Butsuri
Online ISSN : 2423-8872
Print ISSN : 0029-0181
ISSN-L : 0029-0181
Volume 75 , Issue 5
Showing 1-20 articles out of 20 articles from the selected issue
Preface
Contents
Reviews
Researches
  • Yuzuru Sato
    Type: Researches
    2020 Volume 75 Issue 5 Pages 274-278
    Published: May 05, 2020
    Released: October 14, 2020
    JOURNAL FREE ACCESS

    Stochastic chaos in random dynamical systems is overviewed in relation to noise-induced phenomena, stochastic bifurcation, and time series analysis. Moreover our recent study on a random strange attractor in the von Karman swirling flow is reviewed.

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  • Norio Okabayashi
    Type: Researches
    2020 Volume 75 Issue 5 Pages 279-283
    Published: May 05, 2020
    Released: October 14, 2020
    JOURNAL FREE ACCESS

    Inelastic electron tunneling spectroscopy (IETS) combined with scanning tunneling microscopy (STM) is a powerful tool for investigating the vibrational energies of a single molecule at the atomic scale resolution. However, it is known that the intensity of IETS varies strongly for various tips, and the vibrational energies acquired by IETS are significantly influenced by the distance between the tip and molecule. To overcome the aforementioned problems, we have incorporated atomic force microscopy into STM-IETS in collaboration with Franz J. Giessibl of Regensburg University. Consequently, we have found that a metallic tip whose apex consists of a single atom provides a stronger IETS signal to the CO molecule on a Cu (111) surface, whereas a metallic tip whose apex consists of multiple atoms provides a weaker IETS signal. Further, we have found that the vibrational energies of the CO molecule are highly influenced by a tip that exerts a stronger force. Subsequently, these findings have been rationalized by a classical mechanical model assuming that the motion of the CO molecule is similar to that of a double pendulum, where the perturbation force between the tip and molecule and the weakening of the chemical bond because of the tip are taken into account.

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  • Koji Yamaguchi, Masahiro Hotta
    Type: Researches
    2020 Volume 75 Issue 5 Pages 284-288
    Published: May 05, 2020
    Released: October 14, 2020
    JOURNAL FREE ACCESS

    We review the notion of quantum information capsule as a new information carrier in entangled quantum systems. Its applications to chaotic systems and communication protocols are presented.

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  • Motohiko Ezawa
    Type: Researches
    2020 Volume 75 Issue 5 Pages 289-294
    Published: May 05, 2020
    Released: October 14, 2020
    JOURNAL FREE ACCESS

    We review a recent progress on higher-order topological systems. We start with a brief history of higher-order topological insulators (HOTIs). Then, we discuss two types of HOTIs. One is the Wannier-type HOTIs, which are extensions of the Su–Schrieffer–Heeger model, and the others are mass-type HOTIs, which are constructed based on topological insulators by adding extra terms. We also explain how these systems are realized in electric circuits. Finally, we extend the notion to non-Hermitian topological systems, where non-Hermitian terms are introduced by dissipation or nonreciprocity.

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