 )   2017

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  • CdI<sub>2</sub>型構造を持つ遷移金属酸化物における熱電効果:LDA+DMFT法による解析

    竹森那由多, 酒井志朗, 有田亮太郎

    日本物理学会講演概要集(CD-ROM)   72 ( 1 )   2017

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  • LDA+DMFT法によるNa<sub>x</sub>CoO<sub>2</sub>の熱電係数の計算

    竹森那由多, 酒井志朗, 有田亮太郎

    日本物理学会講演概要集(CD-ROM)   71 ( 2 )   2016

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  • Theoretical investigations on correlation effects in quasi-periodic system

    50 ( 10 )   543 - 549,表紙   2015.10

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  • 8pPSA-16 Development of numerical method for quasi-periodic system

    Takemori Nayuta, Koga Akihisa

    Meeting abstracts of the Physical Society of Japan   69 ( 2 )   136 - 136   2014.8

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    Language：Japanese   Publisher：The Physical Society of Japan (JPS)  

    CiNii Article

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  • 8aBK-11 Analysis of an extended periodic Anderson model in quasiperiodic system

    Takemura Shinichi, Takemori Nayuta, Koga Akihisa

    Meeting abstracts of the Physical Society of Japan   69 ( 2 )   356 - 356   2014.8

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    Language：Japanese   Publisher：The Physical Society of Japan (JPS)  

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  • 28aPS-35 Analysis of Periodic Anderson Model in quasiperiodic system

    Takemura Shinichi, Takemori Nayuta, Koga Akihisa

    Meeting abstracts of the Physical Society of Japan   69 ( 1 )   601 - 601   2014.3

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    Language：Japanese   Publisher：The Physical Society of Japan (JPS)  

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  • 30aCJ-5 Mott transition in quasiperiodic system

    Takemori Nayuta, Koga Akihisa

    Meeting abstracts of the Physical Society of Japan   69 ( 1 )   671 - 671   2014.3

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    Language：Japanese   Publisher：The Physical Society of Japan (JPS)  

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  • 28aCF-5 Stability of the superfluid state in three component Fermionic optical lattice system II

    Okanami Y., Takemori N., Koga A.

    Meeting abstracts of the Physical Society of Japan   69 ( 1 )   187 - 187   2014.3

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    Language：Japanese   Publisher：The Physical Society of Japan (JPS)  

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  • Stability of the superfluid state in three component Fermionic optical lattice system

    Okanami Y., Takemori N., Koga A.

    Meeting abstracts of the Physical Society of Japan   68 ( 2 )   130 - 130   2013.8

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    Language：Japanese   Publisher：The Physical Society of Japan (JPS)  

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  • Local electronic correlation in two dimensional Penrose lattice

    Takemori Nayuta, Koga Akihisa

    Meeting abstracts of the Physical Society of Japan   68 ( 2 )   714 - 714   2013.8

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    Language：Japanese   Publisher：The Physical Society of Japan (JPS)  

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  • 29aEP-3 Local electronic correlation in two dimensional Penrose lattice

    Takemori Nayuta, Koga Akihisa

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   890 - 890   2013.3

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    Language：Japanese   Publisher：The Physical Society of Japan (JPS)  

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  • 21aAL-9 Stability of the supersolid state in fermionic mass imbalanced optical lattice system

    Takemori Nayuta, Koga Akihisa

    Meeting abstracts of the Physical Society of Japan   67 ( 2 )   178 - 178   2012.8

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    Language：Japanese   Publisher：The Physical Society of Japan (JPS)  

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  • 24pAD-1 Fermionic mixtures with mass imbalance in optical lattices

    Takemori Nayuta, Koga Akihisa

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   186 - 186   2012.3

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    Language：Japanese   Publisher：The Physical Society of Japan (JPS)  

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  • Low-Temperature Properties of the Fermionic Mixtures with Mass Imbalance in Optical Lattice Reviewed

