Updated on 2025/11/11

写真a

 
GOHDA Yoshihiro
 
Organization
School of Materials and Chemical Technology Professor
Title
Professor
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News & Topics

Degree

  • 博士(工学) ( 東京大学 )

Research Interests

  • 物性物理、磁性材料、ナノ構造

  • 表面・界面物性

  • 耐熱金属材料

  • マテリアルズインフォマティクス

  • 磁性材料

  • 相平衡

  • 電子状態理論

  • 磁性

Research Areas

  • Nanotechnology/Materials / Metallic material properties

  • Nanotechnology/Materials / Structural materials and functional materials

  • Natural Science / Magnetism, superconductivity and strongly correlated systems

  • Nanotechnology/Materials / Nanostructural physics

Education

  • The University of Tokyo   The Graduate School of Engineering

    - 2003.3

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  • The University of Tokyo   The Faculty of Engineering

    - 1997.3

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Research History

  • Institute of Science Tokyo   Department of Materials Science and Engineering   Professor

    2025.11

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    Country:Japan

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  • Institute of Science Tokyo / Tokyo Institute of Technology   Department of Materials Science and Engineering   Associate Professor

    2016.4 - 2025.10

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  • Tokyo Institute of Technology   Interdisciplinary Graduate School of Science and Engineering, Department of Materials Science and Engineering   Associate Professor

    2014.4 - 2016.3

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  • The University of Tokyo   Graduate School of Science, Department of Physics   Assistant Professor

    2008.7 - 2014.3

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  • The University of Tokyo   The Graduate School of Engineering, Department of Applied Physics

    2007.11 - 2008.6

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  • TU München / Uni Ulm (Germany)   Postdoc

    2004.4 - 2007.10

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  • The University of Tokyo   Department of Materials Engineering   PD of JSPS

    2003.4 - 2004.3

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Professional Memberships

Papers

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MISC

  • Magnetism without Magnetic Elements? : Theoretical Prediction of Roles Played by Interfaces and Defects Reviewed

    GOHDA Yoshihiro, OSHIYAMA Atsushi, TSUNEYUKI Shinji

    Butsuri   66 ( 11 )   836 - 840   2011.11

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    This article reviews recent progresses in first-principles theory for magnetism including so-called d^0 magnetism. Similarities and differences in spin properties of interface structures and point defects are discussed.

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  • First-principles determination of intergranular atomic arrangements and magnetic properties in rare-earth permanent magnets Reviewed

    Yoshihiro Gohda

    Science and Technology of Advanced Materials   22 ( 1 )   113 - 123   2021

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    Authorship:Lead author, Corresponding author  

    DOI: 10.1080/14686996.2021.1877092

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  • Nd-Fe-B焼結磁石の二粒子粒界相に関する第一原理計算

    相内優太, 立津慶幸, 合田義弘

    日本金属学会講演概要(CD-ROM)   162nd   2018

  • Nd-Fe-B焼結磁石の二粒子粒界相に関する第一原理計算

    相内優太, 立津慶幸, 合田義弘

    応用物理学会春季学術講演会講演予稿集(CD-ROM)   65th   2018

  • Ga添加型Nd-Fe-B磁石の第一原理計算を用いた磁気特性解析

    立津慶幸, 常行真司, 常行真司, 合田義弘

    日本金属学会講演概要(CD-ROM)   161st   2017

  • 第一原理計算からみたNd-Fe-B磁石界面近傍のCuの役割

    立津慶幸, 常行真司, 常行真司, 合田義弘, 合田義弘

    日本金属学会講演概要(CD-ROM)   158th   2016

  • 10aAQ-7 Construction and applications of a first-principles anharmonic lattice model considering long-range Coulomb interaction

    Nishimoto T., Tadano T., Gohda Y., Tsuneyuki S.

    Meeting abstracts of the Physical Society of Japan   69 ( 2 )   178 - 178   2014.8

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  • 9aAK-6 Electronic structure calculation of fct-Fe/Cu(001)

    Tatetsu Yasutomi, Tsuneyuki Shinji, Gohda Yoshihiro

    Meeting abstracts of the Physical Society of Japan   69 ( 2 )   652 - 652   2014.8

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  • 8aAE-4 Theoretical consideration about the valence of hydrogen in an insulator

    Yoshizawa Kanako, Iwazaki Yoshiki, Gohda Yoshihiro, Tsuneyuki Shinji

    Meeting abstracts of the Physical Society of Japan   69 ( 2 )   689 - 689   2014.8

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  • 7pBC-7 Development of a fisrt-principles method to calculate the single-ion magnetic anistropy and its applications to strain effects for Y_2Fe_<11>B

    Gohda Y., Torbatian Z., Ozaki T., Tsuneyuki S.

