Butsuri
Online ISSN : 2423-8872
Print ISSN : 0029-0181
ISSN-L : 0029-0181
Volume 74 , Issue 1
Showing 1-21 articles out of 21 articles from the selected issue
Preface
Contents
Artificial Intelligence and Physics
Reviews
  • Hiroshi Sawa
    Type: Reviews
    2019 Volume 74 Issue 1 Pages 14-23
    Published: January 05, 2019
    Released: July 10, 2019
    JOURNALS RESTRICTED ACCESS

    We succeeded in observing the electron distribution of a Frontier orbital in a molecular crystal using synchrotron radiation single crystal X-ray diffraction data obtained at SPring-8. This method of extracting only the valence electron information by subtracting the core electron distribution from the total electron density was named the core differential Fourier synthesis (CDFS) method. In order to propose such a new method, it is indispensable to verify whether the electronic state of a well-known material investigated can be explained accurately. Therefore, we selected a typical quasi one-dimensional molecular conductor (TMTTF)2PF6 and examined the accuracy of this method. The first report of this molecular system was in 1978. The charge disproportionation in the charge-ordered phase suggested by the dielectric constant measurement could not observe direct structural evidence and was called “structure-less transition” as a mystery for 40 years. We clarified the electronic cloud of the HOMO of TMTTF molecule by CDFS method and elucidated the details of charge order. The CDFS method can be applied not only to molecular crystals but also to a variety of materials such as transition metal oxides. Here we introduce the principle, experimental conditions necessary for measurement and analysis methods.

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  • Kenji Ishida, Dai Aoki
    Type: Reviews
    2019 Volume 74 Issue 1 Pages 24-33
    Published: January 05, 2019
    Released: July 10, 2019
    JOURNALS RESTRICTED ACCESS

    U-based ferromagnetic superconductors of UCoGe and URhGe are reviewed. In these superconductors, there are various experimental evidences that superconductivity is induced by the longitudinal ferromagnetic fluctuations and that the spin triplet pairing is formed. We show these results and the theoretical calculations to explain the results based on the spin-triplet superconductivity mediated by ferromagnetic fluctuations.

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Researches
  • Sanefumi Moriyama, Tomoki Nosaka
    Type: Researches
    2019 Volume 74 Issue 1 Pages 34-39
    Published: January 05, 2019
    Released: July 10, 2019
    JOURNALS RESTRICTED ACCESS

    This article explains recent explorations of M-theory, which is expected to be the theory of everything. We especially focus on the developments in the matrix model derived from the worldvolume theory of M2-branes. It is found that the parameter space characterizing the M-theory satisfies the symmetry of integrability and the exceptional group.

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  • Kenichi L. Ishikawa, Takeshi Sato
    Type: Researches
    2019 Volume 74 Issue 1 Pages 40-45
    Published: January 05, 2019
    Released: July 10, 2019
    JOURNALS RESTRICTED ACCESS

    We present the time-dependent multiconfiguration self-consistent-field (TD-MCSCF) methods to simulate, from the first principles, multielectron dynamics in atoms and molecules subject to intense laser fields. Our TD-MCSCF methods introduce flexible orbital subspace decomposition, conforming to phenomena under investigation and desired accuracy. Infinite-range exterior complex scaling in addition to mask-function boundary is adopted as an efficient absorbing boundary. We show illustrative numerical examples.

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