发布求助
文献互助 智能选刊 最新文献

Journal of the Physical Society of Japan最新文献

筛选
英文 中文
A Study of Oscillating Magnetic Fields with Neutron Spin Interferometry 利用中子自旋干涉测量法研究振荡磁场
IF 1.7 4区 物理与天体物理
Journal of the Physical Society of Japan Pub Date : 2024-05-28 DOI: 10.7566/jpsj.93.091008
Takaya Suzuki, Ryuto Fujitani, Seiji Tasaki, Masahiro Hino, Masaaki Kitaguchi, Tatsuro Oda, Riichiro Nakamura
{"title":"A Study of Oscillating Magnetic Fields with Neutron Spin Interferometry","authors":"Takaya Suzuki, Ryuto Fujitani, Seiji Tasaki, Masahiro Hino, Masaaki Kitaguchi, Tatsuro Oda, Riichiro Nakamura","doi":"10.7566/jpsj.93.091008","DOIUrl":"https://doi.org/10.7566/jpsj.93.091008","url":null,"abstract":"In this study, we evaluate spin interferometry with high-frequency magnetic fields using a continuous neutron beam. We derive an analytical formula for neutron spin interference with oscillating magnetic fields parallel to the quantization axis. The formula indicates that the phase of the interference pattern was not shifted but its amplitude, or visibility, was reduced by the oscillating magnetic fields. The experiment at MINE2 effectively reproduced this phenomenon and the degree of the amplitude reduction also followed the formula. Monochromatic neutron beams with long wavelengths such as 8.8 Å at MINE2 make it easy to polarize the beams to conduct high-visibility spin interferometric experiments. As a result, MINE2 is useful for testing new aspects of phenomena based on neutron spin optics.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"64 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141173470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Soft Mode Behavior Near the Critical Endpoint of a Nematic Liquid Crystal with Positive Dielectric Anisotropy 具有正介电各向异性的向列液晶临界端点附近的软模式行为
IF 1.7 4区 物理与天体物理
Journal of the Physical Society of Japan Pub Date : 2024-05-27 DOI: 10.7566/jpsj.93.064004
Yoshinori Takikawa, Taro Tamehiro, Makoto Iwata, Hiroshi Orihara
{"title":"Soft Mode Behavior Near the Critical Endpoint of a Nematic Liquid Crystal with Positive Dielectric Anisotropy","authors":"Yoshinori Takikawa, Taro Tamehiro, Makoto Iwata, Hiroshi Orihara","doi":"10.7566/jpsj.93.064004","DOIUrl":"https://doi.org/10.7566/jpsj.93.064004","url":null,"abstract":"A critical endpoint appears when a DC electric field is applied to a nematic liquid crystal with positive dielectric anisotropy. We have investigated the soft mode behavior near the critical endpoint of the nematic liquid crystal 8CB by dielectric spectroscopy while finely varying the temperature and DC electric field around it. Using an expression for the dielectric constant derived from the Landau–de Gennes theory, we obtained the relaxation strength and frequency for the soft mode from dielectric dispersions. An increase in relaxation strength and a decrease in relaxation frequency were observed as the critical endpoint was approached, which was expected from the theory.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"2 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141166749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effective Mass and Field-Reinforced Superconductivity in Uranium Compounds 铀化合物中的有效质量和场强化超导性
IF 1.7 4区 物理与天体物理
Journal of the Physical Society of Japan Pub Date : 2024-05-27 DOI: 10.7566/jpsj.93.064705
Vladimir P. Mineev
{"title":"Effective Mass and Field-Reinforced Superconductivity in Uranium Compounds","authors":"Vladimir P. Mineev","doi":"10.7566/jpsj.93.064705","DOIUrl":"https://doi.org/10.7566/jpsj.93.064705","url":null,"abstract":"A theory of strong coupling superconductivity in uranium compounds has been developed, based on electron–electron interaction through magnetic fluctuations described by frequency-dependent magnetic susceptibility. The magnetic field dependence of the electron effective mass is expressed through the field dependence of the magnetic susceptibility components. It is shown that the intensity of triplet pairing, and hence the critical temperature of the transition to the superconducting state, is also determined by the field-dependent susceptibility. The results are discussed in relation to the properties of ferromagnetic uranium compounds URhGe and UCoGe, as well as the recently discovered UTe<sub>2</sub>.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"27 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141166751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Microscopic Derivation of Transition-state Theory for Complex Quantum Systems 复杂量子系统过渡态理论的微观推导