    Meeting abstracts of the Physical Society of Japan   69 ( 2 )   268 - 268   2014.8

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  • 7pBC-6 First-principles analyses of structures and magnetic anisotropy energy of interfaces between Nd_2Fe_<14>B main phases and Nd oxides

    Misawa H., Gohda Y., Tsuchiura H., Tsuneyuki S.

    Meeting abstracts of the Physical Society of Japan   69 ( 2 )   268 - 268   2014.8

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  • 10aAQ-3 Method for Calculating the One-Electron Spectrum of Large Systems based on Divide-and-Conquer Method

    Yamada Shunsuke, Gohda Yoshihiro, Tsuneyuki Shinji

    Meeting abstracts of the Physical Society of Japan   69 ( 2 )   177 - 177   2014.8

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  • 9aBC-9 First-Principles Analysis of Magnetic Properties of ε-Fe_2O_3

    Hirai D., Tsuneyuki S., Gohda Y.

    Meeting abstracts of the Physical Society of Japan   69 ( 2 )   301 - 301   2014.8

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  • 9aAK-6 Electronic structure calculation of fct-Fe/Cu(001)

    Tatetsu Yasutomi, Tsuneyuki Shinji, Gohda Yoshihiro

    Meeting abstracts of the Physical Society of Japan   69 ( 2 )   296 - 296   2014.8

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  • 30aAL-6 Theoretical analysis of hydrogen in BaTiO_3 by first principles calculations of NMR chemical shifts

    Sato Nobuya, Gohda Yoshihiro, Tsuneyuki Shinji

    Meeting abstracts of the Physical Society of Japan   69 ( 1 )   945 - 945   2014.3

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  • 30aAY-9 First-principles studies of interfaces between Nd_2Fe_<14>B grains and grain boundaries in Nd-Fe-B sintered magnets

    Misawa H., Gohda Y., Tsuchiura H., Tsuneyuki S.

    Meeting abstracts of the Physical Society of Japan   69 ( 1 )   906 - 906   2014.3

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  • Structural exploration utilizing modified potential energy surfaces

    Endo T., Gohda Y., Tsuneyuki S.

    Meeting abstracts of the Physical Society of Japan   68 ( 2 )   255 - 255   2013.8

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  • First-principles studies of charge states and NMR chemical shifts for hydrogen impurities in oxides

    Sato Nobuya, Yoshizawa Kanako, Gohda Yoshihiro, Tsuneyuki Shinji

    Meeting abstracts of the Physical Society of Japan   68 ( 2 )   851 - 851   2013.8

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  • Theoretical studies on the effect of higher-order phonon-phonon scatterings in semiconductors

    Tadano Terumasa, Gohda Yoshihiro, Tsuneyuki Shinji

    Meeting abstracts of the Physical Society of Japan   68 ( 2 )   283 - 283   2013.8

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  • Electron states and the origin of impurity hydrogen in oxide semiconductors with the rutile structure

    Yoshizawa Kanako, lwazaki Yoshiki, Gohda Yoshihiro, Tsuneyuki Shinj

    Meeting abstracts of the Physical Society of Japan   68 ( 2 )   867 - 867   2013.8

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  • One-electron Spectrum Calculation based on Divide-and-Conquer method

    Yamada Shunsuke, Gohda Yoshihiro, Tsuneyuki Shinji

    Meeting abstracts of the Physical Society of Japan   68 ( 2 )   255 - 255   2013.8

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  • 26aXS-4 First-principles studies of phonon transport properties in type-I clathrate compounds

    Tadano Terumasa, Gohda Yoshihiro, Tsuneyuki Shinji

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   1011 - 1011   2013.3

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  • 27pPSA-17 Development of psuedopotentials based on hybrid-density functional theories and its applications

    Yamamoto Y., Gohda Y., Tsuneyuki S.

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   371 - 371   2013.3

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  • 27pPSA-20 Structural Exploration Method utilizing Anharmonicity of Potential Energy Surfaces

    Endo Tatsuya, Gohda Yoshihiro, Tsuneyuki Shinji

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   371 - 371   2013.3

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  • 26pPSA-40 First-principles studies of interfaces between Nd_2Fe_<14>B grains and grain boundaries in Nd_2Fe_<14>B sintered magnets

    Misawa H., Gohda Y., Tsuchiura H., Tsuneyuki S.

