Butsuri
Online ISSN : 2423-8872
Print ISSN : 0029-0181
ISSN-L : 0029-0181
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Volume 76, Issue 6
Displaying 1-19 of 19 articles from this issue
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Preface
Contents
Overview Articles
Researches
  • Chirality Conversion of Chiral Crystals under Grinding
    Hiroyasu Katsuno, Makio Uwaha
    Article type: Researches
    2021 Volume 76 Issue 6 Pages 349-354
    Published: June 05, 2021
    Released on J-STAGE: June 05, 2021
    DOIhttps://doi.org/10.11316/butsuri.76.6_349
    JOURNAL FREE ACCESS
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    Molecules, either chiral or achiral, sometimes form chiral structures in crystallization. Viedma discovered a remarkable chirality conversion of crystals by simply grinding crystals in a solution. Although the phenomenon is simple, the underlying mechanism is still controversial. In this article, by using a simple reaction model and generalized Becker–Döring model, we show that the idea of cluster incorporation to crystals can explain various anomalous features of related experiments.

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  • Do Excitonic Insulators Exist?
    Takashi Mizokawa, Kozo Okazaki
    Article type: Researches
    2021 Volume 76 Issue 6 Pages 355-359
    Published: June 05, 2021
    Released on J-STAGE: June 05, 2021
    DOIhttps://doi.org/10.11316/butsuri.76.6_355
    JOURNAL FREE ACCESS
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    When Coulomb interaction between holes and electrons is not screened well in a semimetal or a narrow gap semiconductor, the holes and electrons may undergo coherent formation of excitons and the system may fall in an excitonic insulator. We have studied the electronic structure of Ta2NiSe5 which is one of the candidates for the excitonic insulator. The Ni 2p core level photoemission suggests that Ni 3d band is partly unoccupied indicating unusual hybridization between the Ni 3d valence band and the Ta 5d conduction band. By means of state-of-the-art time-resolved ARPES, we have realized a photoinduced phase transition from the possible excitonic insulator phase to a semimetal phase in Ta2NiSe5 and related systems. The ultrafast dynamics of the photoinduced phase transition indicates that Ta2NiSe5 can be viewed as an excitonic insulator with direct band gap.

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  • Non-Markovian Stochastic Processes in Physics ―Field-Theoretical Solution to the Hawkes Process
    Kiyoshi Kanazawa
    Article type: Researches
    2021 Volume 76 Issue 6 Pages 360-364
    Published: June 05, 2021
    Released on J-STAGE: June 05, 2021
    DOIhttps://doi.org/10.11316/butsuri.76.6_360
    JOURNAL FREE ACCESS
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    A theoretical solution to the self-excited Hawkes process is reviewed on the basis of the Markov embedding and field master equation. This review is based on our two articles: K. Kanazawa and D. Sornette, Phys. Rev. Lett. 125, 138301(2020) and Phys. Rev. Res. 2, 033442(2020).

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