IF 1.7 4区 物理与天体物理
Journal of the Physical Society of Japan Pub Date : 2024-05-24 DOI: 10.7566/jpsj.93.064003
Kouichi Hagino, George F. Bertsch
{"title":"Microscopic Derivation of Transition-state Theory for Complex Quantum Systems","authors":"Kouichi Hagino, George F. Bertsch","doi":"10.7566/jpsj.93.064003","DOIUrl":"https://doi.org/10.7566/jpsj.93.064003","url":null,"abstract":"The decay of quantum complex systems through a potential barrier is often described with transition-state theory, also known as RRKM theory in chemistry. Here we derive the basic formula for transition-state theory based on a generic Hamiltonian as might be constructed in a configuration-interaction basis. Two reservoirs of random Hamiltonians from Gaussian orthogonal ensembles are coupled to intermediate states representing the transition states at a barrier. Under the condition that the decay of the reservoirs to open channels is large, an analytic formula for reaction rates is derived. The transition states act as independent Breit–Wigner resonances which contribute additively to the total transition probability, as is well known for electronic conductance through resonant tunneling states. It is also found that the transition probability is independent of the decay properties of the states in the second reservoir over a wide range of decay widths.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"52 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141146519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Equilibrium Flow Structure with Multiple Ion Species in Magnetically Confined Plasmas of an Arbitrary Aspect Ratio 任意长宽比磁约束等离子体中多种离子的平衡流动结构
IF 1.7 4区 物理与天体物理
Journal of the Physical Society of Japan Pub Date : 2024-05-24 DOI: 10.7566/jpsj.93.064501
Yusuke Kosuga
{"title":"Equilibrium Flow Structure with Multiple Ion Species in Magnetically Confined Plasmas of an Arbitrary Aspect Ratio","authors":"Yusuke Kosuga","doi":"10.7566/jpsj.93.064501","DOIUrl":"https://doi.org/10.7566/jpsj.93.064501","url":null,"abstract":"Equilibrium flows of impure plasmas in magnetically confined plasmas of arbitrary aspect ratio are calculated by neoclassical theory. For magnetically confined plasmas with the inverse aspect ratio approaching unity from below, the variation of the magnetic field strength along the field becomes large and as a consequence strong Mirror force arises to trap particles in the magnetic mirror. Thus we expect poloidal flows are weak and we show that this is indeed true for ion and impurity flows by using the Moment approach in banana regime. In contrast, it is shown that appreciable amount of flows exist in collisional regime. Collisional impurities in the spherical tokamak edge are used as a prototypical example of such a case. The flow exhibits strong poloidal variation. As a consequence, strong effective parallel flow shear accumulates in the high field side. Implications on controlling fluctuations and meso-scale structures are discussed.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"48 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141146518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Still Mystery after All These Years —Unconventional Superconductivity of Sr2RuO4— 多年后仍是谜 - Sr2RuO4- 的非常规超导性
IF 1.7 4区 物理与天体物理
Journal of the Physical Society of Japan Pub Date : 2024-05-22 DOI: 10.7566/jpsj.93.062001
Yoshiteru Maeno, Shingo Yonezawa, Aline Ramires