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   979 - 979   2013.3

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  • 26aXS-6 First-principles calculation of oxygen vacancy and impurity hydrogen in rutile TiO_2

    Yoshizawa Kanako, Iwazaki Yoshiki, Gohda Yoshihiro, Tsuneyuki Shinji

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   1011 - 1011   2013.3

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  • Development of an improved tetrahedron method for the Brillouin zone integration in linear response calculations

    Kawamura M, Gohda Y, Tsuneyuki S

    Meeting Abstracts of the Physical Society of Japan   68 ( 0 )   236 - 236   2013

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  • 18pAD-3 Ab initio calculation of light element superconductors based on density functional theory for superconductors

    Kawamura M., Gohda Y., Tsuneyuki S.

    Meeting abstracts of the Physical Society of Japan   67 ( 2 )   233 - 233   2012.8

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  • 19aEC-12 Structral phase transition of graphene accompanied by GaN growth

    Gohda Y., Tsuneyuki S.

    Meeting abstracts of the Physical Society of Japan   67 ( 2 )   770 - 770   2012.8

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  • 19aPSB-22 Structural Exploration by Scaled Hypersphere Search and Force Inversion

    Endo Tatsuya, Gohda Yoshihiro, Tsuneyuki Shinji

    Meeting abstracts of the Physical Society of Japan   67 ( 2 )   260 - 260   2012.8

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  • 19aAG-12 First-principles studies of phonon transport properties in the thermoelectric materials

    Tadano Terumasa, Gohda Yoshihiro, Tsuneyuki Shinji

    Meeting abstracts of the Physical Society of Japan   67 ( 2 )   857 - 857   2012.8

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  • 19aPSB-19 Development of psuedopotentials based on hybrid-density functional theories

    Yamamoto Y., Gohda Y., Tsuneyuki S.

    Meeting abstracts of the Physical Society of Japan   67 ( 2 )   259 - 259   2012.8

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  • 26pCJ-2 Optical conductivity of dilute nitride GaNP from first principles

    Gohda Y., Tsuneyuki S.

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   745 - 745   2012.3

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  • 27aBG-5 Contribution from anisotropic electron-phonon coupling in density functional calculations for superconductors

    Kawamura M., Gohda Y., Tsuneyuki S.

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   372 - 372   2012.3

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  • 20aFF-5 First-principles calculations for the electric double-layer capacitance on solid-liquid interfaces

    Ando Yasunobu, Gohda Yoshihiro, Tsuneyuki Shinji

    Meeting Abstracts of the Physical Society of Japan   67 ( 0 )   831 - 831   2012

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  • 21pGT-7 Ab initio prediction of superconducting transition temperature based on density functional theory for superconductors

    Kawamura M., Gohda Y., Tsuneyuki S.

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   209 - 209   2011.8

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  • 22aHA-11 First-principles study on the electric double layer capacitance at water-metal interfaces

    Ando Yasunobu, Gohda Yoshihiro, Tsuneyuki Shinji

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   909 - 909   2011.8

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  • 24pHA-11 Thermal conductivity calculations of nanowires with first principles anharmonic lattice model

    Tadano Terumasa, Gohda Yoshihiro, Tsuneyuki Shinji

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   961 - 961   2011.8

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  • 23pHA-8 Possibility of d^0 magnetism at interfaces

    Gohda Y., Tstuneyuki S.

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   933 - 933   2011.8

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  • 28pTG-1 First-principles study on the electronic double layer at solid-liquid interfaces

    Ando Yasunobu, Gohda Yoshihiro, Tsuneyuki Shinji

    Meeting abstracts of the Physical Society of Japan   66 ( 1 )   945 - 945   2011.3

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  • 28aPS-67 Development of first-principles anharmonic lattice model and its applications to thermal conductivity calculations

    Tadano Terumasa, Gohda Yoshihiro, Tsuneyuki Shinji

    Meeting abstracts of the Physical Society of Japan   66 ( 1 )   362 - 362   2011.3

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  • 28pTG-3 Ab initio calculations on spin properties of nitride-boride interfaces

    Gohda Y., Tsuneyuki S.

