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2014 Fiscal Year Annual Research Report

ナノ構造形成・新機能発現における電子論ダイナミクス

Planned Research

Project AreaMaterials Design through Computics: Complex Correlation and Non-equilibrium Dynamics
Project/Area Number 22104005
Research InstitutionThe University of Tokyo

Principal Investigator

押山 淳  東京大学, 工学(系)研究科(研究院), 教授 (80143361)

Co-Investigator(Kenkyū-buntansha) 宮崎 剛  独立行政法人物質・材料研究機構, 理論計算科学ユニット, グループリーダー (50354147)
土田 英二  独立行政法人産業技術総合研究所, ナノシステム研究部門, 主任研究員 (50357521)
尾崎 泰助  東京大学, 物性研究所, 教授 (70356723)
Project Period (FY) 2010-04-01 – 2015-03-31
Keywords密度汎関数理論 / カー・パリネロ分子動力学法 / 密度行列 / 実空間手法 / ナノ構造 / 新材料 / 電子状態 / 原子構造
Outline of Annual Research Achievements

本研究では、量子論の第一原理に基づく実空間アプローチを計算手法の軸とし、ナノスケール構造体での複合相関と非平衡ダイナミクスの解明、および新たな電子機能を有するナノ構造体の提唱を行うことを目的としている。計算手法の側面での26年度の成果は以下のとおりである。① 京コンピュータ上で高速化を行ってきたRSDFTコードへの、GP-GPUを活用したハイブリッド相関交換エネルギー汎関数の実装を行い、GP-GPUを使わない場合に比べ、1000原子規模計算で6倍の高速化を達成した。②実空間Car-Parrinello分子動力学法(RS-CPMD)コードの開発を行い、京コンピュータ上1000原子規模計算で1タイムステップ2~3秒のCPMD計算を実行可能とした。③ 密度行列の最適化に基づくオーダーN手法であるCONQUESTコードの京コンピュータ上でのチューニングにより、1,000,000原子第一原理計算が可能となった。またオーダーNのBorn-Oppenheimer分子動力学法計算コードが実装された。④ 多機能オーダーN法コードであるOpenMXにおいて、ターゲットシステムを高効率並列計算する際の、空間分割の新たな手法を開発した。以上の手法開発成果を活用し、① グラフェン多重層での層間の捩れが電子状態に劇的変化―フェルミ速度の劇的な減少と電子局在-を引き起こすこと、② エピタキシャル成長で自己組織的に出現するナノファセットの成因解明とそこでの強磁性および反強秩序の出現予測、③ZrB2上でのシリセンの出現とそこでのディラック電子の出現、④Si/Geへテロ接合における固有のナノ構造生成の起因とそこでの電子状態解明、⑤二層シリセンの新たな構造の発見とバルクSiと同程度の半導体ギャップを有することの解明、などの物質科学分野での成果が得られた。

Research Progress Status

26年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

26年度が最終年度であるため、記入しない。

  • Research Products

    (25 results)

All 2015 2014 Other

All Journal Article (20 results) (of which Peer Reviewed: 20 results,  Acknowledgement Compliant: 20 results) Presentation (4 results) (of which Invited: 4 results) Remarks (1 results)

  • [Journal Article] Large-Scale Real-Space Density-Functional Calculations: Moire-Induced Electron Localization in Graphene2015

    • Author(s)
      A. Oshiyama, J.-I. Iwata, K. Uchida and Y. Matsushita
    • Journal Title

      J. Appl. Phys.

      Volume: 117 Pages: 112811

    • DOI

      10.1063/1.4913837

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Energetics, Electron States, and Magnetization in Nearly Zigzag-Edged Graphene Nano-Ribbons2015

    • Author(s)
      S. Suda and A. Oshiyama
    • Journal Title

      J. Phys. Soc. Jpn

      Volume: 84 Pages: 024704

    • DOI

      10.7566/JPSJ.84.024704

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Optimized multi-site local orbitals in the large-scale DFT program CONQUEST2015