{"title":"Still Mystery after All These Years —Unconventional Superconductivity of Sr2RuO4—","authors":"Yoshiteru Maeno, Shingo Yonezawa, Aline Ramires","doi":"10.7566/jpsj.93.062001","DOIUrl":"https://doi.org/10.7566/jpsj.93.062001","url":null,"abstract":"This review describes recent significant research developments made on the layered perovskite Sr<sub>2</sub>RuO<sub>4</sub> and discusses current issues from both experimental and theoretical perspectives. Since the discovery of superconductivity in Sr<sub>2</sub>RuO<sub>4</sub> in 1994, studies using high-quality single crystals quickly revealed it to be an archetypal unconventional superconductor among strongly correlated electron systems. In particular, it was thought that the spin-triplet chiral <i>p</i>-wave superconducting state, which breaks time-reversal symmetry, was a prominent possibility. In 2019, however, a new development overturned the past experimental results, and spin-singlet-like behavior became conclusive. Furthermore, innovation in uniaxial strain devices has stimulated researchers to explore changes in the superconducting state by controlling the symmetry and dimensionality of the Fermi surfaces and enhancing the superconducting transition temperature <i>T</i><sub>c</sub> from 1.5 to 3.5 K. A spin-singlet chiral <i>d</i>-wave superconducting state is consistent with most of these recent experimental results. Nevertheless, there are still unnatural aspects that remain to be explained. The focus of this review is on unraveling this mystery. Unlike many other unconventional superconductors, the normal state of Sr<sub>2</sub>RuO<sub>4</sub> exhibits typical Fermi liquid behavior. Nevertheless, to elucidate its superconducting state, it may be essential to go beyond the traditional framework of unconventional superconductivity and recast the theory explicitly considering the multi-orbital aspects of its electronic states. In this review, we describe the frontiers of superconductivity research in Sr<sub>2</sub>RuO<sub>4</sub> and discuss how the remaining issues may be resolved.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"47 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141146520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Hybrid Higher-Order Skin Topological Modes in the Two-Dimensional Su–Schrieffer–Heeger Model with Nonreciprocal Hoppings 具有非互惠跳频的二维苏-施里弗-希格模型中的混合高阶表皮拓扑模式
IF 1.7 4区 物理与天体物理
Journal of the Physical Society of Japan Pub Date : 2024-05-20 DOI: 10.7566/jpsj.93.064702
Hiromasa Wakao
{"title":"Hybrid Higher-Order Skin Topological Modes in the Two-Dimensional Su–Schrieffer–Heeger Model with Nonreciprocal Hoppings","authors":"Hiromasa Wakao","doi":"10.7566/jpsj.93.064702","DOIUrl":"https://doi.org/10.7566/jpsj.93.064702","url":null,"abstract":"The coexistence of edge states and skin effects provides the topologically protected localized states at the corners of two-dimensional systems. In this paper, we realize such corner states in the two-dimensional Su–Schrieffer–Heeger model with the nonreciprocal hoppings. For the characterization of the real line gap topology, we introduce the <tex-math space=\"preserve\" version=\"MathJax\">(mathbb{Z}_{4})</tex-math> Berry phase protected by generalized four-fold rotational symmetry. From the physical picture of the adiabatic connection, we find that the value of the <tex-math space=\"preserve\" version=\"MathJax\">(mathbb{Z}_{4})</tex-math> Berry phase predicts the position of edge states. Additionally, by using the winding number, we characterize the point gap topology of the edge spectra. From the results of these characterizations by the first-order topological invariants, we find that the pair of values of the <tex-math space=\"preserve\" version=\"MathJax\">(mathbb{Z}_{4})</tex-math> Berry phase and the winding number yields the position of the topologically protected localized states.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"10 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141146521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Superconductivity in Metal-Rich Antimonide Zr6FeSb2 富金属锑化物 Zr6FeSb2 的超导性
IF 1.7 4区 物理与天体物理
Journal of the Physical Society of Japan Pub Date : 2024-05-16 DOI: 10.7566/jpsj.93.065001
