Journal of the Physical Society of Japan最新文献_第3页

Repetitive Infection Spreading and Directed Evolution in the Susceptible–Infected–Recovered–Susceptible Model 易感-感染-恢复-易感模型中的重复感染传播和定向进化

IF 1.7 4区物理与天体物理

Journal of the Physical Society of Japan Pub Date : 2024-04-15 DOI: 10.7566/jpsj.93.054801

Hidetsugu Sakaguchi, Keito Yamasaki

{"title":"Repetitive Infection Spreading and Directed Evolution in the Susceptible–Infected–Recovered–Susceptible Model","authors":"Hidetsugu Sakaguchi, Keito Yamasaki","doi":"10.7566/jpsj.93.054801","DOIUrl":"https://doi.org/10.7566/jpsj.93.054801","url":null,"abstract":"We study two simple mathematical models of an epidemic. First, we study the repetitive infection spreading in a simplified susceptible–infected–recovered–susceptible (SIRS) model including the effect of the decay of the acquired immunity. The model is an intermediate of the SIRS model including the recruitment and death terms and the SIR model in which the recovered population is assumed to be never infected again. When the decay rate δ of the acquired immunity is sufficiently low, multiple infection spreading occurs in spikes. The model equation can be reduced to a map when the decay rate δ is sufficiently low, and the spike-like multiple infection spreading is reproduced in the mapping. The period-doubling bifurcation and chaos are found in the simplified SIRS model with seasonal variations. The nonlinear phenomena are reproduced using the map. Next, we study coupled SIRS equations for the directed evolution where the mutation is expressed with a diffusion-type term. A type of reaction–diffusion equation is derived by the continuum approximation for the infected population I. The reaction–diffusion equation with the linear dependence of infection rate on the type space has an exact Gaussian solution with a time-dependent average and variance. The propagation of the Gaussian pulse corresponds to the successive transitions of the dominant variant.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"31 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140576412","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

Quantum Painlevé Second Lax Pair and Quantum (Matrix) Analogues of Classical Painlevé II Equation 量子潘列维第二拉克斯对和经典潘列维 II 方程的量子（矩阵）类似物

IF 1.7 4区物理与天体物理

Journal of the Physical Society of Japan Pub Date : 2024-04-11 DOI: 10.7566/jpsj.93.054001

Muhammad Waseem, Irfan Mahmood, Hira Sohail, Ejaz Hussain, Hosam O. Elansary

{"title":"Quantum Painlevé Second Lax Pair and Quantum (Matrix) Analogues of Classical Painlevé II Equation","authors":"Muhammad Waseem, Irfan Mahmood, Hira Sohail, Ejaz Hussain, Hosam O. Elansary","doi":"10.7566/jpsj.93.054001","DOIUrl":"https://doi.org/10.7566/jpsj.93.054001","url":null,"abstract":"In this article, we present a quantum Painlevé second Lax pair that explicitly involves the Planck constant ħ and an arbitrary field variable v which distinguish it from the existing Flaschka–Newell Painlevé second Lax pair. We show that Flaschka–Newell pair appears as a special case of our quantum Painlevé second Lax pair. It is shown that the compatibility of quantum Painlevé second Lax pair simultaneously yields a quantum Painlevé equation and a quantum commutation relation between field variable v and independent variable z. We also show that the field variable v with different choices yields various analogs of classical Painlevé second equation as matrix Painlevé second equation, derivative matrix Painlevé second equation, and noncommutative Painlevé second equation. Further, we construct the gauge equivalence of quantum Painlevé second Lax pair whose compatibility condition generates a quantum P34 equation involving ħ with power +1 that brings the classical P34 equation close to its quantum analogs as compared to the existing one which carries ħ with power +2.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"62 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140589315","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

Optimized Synthesis of Circuits for Diagonal Unitary Matrices with Reflection Symmetry 具有反射对称性的对角单元矩阵电路的优化合成

IF 1.7 4区物理与天体物理

Journal of the Physical Society of Japan Pub Date : 2024-04-11 DOI: 10.7566/jpsj.93.054002

Xinchi Huang, Taichi Kosugi, Hirofumi Nishi, Yu-ichiro Matsushita

{"title":"Optimized Synthesis of Circuits for Diagonal Unitary Matrices with Reflection Symmetry","authors":"Xinchi Huang, Taichi Kosugi, Hirofumi Nishi, Yu-ichiro Matsushita","doi":"10.7566/jpsj.93.054002","DOIUrl":"https://doi.org/10.7566/jpsj.93.054002","url":null,"abstract":"During the noisy intermediate-scale quantum (NISQ) era, it is important to optimize the quantum circuits in circuit depth and gate count, especially entanglement gates, including the CNOT gate. Among all the unitary operators, diagonal unitary matrices form a special class that plays a crucial role in many quantum algorithms/subroutines. Based on a natural gate set <tex-math space=\"preserve\" version=\"MathJax\">({ text{CNOT},R_{z}} )</tex-math>, quantum circuits for general diagonal unitary matrices were discussed in several previous works, and an optimal synthesis algorithm was proposed in terms of circuit depth. In this paper, we are interested in the implementation of diagonal unitary matrices with reflection symmetry, which has promising applications, including the realization of real-time evolution for first quantized Hamiltonians by quantum circuits. Owing to such a symmetric property, we show that the quantum circuit in the existing work can be further simplified and propose a constructive algorithm that optimizes the entanglement gate count. Compared to the previous synthesis methods for general diagonal unitary matrices, the quantum circuit by our proposed algorithm achieves nearly half the reduction in both the gate count and circuit depth.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"89 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140576439","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