    • Author(s)
      A. Nakata, D. R. Bowler and T. Miyazaki
    • Journal Title

      Phys. Chem. Chem. Phys., published online

      Volume: - Pages: -

    • DOI

      10.1039/C5CP00934K

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Fragment Model Study of Molecular Multi-Orbital System X[Pd(dmit)2]22015

    • Author(s)
      H. Seo, T. Tsumuraya, M. Tsuchiizu, T. Miyazaki, R. Kato
    • Journal Title

      J. Phys. Soc. Jpn

      Volume: 84 Pages: 044716

    • DOI

      10.7566/JPSJ.84.044716

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Stabilization of ab initio molecular dynamics simulations at large time steps2015

    • Author(s)
      Eiji Tsuchida
    • Journal Title

      JPS Conference Proceedings

      Volume: 5 Pages: 011019

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Surface energy of Si(110)- and 3C-SiC(111)-terminated surfaces2014

    • Author(s)
      E. K. K. Abavare, I.-I. Iwata, A. Yaya and A. Oshiyama,
    • Journal Title

      Phys. Status Solidi B

      Volume: 251 Pages: 1408-1415

    • DOI

      10.1002/pssb.201350335

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Electron Confinement due to Stacking Control of Atomic Layers in SiC Polytypes: Role of Floaing States and Spontaneous Polarization2014

    • Author(s)
      Y.-i. Matsushita S. Furuya, and A. Oshiyama
    • Journal Title

      J. Phys. Soc. Jpn.

      Volume: 83 Pages: 094713

    • DOI

      10.7566/JPSJ.83.094713

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Atomic corrugation and electron localization due to Moire patterns in twisted bilayer graphenes2014

    • Author(s)
      K. Uchida, S. Furuya, J.-I. Iwata and A. Oshiyama
    • Journal Title

      Phys. Rev. B

      Volume: 90 Pages: 155451

    • DOI

      10.1103/PhysRevB.90.155451

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Avoiding critical-point phonon instabilities in two-dimensional materials: The origin of the stripe formation in epitaxial silicene2014

    • Author(s)
      C.-C. Lee, A. Fleurence, R. Friedlein, Y. Yamada-Takamura, and T. Ozaki
    • Journal Title

      Phys. Rev. B

      Volume: 90 Pages: 241402

    • DOI

      10.1103/PhysRevB.90.241402

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Diverse forms of bonding in two-dimensional Si allotropes: Nematic orbitals in the MoS2 structure2014

    • Author(s)
      F. Gimbert, C.-C. Lee, R. Friedlein, A. Fleurence, Y. Yamada-Takamura, and T. Ozaki
    • Journal Title

      Phys. Rev. B

      Volume: 90 Pages: 165423

    • DOI

      10.1103/PhysRevB.90.165423

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Band structure of silicene on zirconium diboride (0001) thin-film surface: Convergence of experiment and calculations in the one-Si-atom Brillouin zone2014

    • Author(s)
      C.-C. Lee, A. Fleurence, Y. Yamada-Takamura, T. Ozaki, and R. Friedlein
    • Journal Title

      Phys. Rev. B

      Volume: 90 Pages: 075422

    • DOI

      10.1103/PhysRevB.90.075422

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Competing magnetism in π-electrons in graphene with a single carbon vacancy2014

    • Author(s)
      C.-C. Lee, Y. Yamada-Takamura, and T. Ozaki
    • Journal Title

      Phys. Rev. B

      Volume: 90 Pages: 014401

    • DOI

      10.1103/PhysRevB.90.014401

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] A method of orbital analysis for large-scale first-principles simulations2014

    • Author(s)
      T. Ohwaki, M. Otani, and T. Ozaki
    • Journal Title

      J. Chem. Phys

      Volume: 140 Pages: 244105

    • DOI

      10.1063/1.4884119

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Strain effects on the magnetic anisotropy of Y2Fe14B examined by first-principles calculations2014

    • Author(s)
      Z. Torbatian, T. Ozaki, S. Tsuneyuki, and Y. Gohda
    • Journal Title

      Appl. Phys. Lett.

