Butsuri
Online ISSN : 2423-8872
Print ISSN : 0029-0181
ISSN-L : 0029-0181
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Volume 78, Issue 3
Displaying 1-18 of 18 articles from this issue
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Preface
Contents
Interdisciplinary
Overview Articles
  • Ultra- and Deep-Strong Coupling Regimes of Cavity QED
    Tomohiro Shitara, Kazuki Koshino
    Article type: Overview Articles
    2023 Volume 78 Issue 3 Pages 125-134
    Published: March 05, 2023
    Released on J-STAGE: March 06, 2023
    DOIhttps://doi.org/10.11316/butsuri.78.3_125
    JOURNAL FREE ACCESS
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    Cavity Quantum Electrodynamics (QED) studies the light-matter coupling in one of the simplest settings. Recently, the ultra- and deep-strong coupling regimes have been experimentally realized, where the coupling g is comparable or even greater than the transition energies of components such as cavity modes and atoms. We review the mysterious phenomenon in this regime caused by the anti-rotating terms in the coupling Hamiltonian.

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Researches
  • Phonon Dispersion of Organic Semiconductors
    Yusuke Wakabayashi, Ikutaro Hamada, Satoshi Tsutsui
    Article type: Researches
    2023 Volume 78 Issue 3 Pages 135-139
    Published: March 05, 2023
    Released on J-STAGE: March 06, 2023
    DOIhttps://doi.org/10.11316/butsuri.78.3_135
    JOURNAL FREE ACCESS
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    Although the importance of the lattice vibration in organic crystals is recognized, experimental observation of the phonon in molecular crystals has been scarce. Here, we demonstrate the phonon dispersion measurement by means of the inelastic x-ray scattering technique assisted by the density functional theory calculation on the most studied high-mobility organic semiconductor, rubrene single crystal.

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  • Work Relation for Determining the Mixing Free Energy in Small Scale Mixtures
    Akira Yoshida, Naoko Nakagawa
    Article type: Researches
    2023 Volume 78 Issue 3 Pages 140-145
    Published: March 05, 2023
    Released on J-STAGE: March 06, 2023
    DOIhttps://doi.org/10.11316/butsuri.78.3_140
    JOURNAL FREE ACCESS
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    We propose a Jarzynski-type work relation for determining mixing free energy. It contains two kinds of work required in two alchemical protocols. We then evaluate the Gibbs factorial numerically by comparing the free energies of a mixture calculated from alchemical and non-alchemical procedures. Finally, we formulate the Gibbs factorial as a quasistatic work of classical systems defined by an operation of many-body potential with permutation symmetry.

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  • Theory of Spin Hall (Nernst) Effect without Spin Current
    Atsuo Shitade
    Article type: Researches
    2023 Volume 78 Issue 3 Pages 146-151
    Published: March 05, 2023
    Released on J-STAGE: March 06, 2023
    DOIhttps://doi.org/10.11316/butsuri.78.3_146
    JOURNAL FREE ACCESS
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    Spin Hall (Nernst) effect has been recognized as a response of “spin current” to an electric field (a temperature gradient). However, “spin current” is ill defined in the presence of a spin-orbit coupling, which is the origin of these phenomena. Here, we propose a new formalism focusing on the spin accumulation at the boundaries. We consider the responses of spin to the gradients of the electric field and temperature gradient, and prove the generalized Mott relation between them and Onsager’s reciprocity relation. This formalism provides a new charge (heat)-spin conversion efficiency that can be evaluated by first-principles calculations.

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