Effect of Quadrupole and Hexadecapole Deformations of Target on Projectile 目标的四极和十六极变形对射弹的影响

IF 1.7 4区物理与天体物理

Journal of the Physical Society of Japan Pub Date : 2024-04-11 DOI: 10.7566/jpsj.93.054201

Narayanaswamy Manjunatha, Holaly Chandrashekara Shastry Manjunatha, Nagaraj Sowmya, Krishnachari Nagarathnamma Sridhar, Padhmaghatta Somashekaraih Prabhavathi

{"title":"Effect of Quadrupole and Hexadecapole Deformations of Target on Projectile","authors":"Narayanaswamy Manjunatha, Holaly Chandrashekara Shastry Manjunatha, Nagaraj Sowmya, Krishnachari Nagarathnamma Sridhar, Padhmaghatta Somashekaraih Prabhavathi","doi":"10.7566/jpsj.93.054201","DOIUrl":"https://doi.org/10.7566/jpsj.93.054201","url":null,"abstract":"To investigate the effect of the magnitude of deformations on heavy-ion fusion reactions, we have considered reactions in such a way that the deformations of the target varied whereas that of the projectile remained the same. Using an advanced statistical model, we investigated fusion reactions of 4He+233–238U, 48Ca+204–208Pb, and 48Ca+240–244Pu. The influence of quadrupole and hexadecapole deformations on Coulomb potential was considered. The fusion cross-sections and evaporation residue cross-sections studied were in good accord with that of the experiments. As a consequence, a thorough examination of fusion processes like He+U, Ca+Pb, and Ca+Pu demonstrates how quadrupole deformation simultaneously increases fusion and evaporation cross-sections. σER decreases with increasing hexadecapole deformation. Also, to comprehend the many facets of heavy-ion interactions of quadrupole and hexadecapole deformations of target nuclei, substantial deformation research in both theoretical and practical aspects is required.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"31 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140576299","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

Seebeck Effect of Dirac Electrons in Organic Conductors under Hydrostatic Pressure Using a Tight-Binding Model Derived from First Principles 利用从第一原理推导出的紧密结合模型研究静水压力下有机导体中狄拉克电子的塞贝克效应

IF 1.7 4区物理与天体物理

Journal of the Physical Society of Japan Pub Date : 2024-04-08 DOI: 10.7566/jpsj.93.054704

Yoshikazu Suzumura, Takao Tsumuraya, Masao Ogata

{"title":"Seebeck Effect of Dirac Electrons in Organic Conductors under Hydrostatic Pressure Using a Tight-Binding Model Derived from First Principles","authors":"Yoshikazu Suzumura, Takao Tsumuraya, Masao Ogata","doi":"10.7566/jpsj.93.054704","DOIUrl":"https://doi.org/10.7566/jpsj.93.054704","url":null,"abstract":"The Seebeck coefficient is examined for two-dimensional Dirac electrons in the three-quarter filled organic conductor α-(BEDT-TTF)2I3 [BEDT-TTF denotes bis(ethylenedithio)tetrathiafulvalene] under hydrostatic pressure, where the Seebeck coefficient S is proportional to the ratio of the thermoelectric conductivity L12 to the electrical conductivity L11, i.e., S = L12/TL11 with T being the temperature. We present an improved tight-binding model in two dimensions with transfer energies determined from first-principles density functional theory calculations with an experimentally determined crystal structure. The T dependence of the Seebeck coefficient is calculated by adding impurity and electron–phonon scatterings. Noting a zero-gap state due to the Dirac cone, which results in a competition from contributions between the conduction and valence bands, we show positive Sx and Sy at finite temperatures and analyze them in terms of spectral conductivity. The relevance of the calculated Sx (perpendicular to the molecular stacking axis) to the experiment is discussed.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"67 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140588767","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

Magnetic Phase Diagram and Skyrmions of the Hubbard Model on the β-Mn Type Lattice β-锰型晶格上哈伯德模型的磁相图和天线

IF 1.7 4区物理与天体物理

Journal of the Physical Society of Japan Pub Date : 2024-04-04 DOI: 10.7566/jpsj.93.054702

Yoshiro Kakehashi

引用次数: 0

Mottness and Spin Liquidity in a Doped Organic Superconductor κ-(BEDT-TTF)4Hg2.89Br8 掺杂有机超导体 κ-(BEDT-TTF)4Hg2.89Br8中的磁性和自旋流动性

IF 1.7 4区物理与天体物理

Journal of the Physical Society of Japan Pub Date : 2024-03-28 DOI: 10.7566/jpsj.93.042001