Ryohei Matsumoto, Ei Murakami, Ryohei Oishi, Sitaram Ramakrishnan, Atsutoshi Ikeda, Shingo Yonezawa, Toshiro Takabatake, Takahiro Onimaru, Minoru Nohara
{"title":"Superconductivity in Metal-Rich Antimonide Zr6FeSb2","authors":"Ryohei Matsumoto, Ei Murakami, Ryohei Oishi, Sitaram Ramakrishnan, Atsutoshi Ikeda, Shingo Yonezawa, Toshiro Takabatake, Takahiro Onimaru, Minoru Nohara","doi":"10.7566/jpsj.93.065001","DOIUrl":"https://doi.org/10.7566/jpsj.93.065001","url":null,"abstract":"The ternary iron antimonide Zr<sub>6</sub>FeSb<sub>2</sub> was synthesized by arc-melting method. The AC susceptibility and electrical resistivity revealed a superconducting transition at 1.3 K, which is between 4.7 and 0.76 K of recently reported ternary iron telluride superconductors Sc<sub>6</sub>FeTe<sub>2</sub> and Zr<sub>6</sub>FeTe<sub>2</sub>, respectively.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"36 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141060695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Generation of a Net Flow Using a Two-phase Büttiker–Landauer Ratchet Pump in a Nucleate Boiling Region 在核沸腾区使用两相布特克-兰道尔棘轮泵产生净流
IF 1.7 4区 物理与天体物理
Journal of the Physical Society of Japan Pub Date : 2024-05-10 DOI: 10.7566/jpsj.93.064402
Hideyuki Sugioka, Atsushi Miyauchi
{"title":"Generation of a Net Flow Using a Two-phase Büttiker–Landauer Ratchet Pump in a Nucleate Boiling Region","authors":"Hideyuki Sugioka, Atsushi Miyauchi","doi":"10.7566/jpsj.93.064402","DOIUrl":"https://doi.org/10.7566/jpsj.93.064402","url":null,"abstract":"Effective utilization of unused heat below 200 °C is a vital issue for a zero-emission society. Here, we propose a two-phase Büttiker–Landauer (BL) ratchet pump using nucleate boiling. Specifically, by fabricating a periodical structure consisting of hot regions (where bubbles and water rise) and cold regions (where water descends diagonally while dissipating heat), we demonstrate that a net flow of ∼13 mm/s can be generated in a nucleate boiling regime (e.g., 115 °C). In addition, we find that a net flow of ∼1 mm/s occurs even in a bubble-free temperature region (e.g., 80 °C), and thus our BL pump works both in temperature regions with and without bubbles seamlessly. Moreover, we explain our experimental results fairly well by proposing a simple model that considers buoyancy force due to the bubbles in a nucleate boiling region. Our findings should contribute to the effective use of energy in the future.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"35 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140926960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Convergence Acceleration of Markov Chain Monte Carlo-Based Gradient Descent by Deep Unfolding 通过深度展开加速基于马尔可夫链蒙特卡洛的梯度下降收敛
IF 1.7 4区 物理与天体物理
Journal of the Physical Society of Japan Pub Date : 2024-05-02 DOI: 10.7566/jpsj.93.063801
Ryo Hagiwara, Satoshi Takabe
{"title":"Convergence Acceleration of Markov Chain Monte Carlo-Based Gradient Descent by Deep Unfolding","authors":"Ryo Hagiwara, Satoshi Takabe","doi":"10.7566/jpsj.93.063801","DOIUrl":"https://doi.org/10.7566/jpsj.93.063801","url":null,"abstract":"This study proposes a trainable sampling-based solver for combinatorial optimization problems (COPs) using a deep-learning technique called deep unfolding. The proposed solver is based on the Ohzeki method that combines Markov-chain Monte-Carlo (MCMC) and gradient descent, and its step sizes are trained by minimizing a loss function. In the training process, we propose a sampling-based gradient estimation that substitutes auto-differentiation with a variance estimation, thereby circumventing the failure of back propagation due to the non-differentiability of MCMC. The numerical results for a few COPs demonstrated that the proposed solver significantly accelerated the convergence speed compared with the original Ohzeki method.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"161 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140841713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信