    Nayuta Takemori, Akihisa Koga

    J. Phys. Soc. Jpn.   81 ( 6 )   063002 - 063002   2012

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    Language：English  

    We study the attractive Hubbard model with mass imbalance to clarify the low-temperature properties of fermionic mixtures in an optical lattice. By combining dynamical mean-field theory with continuous-time quantum Monte Carlo simulation, we discuss the competition between the superfluid and density wave states at half filling. By calculating the energy and order parameter for each state, we clarify that the coexisting (supersolid) state, where the density wave and superfluid states are degenerate, is realized in the system. We then determine the phase diagram at finite temperatures. © 2012 The Physical Society of Japan.

    DOI： 10.1143/JPSJ.81.063002

    Scopus

    arXiv

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Presentations

  • Theoretical investigation on Superconducting Hypermaterials Invited

    Nayuta Takemori

    The 1st Meeting of the International Research Network  2021.10.5 

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    Event date： 2021.10.3 - 2021.10.7

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

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  • 超伝導ハイパーマテリアルの理論的研究 Invited

    竹森 那由多

    ISSP WOMEN'S WEEK 2021  2021.8.4 

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    Event date： 2021.8.3 - 2021.8.5

    Presentation type：Oral presentation (invited, special)  

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  • Development of Band Structure Calculation for Quasicrystals: Implementation of Eigenvalue Problem

    竹森那由多, 山本昭二

    新学術領域ハイパーマテリアル 第 6 回領域(Web)会議  2021.7.13 

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    Event date： 2021.7.13 - 2021.7.15

    Presentation type：Oral presentation (general)  

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  • Quasiperiodic superconductors Invited

    2021.6.7 

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    Event date： 2021.6.7 - 2021.6.8

    Presentation type：Oral presentation (invited, special)  

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  • 超伝導ハイパーマテリアルにおける相関効果 Invited

    日本物理学会 第76回年次大会（2021年）  2021.3.15 

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    Event date： 2021.3.12 - 2021.3.15

    Presentation type：Oral presentation (invited, special)  

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  • Physical properties of weak-coupling quasiperiodic superconductors Invited International conference

    Nayuta Takemori

    Interdisciplinary Symposium for Quasicrystals and Strongly Correlated Electron Systems  2019.6.24 

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    Event date： 2019.6.23 - 2019.6.27

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

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  • Physical properties of weak-coupling quasiperiodic superconductors Invited

    2020.9.24 

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    Presentation type：Oral presentation (invited, special)  

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  • Towards Understanding of the Superconductivity in Quasicrystals: Superconductivity in Quasiperiodic System Invited International conference

    Nayuta Takemori

    Aperiodic2018  2018.7.9 

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

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  • Local and short-range electron correlation effects on the Penrose lattice Invited International conference

    Nayuta Takemori

    2016.9 

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

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  • 準周期系における強相関効果の理論 Invited

    Nayuta Takemori

    2016.3 

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

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Works

  • ハイパーマテリアル塗り絵（ペンローズタイル）

    竹森那由多

    2020.9.7

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    Work type：Artistic work  

    File： nurie_penrose.pdf

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  • ハイパーマテリアル図形パズル

    竹森那由多

    2020.5.2

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    Work type：Artistic work  

    File： seitakakukeiB.pdf

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  • ハイパーマテリアル塗り絵（ロゴ）

    竹森那由多

    2020.5.2

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    Work type：Artistic work  

    File： nurie.pdf

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  • ハイパーマテリアル広報用Facebookページの作成

    竹森那由多

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Awards

  • Young Scientist Award of the Physical Society of Japan (Division 6)

    2021.10   The Physical Society of Japan  

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  • 第1回 蔡安邦賞

    2021.3   第25回準結晶研究会 (第2回ハイパーマテリアル若手研究会)  

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  • Young Investigator Award for Outstanding Presentation

