Butsuri

Online ISSN : 2423-8872
Print ISSN : 0029-0181
ISSN-L : 0029-0181

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Volume 79, Issue 2

Displaying 1-17 of 17 articles from this issue

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Preface

Is Our Passion Reached?

Shoji Hashimoto

Article type: Preface
2024 Volume 79 Issue 2 Pages 51
Published: February 05, 2024
Released on J-STAGE: February 05, 2024

DOIhttps://doi.org/10.11316/butsuri.79.2_51

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Contents

Contents

Article type: Contents
2024 Volume 79 Issue 2 Pages 52-53
Published: February 05, 2024
Released on J-STAGE: February 05, 2024

DOIhttps://doi.org/10.11316/butsuri.79.2_52

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Overview Articles

Physics of Excitonic Insulators―Orders and Collective Excitations Derived from Interband Interactions

Tatsuya Kaneko, Yukinori Ohta

Article type: Overview Articles
2024 Volume 79 Issue 2 Pages 54-62
Published: February 05, 2024
Released on J-STAGE: February 05, 2024

DOIhttps://doi.org/10.11316/butsuri.79.2_54

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In this article, we present a brief review of the physics of excitonic insulators described as an ordered state of electron and hole pairs. First, we review the theoretical background of the excitonic insulator. Then, we introduce candidate materials for the excitonic insulator that are addressed by recent experiments. Finally, we discuss the collective modes of the excitonic order coupled to phonons and their optical properties.

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Researches

Thermal Photons and Non-Equilibrium Magnons

Motoaki Bamba

Article type: Researches
2024 Volume 79 Issue 2 Pages 63-67
Published: February 05, 2024
Released on J-STAGE: February 05, 2024

DOIhttps://doi.org/10.11316/butsuri.79.2_63

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Magnon-mediated Dicke cooperativity has been observed in ErFeO₃. A superradiant phase transition by ultrastrong magnon–spin coupling has also been confirmed. The low-temperature phase transition in ErFeO₃ would be a key phenomenon bridging the thermal-equilibrium and non-equilibrium physics.

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Multiscale Space-Time Ansatz Based on Quantics Tensor Trains for Quantum Field Theories

Hiroshi Shinaoka, Yuta Murakami, Kosuke Nogaki, Rihito Sakurai

Article type: Researches
2024 Volume 79 Issue 2 Pages 68-72
Published: February 05, 2024
Released on J-STAGE: February 05, 2024

DOIhttps://doi.org/10.11316/butsuri.79.2_68

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We propose a new compression method for correlation functions, i.e. quantics tensor train (QTT), based on length-scale separations in space and time. In QTT, a correlation function is represented as a Matrix Product State (MPS). Discrete Fourier Transformation and convolution can be performed efficiently using a Matrix Product Operator (MPO). Numerous examples, ranging from equilibrium to non-equilibrium problems, demonstrate the high efficiency of QTT.

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Test of Superconducting Electron Pairing Mediated by Quantum Liquid Crystal Fluctuations

Kousuke Ishida, Takasada Shibauchi

Article type: Researches
2024 Volume 79 Issue 2 Pages 73-78
Published: February 05, 2024
Released on J-STAGE: February 05, 2024

DOIhttps://doi.org/10.11316/butsuri.79.2_73

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In this article, we present a review of our recent findings on FeSe_1-xTe_x superconductors, which exhibit an electronic nematic order, one of the quantum liquid crystal phases. Elastoresistivity measurements have provided evidence for a pure nematic quantum critical point lying beneath the superconducting dome of FeSe_1-xTe_x. Through an analysis of the upper critical field measurements, we have found that superconducting pairing is strengthend as approaching this quantum critical point. These observations demonstrate the significant role played by fluctuations of the quantum liquid crystal phase in promoting and influencing superconductivity.

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Crossroad

IPhO2023―The International Physics Olympiad 2023 in JAPAN

Ryugo Hayano

Article type: Crossroad
2024 Volume 79 Issue 2 Pages 79-82
Published: February 05, 2024
Released on J-STAGE: February 05, 2024

DOIhttps://doi.org/10.11316/butsuri.79.2_79

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2024 Volume 79 Issue 2 Pages 83-84
Published: February 05, 2024
Released on J-STAGE: February 05, 2024

DOIhttps://doi.org/10.11316/butsuri.79.2_83

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2024 Volume 79 Issue 2 Pages 85-86
Published: February 05, 2024
Released on J-STAGE: February 05, 2024

DOIhttps://doi.org/10.11316/butsuri.79.2_85

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2024 Volume 79 Issue 2 Pages 87-93
Published: February 05, 2024
Released on J-STAGE: February 05, 2024

DOIhttps://doi.org/10.11316/butsuri.79.2_87

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2024 Volume 79 Issue 2 Pages 94
Published: February 05, 2024
Released on J-STAGE: February 05, 2024

DOIhttps://doi.org/10.11316/butsuri.79.2_94_1

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2024 Volume 79 Issue 2 Pages 94-95
Published: February 05, 2024
Released on J-STAGE: February 05, 2024

DOIhttps://doi.org/10.11316/butsuri.79.2_94_2

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2024 Volume 79 Issue 2 Pages 96-99
Published: February 05, 2024
Released on J-STAGE: February 05, 2024

DOIhttps://doi.org/10.11316/butsuri.79.2_96

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2024 Volume 79 Issue 2 Pages 99-100
Published: February 05, 2024
Released on J-STAGE: February 05, 2024

DOIhttps://doi.org/10.11316/butsuri.79.2_99

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2024 Volume 79 Issue 2 Pages 101-102
Published: February 05, 2024
Released on J-STAGE: February 05, 2024

DOIhttps://doi.org/10.11316/butsuri.79.2_101

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2024 Volume 79 Issue 2 Pages 103
Published: February 05, 2024
Released on J-STAGE: February 05, 2024

DOIhttps://doi.org/10.11316/butsuri.79.2_103

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2024 Volume 79 Issue 2 Pages 104
Published: February 05, 2024
Released on J-STAGE: February 05, 2024

DOIhttps://doi.org/10.11316/butsuri.79.2_104

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