Hiroshi Oike, Hiromi Taniguchi, Kazuya Miyagawa, Kazushi Kanoda

{"title":"Mottness and Spin Liquidity in a Doped Organic Superconductor κ-(BEDT-TTF)4Hg2.89Br8","authors":"Hiroshi Oike, Hiromi Taniguchi, Kazuya Miyagawa, Kazushi Kanoda","doi":"10.7566/jpsj.93.042001","DOIUrl":"https://doi.org/10.7566/jpsj.93.042001","url":null,"abstract":"It has been more than 40 years since superconductivity was discovered in organic conductors, and the way scientists view organic superconductors has changed over time. First, the fact that organic conductors exhibit superconductivity was a novelty in itself, and subsequently, it was shown that behind the superconductivity is the physics of electron correlation, which has been a focus in condensed matter physics at large. Amid the marked development of correlation physics, the unique characteristics of organic conductors, e.g., a variety of lattice geometries and the highly compressible feature, led to the elucidation of fundamental principles and the finding of new phenomena, such as bandwidth-controlled Mott transitions and possible quantum spin liquids. However, most organic superconductors have commensurate band fillings, such as one-half or one-quarter, whereas inorganic superconductors, such as high-Tc cuprates and iron-based superconductors, have often been investigated under the variation of their band fillings. Thus, the physical linkage between organic and inorganic superconductors has remained unresolved. In this review article, we focus on the layered nonstoichiometric superconductor, κ-(BEDT-TTF)4Hg2.89Br8, which is exceptional among organic conductors in that the nonstoichiometry serves as doping to a half-filled band. Moreover, the strong correlation of electrons and a geometrically frustrated triangular lattice make this system exhibit the unique phenomena involved in Mottness, spin liquidity, and superconductivity, which are key concepts of correlated electron physics. This review will summarize what we learned from the pressure study of κ-(BEDT-TTF)4Hg2.89Br8 and how these findings relate to the extensively studied issues in inorganic materials.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140312223","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

Theory of Simultaneous Observation of Photoelectron and Emitted X-ray Photon in X-ray Emission Spectroscopy and Their Entanglement X 射线发射光谱中同时观测光电子和发射的 X 射线光子及其纠缠的理论

IF 1.7 4区物理与天体物理

Journal of the Physical Society of Japan Pub Date : 2024-03-27 DOI: 10.7566/jpsj.93.044401

Ryo B. Tanaka, Takayuki Uozumi

引用次数: 0

Field-induced Insulator–Metal Transition in EuTe2 场致 EuTe2 中的绝缘体-金属转变

IF 1.7 4区物理与天体物理

Journal of the Physical Society of Japan Pub Date : 2024-03-27 DOI: 10.7566/jpsj.93.044708

Tetsuya Takeuchi, Fuminori Honda, Dai Aoki, Yoshinori Haga, Takanori Kida, Yasuo Narumi, Masayuki Hagiwara, Koichi Kindo, Kosuke Karube, Hisatomo Harima, Yoshichika Ōnuki

{"title":"Field-induced Insulator–Metal Transition in EuTe2","authors":"Tetsuya Takeuchi, Fuminori Honda, Dai Aoki, Yoshinori Haga, Takanori Kida, Yasuo Narumi, Masayuki Hagiwara, Koichi Kindo, Kosuke Karube, Hisatomo Harima, Yoshichika Ōnuki","doi":"10.7566/jpsj.93.044708","DOIUrl":"https://doi.org/10.7566/jpsj.93.044708","url":null,"abstract":"We studied in detail the electrical and magnetic properties of the Eu-divalent antiferromagnet EuTe2 with a tetragonal crystal structure using single crystals grown by the Te self-flux method. The observed anisotropic magnetization curves in the antiferromagnetic state below TN = 11.1 K can be understood in terms of the magnetization processes of the two-sublattice model of an antiferromagnet with uniaxial magnetic anisotropy. A characteristic feature of this compound is that it becomes an insulator with decreasing temperature at zero magnetic field, but changes to a metal with a relatively low number of carriers in magnetic fields. From the results of magnetization, magnetoresistance, and Hall resistivity measurements in magnetic fields up to μ0H = 40 T, the insulator–metal transition was found to occur when the magnetization reaches ∼2 μB/Eu for both <tex-math space=\"preserve\" version=\"MathJax\">(Hparallel [110])</tex-math> and [001] at measurement temperatures above 50 K. Energy band calculations revealed that only the up-spin band, which is mainly composed of Te-5p electrons, crosses the Fermi level in the ferromagnetic state, although the energy band possesses a band gap in the paramagnetic and antiferromagnetic states.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"39 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140312075","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

Thermal Conductivity of Organic Solutions Against Solute Concentration 有机溶液的导热性与溶质浓度的关系

IF 1.7 4区物理与天体物理

Journal of the Physical Society of Japan Pub Date : 2024-03-25 DOI: 10.7566/jpsj.93.045002

Kaisei Nishitani, Yutaka Moritomo

引用次数: 0