    Meeting abstracts of the Physical Society of Japan   66 ( 1 )   946 - 946   2011.3

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  • 26pWY-3 Lattice thermal-conductivity calculations with first-principles anharmonic lattice model

    Tadano Terumasa, Gohda Yoshihiro, Tsuneyuki Shinji

    Meeting abstracts of the Physical Society of Japan   65 ( 2 )   929 - 929   2010.8

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  • 22pHS-10 First-principles modeling of anharmonic lattice vibration in crystals

    Tadano Terumasa, Gohda Yoshihiro, Tsuneyuki Shinji

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   1000 - 1000   2010.3

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  • 21aGL-6 First-principles study on Schottky contact at Al/SiON/SiC(0001) Interfaces

    Ando Yasunobu, Gohda Yoshihiro, Tsuneyuki Shinji

    Meeting Abstracts of the Physical Society of Japan   65 ( 0 )   934 - 934   2010

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  • 25pRA-4 Ab initio calculations on nitride/boride interfaces

    Gohda Y., Tsuneyuki S.

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   333 - 333   2009.8

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  • 26aYG-3 Analysis of the electronic properties on Al atom-adsorbed SiON/SiC(0001) surface system

    Ando Yasunobu, Gohda Yoshihiro, Tsuneyuki Shinji

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   809 - 809   2009.8

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  • 30aVE-4 First-principles calculations for spin polarization and structure relaxation of multivacancies in GaN

    Gohda Y., Oshiyama A.

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   711 - 711   2009.3

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  • 21aYK-9 Magnetism due to cation vacancies in nitride semiconductors

    Gohda Y., Oshiyama A.

    Meeting abstracts of the Physical Society of Japan   63 ( 2 )   604 - 604   2008.8

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  • 21aPS-9 First-Principles Study on the Separation and Bias-Voltage Dependences of the Force between Jellium Electrodes

    Nakamura Y., Tanaka M., Furuya S., Gohda Y., Watanabe S.

    Meeting abstracts of the Physical Society of Japan   60 ( 2 )   756 - 756   2005.8

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  • Effects of atomic species of the tip on apparent barrier height

    Totsuka H., Gohda Y., Furuya S., Watanabe S.

    Meeting abstracts of the Physical Society of Japan   58 ( 2 )   770 - 770   2003.8

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  • Bias voltage dependence of tunneling barrier height on Al surface

    Totsuka H., Gohda Y., Furuya S., Watanabe S.

    Meeting abstracts of the Physical Society of Japan   58 ( 1 )   847 - 847   2003.3

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  • 28pPSB-10 First Principles Study of Forces Acting on Nanostructures in Electric Fields II

    Hu C. P., Gohda Y., Furuya S., Watanabe S.

    Meeting abstracts of the Physical Society of Japan   58 ( 1 )   847 - 847   2003.3

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  • Ab Initio Calculation of Capacitance of Nano Scale Structures

    Tanaka M., Gohda Y., Furuya S., Watanabe S.

    Meeting abstracts of the Physical Society of Japan   58 ( 1 )   848 - 848   2003.3

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  • Electric Properties of Al Atomic Chains under Finite Bias Voltages

    Furuya S., Gohda Y., Sasaki N., Watanabe S.

    Meeting abstracts of the Physical Society of Japan   58 ( 1 )   890 - 890   2003.3

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  • Ab initio calculations of field emission from Si(100) surfaces

    Gohda Y., Watanabe S.

    Meeting abstracts of the Physical Society of Japan   58 ( 1 )   890 - 890   2003.3

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  • Theoretical analysis of tunneling barrier height at defect sites on Al(100) surface.

    Totsuka H., Gohda Y., Furuya S., Watanabe S.

    Meeting abstracts of the Physical Society of Japan   57 ( 2 )   739 - 739   2002.8

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  • 9aSM-14 The effect of charging on the transport properties of single molecules

    Gohda Y., Watanabe S., Pantelides S.T.

    Meeting abstracts of the Physical Society of Japan   57 ( 2 )   781 - 781   2002.8

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  • Numerical simulation of field emission current considering space charge

    Sasaki N., Watanabe S., Gohda Y., Fujita H.

    Meeting abstracts of the Physical Society of Japan   57 ( 2 )   751 - 751   2002.8

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  • 25pPSB-2 The analysis of the local work function based on ab initio calculation.

    Totsuka H., Gohda Y., Furuya S., Watanabe S.

