Butsuri
Online ISSN : 2423-8872
Print ISSN : 0029-0181
ISSN-L : 0029-0181
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Volume 79, Issue 1
Displaying 1-19 of 19 articles from this issue
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Preface
Contents
Interdisciplinary
  • Economic Phenomena and Complex Network Science
    Yoshi Fujiwara
    Article type: Interdisciplinary
    2024 Volume 79 Issue 1 Pages 4-11
    Published: January 05, 2024
    Released on J-STAGE: January 05, 2024
    DOIhttps://doi.org/10.11316/butsuri.79.1_4
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    Macro economy comprises heterogeneous and interacting agents such as firms, banks, and consumers. How they are interconnected among themselves, namely economic networks, are crucial for understanding supply and demand shocks, price fluctuations (inflation and deflation), propagation of economic shocks due to exogeneous events including natural disasters and financial crises.

    A large amount of data have been accumulated and available to such an extent to observe the economic networks in details at nationwide or worldwide scales. Complex network science and related studies have been helpful to investigate a variety of economic and social networks based on the detailed observation. Recent examples of such studies are shown in this manuscript.

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Researches
  • Terahertz Higher Harmonic Generation in a Three Dimensional Dirac Semimetal
    Ryusuke Matsunaga, Natsuki Kanda, Tatsuhiko N. Ikeda
    Article type: Researches
    2024 Volume 79 Issue 1 Pages 12-17
    Published: January 05, 2024
    Released on J-STAGE: January 05, 2024
    DOIhttps://doi.org/10.11316/butsuri.79.1_12
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    We have studied nonlinear response and terahertz (～1012 Hz) higher harmonic generation in thin films of Cd3As2 , a three-dimensional Dirac semimetal. Nonperturbative third harmonic generation was clearly observed at room temperature using a tabletop light source. Unprecedented efficiency for the terahertz frequency conversion was discussed with a microscopic picture considering the intraband acceleration of electrons near the Dirac node. The results pave the way toward novel devices for high-speed electronics and photonics based on topological semimetals.

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  • Spin Coherence of Solid-State Spin Qubit
    Shun Kanai
    Article type: Researches
    2024 Volume 79 Issue 1 Pages 18-23
    Published: January 05, 2024
    Released on J-STAGE: January 05, 2024
    DOIhttps://doi.org/10.11316/butsuri.79.1_18
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    The electron spin coherence time of the solid-state spin qubit is predicted to screen quantum materials. An algebraic representation of electron spin coherence in materials was obtained by the generalized scaling of spin coherence with the electron and nuclear spin characteristics. The materials with long spin coherence are obtained by using the expression, pointing to the oxides and chalcogenides as potential qubit materials.

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  • Non-Destructive Elemental Analysis of the C-Type Asteroid Ryugu with Negative Muon Beams―Determination of Bulk Chemistry of Ryugu Samples
    Kentaro Terada, Kazuhiko Ninomiya
    Article type: Researches
    2024 Volume 79 Issue 1 Pages 24-29
    Published: January 05, 2024
    Released on J-STAGE: January 05, 2024
    DOIhttps://doi.org/10.11316/butsuri.79.1_24
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    We have been developing a non-destructive muonic X-ray analysis for extraterrestrial materials. Ten coarse Ryugu samples, which were allocated to the initial analysis STONE team, have been investigated at J-PARC MUSE. Significant muonic X-rays of C, N, O, Na, Mg, Si, S and Fe were detected from Ryugu and CI chondrite (Orgueil). These elemental ratios are in a good agreement with the reported values for CI chondrites, except for the 25% lower O/Si ratio for Ryugu relative to CI. This means that Ryugu is depleted of oxygen by 11.3% by mass compared to CI, assuming similar Si concentration for Ryugu to CI chondrites.

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