    2018.7   Aperiodic2018  

    Nayuta Takemori

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  • Seiichi Tejima Doctoral Dissertation Award

    2017.2   Tokyo Institute of Technology   Strong electron correlation effects in a quasiperiodic lattice

    Nayuta Takemori

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Research Projects

  • Hypermaterials informatics and the search for hidden orders

    Grant number：19H05820  2019.06 - 2024.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    吉田 亮, 岡本 ゆかり, 上田 那由多, 野澤 和生

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    Grant amount：\89700000 （ Direct expense: \69000000 、 Indirect expense：\20700000 ）

    初年度は基礎データの収集と共同研究体制の構築、機械学習等の基盤技術の整備を重点的に推進した。当該年度の達成事項は、以下の通りである。
    (1) Materials Project 等の従来の結晶系データベースに加え、領域内の準結晶関連のデータセットを抽出・整理した。また、過去に出版された論文中のグラフから準結晶や近似結晶を含む多様な化合物の電気的特性の実験データを取得した。さらに、結晶構造データベースの3万種類の安定化合物について、配位構造や角度などの大規模局所構造データを取得した。
    (2) オープンソースプラットフォームXenonPyに機能拡張を施し、化学組成から準結晶らしさ（準結晶・近似結晶・通常の結晶）を判断する機械学習の予測モデルを構築した。既存物質に対する予測性能を検証したところ、任意の組成に対する準結晶・近似結晶・結晶のクラスを約90%の精度で分類できることが明らかになった。同モデルを用いて3-4元系金属化合物の全組成に対して仮想スクリーニングを実施し、準結晶の候補組成を抽出した。さらに、バンドギャップや磁性等を予測する機械学習モデルを構築し、有望な候補組成の絞り込みを行った。
    (3) 準周期タイリング上での超伝導状態を調査し、その比熱の跳び がBCS理論での値よりも15％小さくなり、Al-Mg-Zn準結晶での実験値と良い一致を示すことを明らかにした。この成果については現在国際学術誌に投稿し、査読中である。
    (4) Bi, PbがAg-In-Yb準結晶５回表面に形成する吸着構造を第一原理計算により調べた。走査型電子顕微鏡（STM）実験によりBiはPbと異なる吸着過程を示すことが示唆されていたが、これがSTMでは観測されない吸着層の影響によるものであることを見いだした。Au-Al-Tb近似結晶表面について、A01班と共同研究を開始するにあたり、予備的な計算を行った。

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  • Hypermaterials: Inovation of materials science in hyper space

    Grant number：19H05817  2019.06 - 2024.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    田村 隆治, 上田 那由多, 木村 薫, 高倉 洋礼, 出口 和彦, 吉田 亮, 高際 良樹

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    Grant amount：\218530000 （ Direct expense: \168100000 、 Indirect expense：\50430000 ）

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  • Theoretical study of superconductivity in strongly correlated quasicrystals

    2016.10 - 2019.03

    JSPS  Grant-in-Aid for Research Activity start-up 

    Nayuta Takemori

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    Authorship：Principal investigator  Grant type：Competitive

    Grant amount：\143

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  • Functional properties of strongly correlated quasicrystals

    2016.04 - 2017.06

    RIKEN  Special Postdoctoral Researcher 

    Nayuta Takemori

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    Authorship：Principal investigator  Grant type：Competitive

    Grant amount：\200

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  • Theoretical investigation of emergent quantum criticality in quasiperiodic system

    2015.04 - 2016.03

    JSPS  Grant-in-Aid for JSPS Fellows 

    Nayuta Takemori

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    Authorship：Principal investigator  Grant type：Competitive

    Grant amount：\170

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Social Activities

  • ISSP WOMEN’S WEEK 2021 パネルディスカッション:

    Role(s)：Panelist

    東京大学物性研究所  ISSP WOMEN’S WEEK 2021  2021.8.3 - 2021.8.5

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    Type：Lecture

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