    Meeting abstracts of the Physical Society of Japan   57 ( 1 )   836 - 836   2002.3

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  • 25pPSB-3 Ab Initio Calculation of Electric Properties of AI Atomic Chains II : Effects of Junction Structure

    Furuya S., Gohda Y., Sasaki N., Watanabe S.

    Meeting abstracts of the Physical Society of Japan   57 ( 1 )   836 - 836   2002.3

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  • 25pPSB-4 First Principles Study of Forces Acting on Nanostructures in Electric Fields

    Hu C.P., Gohda Y., Furuya S., Watanabe S.

    Meeting abstracts of the Physical Society of Japan   57 ( 1 )   836 - 836   2002.3

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  • Ab Initio Calculation of Electric Properties of Al Atomic Chains : Effects of Bias Voltage and Structure

    Furuya S., Gohda Y., Sasaki N., Watanabe S.

    Meeting abstracts of the Physical Society of Japan   56 ( 2 )   754 - 754   2001.9

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  • Ab Initio Calculation of Field Emission Spectra from Nanostructures

    Gohda Y., Watanabe S.

    Meeting abstracts of the Physical Society of Japan   56 ( 2 )   755 - 755   2001.9

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  • Ab Initio Calculation of Field Emission Currents from Metals III.

    Gohda Y., Watanabe S.

    Meeting abstracts of the Physical Society of Japan   56 ( 1 )   831 - 831   2001.3

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  • Ab Initio Calculation of Field Emission Currents from Metals II.

    Gohda Y., Watanabe S.

    Meeting abstracts of the Physical Society of Japan   55 ( 2 )   805 - 805   2000.9

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  • Ab Inito Calculation of Field Emission Currcnts from Metals

    Gohda Y., Nakamura Y., Watanabe K., Watanabe S.

    Meeting abstracts of the Physical Society of Japan   55 ( 1 )   777 - 777   2000.3

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Research Projects

  • Electron theory of phase equilibria considering lattice vibrations in disorder phases

    Grant number:24K01144  2024.4 - 2028.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Grant amount:\18720000 ( Direct Cost: \14400000 、 Indirect Cost:\4320000 )

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  • Electron theory on magnetic elements and heavy elements in nanostructures

    Grant number:17K04978  2017.4 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    GOHDA Yoshihiro

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    Grant amount:\4680000 ( Direct Cost: \3600000 、 Indirect Cost:\1080000 )

    Computational frameworks for atomic arrangements and magnetic properties of nanostructures including magnetic elements and heavy elements were developed. Applications are made for interfaces between ferromagnetic Heusler compounds and BaTiO3. Relation between interface atomic structures and magnetic properties were clarified. In addition, strain effects due to the change in the electric polarization on magnetic properties were identified.
    Furthermore, a new theoretical method for finite temperature magnetism was developed on the basis of first-princples electron theory.

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  • 磁性金属におけるハイブリッド密度汎関数理論の新展開

    Grant number:25104705  2013.4 - 2015.3

    日本学術振興会  科学研究費助成事業 新学術領域研究(研究領域提案型)  新学術領域研究(研究領域提案型)

    合田 義弘

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    Grant amount:\3900000 ( Direct Cost: \3000000 、 Indirect Cost:\900000 )

    一般化されたKoopmansの定理を活用する事により、一粒子準位の満たすべき厳密な条件を用いてハイブリッド密度汎関数における混合パラメーターを第一原理的に決定した。その結果、歪んだ岩塩構造を取るタイプII反強磁性状態のNiOでは、電荷移動型絶縁体の電子状態を再現し、各軌道キャラクターのエネルギー位置も実験と矛盾しない結果が得られた。しかしながら、Mott-Hubbard絶縁体であるFeOに対してはdバンドの各状態それぞれに対して、大きく異なる混合パラメーターが得られた。また、これらの物質群に対する混合パラメーターはより大きな局在性のため、窒素化合物中の遷移金属不純物に対するものより大きい事が分かった。本研究における混合パラメーターの最適化法はDFT+U法のUの値の最適化にも用いる事ができる事を指摘した。一方で、既存の理論も含めた様々な手法による磁性金属の第一原理計算を実行し、磁性金属材料の電子状態の理解も深化させた。具体的には、原子サイト毎に磁気異方性の寄与を分解する手法を開発し、Y2Fe14Bなどのバルク磁性体に適用する事によりその有効性を確認した。さらにY2Fe14Bにおける磁気異方性の歪みによる制御可能性を見出し、その磁気異方性変調のメカニズムを明らかにした。磁性材料微細構造組織界面に対しても本手法を適用し、界面等における局所的な磁気異方性の効果を定量的に評価した。本研究により開発された磁気異方性解析手法は簡便かつ適用範囲が広く今後の応用が期待される。