      Volume: 104 Pages: 242403

    • DOI

      10.1063/1.4883840

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Systematic study of electronic and magnetic properties for Cu12-xTMxSb4S13 (TM= Mn, Fe, Co, Ni, and Zn) tetrahedrite2014

    • Author(s)
      K. Suekuni, Y. Tomizawa, T. Ozaki, and M. Koyano
    • Journal Title

      J. Appl. Phys

      Volume: 115 Pages: 143702

    • DOI

      10.1063/1.4871265

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Efficient Calculations with Multisite Local Orbitals in a Large-Scale DFT Code CONQUEST2014

    • Author(s)
      A. Nakata, D. R. Bowler and T. Miyazaki
    • Journal Title

      J. Chem. Theory Comput.

      Volume: 10 Pages: 4813-4822

    • DOI

      10.1021/ct5004934

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Stable and Efficient Linear Scaling First-Principles Molecular Dynamics for 10000+ Atoms2014

    • Author(s)
      M. Arita, D. R. Bowler and T. Miyazaki
    • Journal Title

      J. Chem. Theory Comput

      Volume: 10 Pages: 5419-5425

    • DOI

      10.1021/ct500847y

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Large-scale DFT simulations with a linear-scaling DFT code Conquest on K computer2014

    • Author(s)
      M. Arita, S. Arapan, D. R. Bowler and T. Miyazaki
    • Journal Title

      Journal of Advanced Simulation in Science and Engineering

      Volume: 1 Pages: 87-97

    • DOI

      10.15748/jasse.1.87

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Pressure-Induced Metallic Conductivity in the Single-Component Molecular Crystal [Ni(dmit)2]2014

    • Author(s)
      H-B Cui, T. Tsumuraya, T. Miyazaki, Y. Okano, R. Kato
    • Journal Title

      Eur. J. Inorg. Chem. 2014

      Volume: 2014 Pages: 3837-3840

    • DOI

      10.1002/ejic.201400130

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Time-dependent Born charges of lithium borate melts by ab initiomolecular dynamics2014

    • Author(s)
      Takahiro Ohkubo, Eiji Tsuchida, and Yasuhiko Iwadate
    • Journal Title

      CHEMICAL PHYSICS LETTERS

      Volume: 614 Pages: 68-72

    • DOI

      10.1016/j.cplett.2014.08.008

    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] Static and Dynamical Density-Functional Calculations for Nano-Materials: Moiré-Induced Electron Localization in Graphene and Laser-Triggered Crystallization in SiO22015

    • Author(s)
      A. Oshiyama
    • Organizer
      MANA International Symposium 2015
    • Place of Presentation
      Tsukuba(Tukuba,Ibaraki,Japan)
    • Year and Date
      2015-03-11 – 2015-03-13
    • Invited
  • [Presentation] Development and applications of a linear-scaling DFT code CONQUEST2014

    • Author(s)
      Tsuyoshi Miyazaki
    • Organizer
      4th Int. Workshop on Massively Parallel Programming Now in Quantum Chemistry
    • Place of Presentation
      University of Tokyo (Bunkyo-ku, Tokyo, Japan)
    • Year and Date
      2014-11-23 – 2014-11-24
    • Invited
  • [Presentation] Theoretical and experimental exploration of two-dimensional Si structures2014

    • Author(s)
      T. Ozaki
    • Organizer
      The 17th Asian Workshop on First-Principles Electronic Structure Calculations
    • Place of Presentation
      Yonsei University, Seoul, Korea
    • Year and Date
      2014-11-02 – 2014-11-05
    • Invited
  • [Presentation] Large-scale DFT simulations on nano structured materials using a linear-scaling technique2014

    • Author(s)
      Tsuyoshi Miyazaki
    • Organizer
      Collaborative Conference on 3D Research (CC3DMR) 2014
    • Place of Presentation
      Songdo Convensia (Incheon, South Korea)
    • Year and Date
      2014-06-23 – 2014-06-27
    • Invited
  • [Remarks] コンピューティクスによる物質デザイン:複合相関と非平衡ダイナミクス

    • URL

      http://computics-material.jp/

URL: 

Published: 2016-06-01  

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