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  • Studies on Structure Sampling and Non-Equilibrium Dynamics Using Ab-Initio Molecular Dynamics Methods

    Grant number:22104006  2010.4 - 2015.3

    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)

    TSUNEYUKI Shinji, OTANI Minoru, YOSHIMOTO Yoshihide, YAMAUCHI Jun, NAKAYAMA Takashi, SUGINO Osamu, MORIKAWA Yoshitada, AKAGI Kazuto, TATEYAMA Yoshitaka, SUWA Yuji, GOHDA Yoshihiro

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    Grant amount:\67730000 ( Direct Cost: \52100000 、 Indirect Cost:\15630000 )

    This project is mainly dedicated to first-principles study on thermal physics and non-equilibrium dynamics in condensed matter. For long-time/large-scale simulation needed for the purpose, we developed "xTAPP", a highly parallelized and multi-functional program package for first-principles molecular dynamics simulation. We also developed an efficient scheme of modeling anharmonic interaction between atoms from first principles for accurate calculation of lattice thermal conductivity. For the simulation of electrochemical reaction, we extended the effective screening medium method previously proposed by one of our members, with which simulations of electrochemical reaction under arbitrary and constant bias voltage was realized. "xTAPP" and the program package "ALAMODE" for lattice thermal conductivity were published as open source codes.

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  • Control of spin properties at nitride-semiconductor interfaces

    Grant number:21710102  2009 - 2012

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)  Grant-in-Aid for Young Scientists (B)

    GOHDA Yoshihiro

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    Grant amount:\4420000 ( Direct Cost: \3400000 、 Indirect Cost:\1020000 )

    Theoretical investigations on magnetism based on first-principles calculations were conducted for interfaces between nitride-semiconductors such as GaN and non-magnetic materials. Prediction of interface ferromagnetism for AlN/MgB2 and its spin-transport properties were published in Physical Review Letters. In addition, findings on spin properties of GaN/graphene interfaces were disclosed in Applied Physics Letters.

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  • 強電界下におけるナノ構造の電子状態と電気特性の理論解析

    Grant number:02J08213  2002 - 2003

    日本学術振興会  科学研究費助成事業 特別研究員奨励費  特別研究員奨励費

    合田 義弘

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    Grant amount:\2000000 ( Direct Cost: \2000000 )

    電界及び電気伝導に関する物理現象は、エレクトロニクスと直接結び付いているという意味で極めて重要であり、ナノテクノロジーのブレイクスルーを目指して盛んに基礎研究が行われている。なかでも強電界を印加した表面から電子がトンネル効果により真空へ放出される現象である電界電子放出は、フラットパネルディスプレイ等への応用として工学的に重要であるばかりでなく、電界に対する固体表面の応答として基礎的にも非常に興味深い現象である。前年度では、水素終端シリコン表面からの電界電子放出の理論解析を行いその複雑な電子放出のメカニズムを明らかにした。
    本年度では、表面吸着原子構造の放出特性への影響を散乱状態をあらわに考慮しつつ密度汎関数法に基づき非経験的に理論解析した。吸着構造としてはSi(100)表面上のアルミニウムを例にとり、様々な吸着構造の放出特性への影響を解析した。その結果、アルミニウム吸着Si(100)表面の放出特性は清浄Si(100)表面および清浄Al(100)表面のいずれよりもよい事がわかった。また、放出特性を記述する指針として表面上の局所ポテンシャル障壁の最小値に着目することが有効である事もわかった。さらに、アルミニウム吸着Si(100)表面の電子放出のメカニズムとしてアルミニウムから基盤シリコン原子への電子移動が重要な役割を果たしていることが明らかになった。
    さらに、本年度では米国Vanderbilt大学において、分子によるナノ接合構造の電気伝導特性の理論解析を行った。電極との相互作用の大きいチオール接合では分子を帯電させるのは困難であることがわかった。さらに、電極と分子の相互作用を変化させる事により、分子を線形的に帯電させることも、電子一個単位で離散的に帯電させることもできることを明らかにした。
    (研究期間:平成15年5月〜平成16年3月)

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