Physical review. E最新文献_第4页

Discontinuous molecular dynamics simulations in an external field: Application to two-dimensional ferrofluids. 外场中的不连续分子动力学模拟：在二维铁磁流体中的应用。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2025-01-01 DOI: 10.1103/PhysRevE.111.L013301

Matthew A Dorsey, Carol K Hall

{"title":"Discontinuous molecular dynamics simulations in an external field: Application to two-dimensional ferrofluids.","authors":"Matthew A Dorsey, Carol K Hall","doi":"10.1103/PhysRevE.111.L013301","DOIUrl":"https://doi.org/10.1103/PhysRevE.111.L013301","url":null,"abstract":"We introduce a stochastic method for simulating the effect of an external magnetic field on coarse-grained models of magnetic colloids for use in discontinuous molecular dynamics (DMD) simulations. Our method for simulating an external field is illustrated with a coarse-grained model for magnetic squares in two dimensions. Square-shaped particles are represented as four disks bonded together in a 2×2 lattice configuration to create a hard colloidal geometry. Two opposite charges are embedded within the square to mimic the magnetic interactions between particles. The method for simulating an external field stochastically during DMD simulations operates by applying impulses randomly to the charges embedded within each square particle. When one square experiences an interaction with the field, each embedded charge within the square is assigned a new momentum with a specific magnitude and orientation. The magnitude of this momentum is equal to the average of a Maxwell-Boltzmann distribution at the simulation temperature. The orientation of the momentum depends on the charge, either positive or negative, and points either in the same or opposite direction as the field, respectively. The strength of the external field is determined by the average frequency at which the particles experience interactions with the field. The relationship between the stochastic frequency of the field and the field strength is derived from Newton's equation of motion. DMD simulations are performed for large systems of magnetic square particles at various temperatures and external field strengths. The simulation temperature is maintained constant with an Andersen thermostat, while the external field is simulated stochastically, as described above. We find that our simulation techniques reproduce a net system magnetization in close agreement with the two-dimensional equivalent of the Langevin function, while maintaining the simulation temperature constant.","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"111 1","pages":"L013301"},"PeriodicalIF":2.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143458797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Deviations from random-matrix entanglement statistics for kicked quantum chaotic spin-1/2 chains. 踢量子混沌自旋-1/2链的随机矩阵纠缠统计偏差。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2025-01-01 DOI: 10.1103/PhysRevE.111.L012104

Tabea Herrmann, Roland Brandau, Arnd Bäcker

引用次数: 0

Generative-machine-learning surrogate model of plasma turbulence. 等离子体湍流的生成机器学习代理模型。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2025-01-01 DOI: 10.1103/PhysRevE.111.L013202

B Clavier, D Zarzoso, D Del-Castillo-Negrete, E Frénod

引用次数: 0

Stochastic Kuramoto oscillators with inertia and higher-order interactions. 具有惯性和高阶相互作用的随机Kuramoto振子。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2025-01-01 DOI: 10.1103/PhysRevE.111.L012202

Priyanka Rajwani, Sarika Jalan

引用次数: 0

Explosive transition in adaptive Stuart-Landau oscillators with higher-order interactions. 具有高阶相互作用的自适应Stuart-Landau振子的爆炸跃迁。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2025-01-01 DOI: 10.1103/PhysRevE.111.014302

Umesh Kumar Verma

引用次数: 0

Yang-Lee zeros for real-space condensation. 实空间凝聚的Yang-Lee零。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2025-01-01 DOI: 10.1103/PhysRevE.111.L012101

Zdzislaw Burda, Desmond A Johnston, Mario Kieburg

引用次数: 0

Anomalous diffusion in the square soft Lorentz gas. 方形软洛伦兹气体中的反常扩散。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2025-01-01 DOI: 10.1103/PhysRevE.111.014216

Esko Toivonen, Joni Kaipainen, Matti Molkkari, Joonas Keski-Rahkonen, Rainer Klages, Esa Räsänen

{"title":"Anomalous diffusion in the square soft Lorentz gas.","authors":"Esko Toivonen, Joni Kaipainen, Matti Molkkari, Joonas Keski-Rahkonen, Rainer Klages, Esa Räsänen","doi":"10.1103/PhysRevE.111.014216","DOIUrl":"https://doi.org/10.1103/PhysRevE.111.014216","url":null,"abstract":"We demonstrate and analyze anomalous diffusion properties of point-like particles in a two-dimensional system with circular scatterers arranged in a square lattice and governed by smooth potentials, referred to as the square soft Lorentz gas. Our numerical simulations reveal a rich interplay of normal and anomalous diffusion depending on the system parameters. To describe diffusion in normal regimes, we develop a unit cell hopping model that, in the single-hop limit, recovers the Machta-Zwanzig approximation and converges toward the numerical diffusion coefficient as the number of hops increases. Anomalous diffusion is characterized by quasiballistic orbits forming Kolmogorov-Arnold-Moser islands in phase space, alongside a complex tongue structure in parameter space defined by the interscatterer distance and potential softness. The distributions of the particle displacement vector show notable similarities to both analytical and numerical results for a hard-wall square Lorentz gas, exhibiting Gaussian behavior in normal diffusion and long tails due to quasiballistic orbits in anomalous regimes. Our work thus provides a catalog of key dynamical system properties that characterize the intricate changes in diffusion when transitioning from hard billiards to soft potentials.","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"111 1-1","pages":"014216"},"PeriodicalIF":2.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143458933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Fractional Langevin equation far from equilibrium: Riemann-Liouville fractional Brownian motion, spurious nonergodicity, and aging. 远离平衡的分数朗格万方程：Riemann-Liouville分数布朗运动，伪非过能性和老化。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2025-01-01 DOI: 10.1103/PhysRevE.111.014128

Qing Wei, Wei Wang, Yifa Tang, Ralf Metzler, Aleksei Chechkin

{"title":"Fractional Langevin equation far from equilibrium: Riemann-Liouville fractional Brownian motion, spurious nonergodicity, and aging.","authors":"Qing Wei, Wei Wang, Yifa Tang, Ralf Metzler, Aleksei Chechkin","doi":"10.1103/PhysRevE.111.014128","DOIUrl":"https://doi.org/10.1103/PhysRevE.111.014128","url":null,"abstract":"We consider the fractional Langevin equation far from equilibrium (FLEFE) to describe stochastic dynamics which do not obey the fluctuation-dissipation theorem, unlike the conventional fractional Langevin equation (FLE). The solution of this equation is Riemann-Liouville fractional Brownian motion (RL-FBM), also known in the literature as FBM II. Spurious nonergodicity, stationarity, and aging properties of the solution are explored for all admissible values α>1/2 of the order α of the time-fractional Caputo derivative in the FLEFE. The increments of the process are asymptotically stationary. However when 1/2<α<3/2, the time-averaged mean-squared displacement (TAMSD) does not converge to the mean-squared displacement (MSD). Instead, it converges to the mean-squared increment (MSI) or structure function, leading to the phenomenon of spurious nonergodicity. When α≥3/2, the increments of FLEFE motion are nonergodic, however the higher order increments are asymptotically ergodic. We also discuss the aging effect in the FLEFE by investigating the influence of an aging time t_{a} on the MSD, TAMSD and autocovariance function of the increments. We find that under strong aging conditions the process becomes ergodic, and the increments become stationary in the domain 1/2<α<3/2.","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"111 1-1","pages":"014128"},"PeriodicalIF":2.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143458934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Strain on the upper surface of a perpendicularly peeled soft film. 垂直剥落的软膜上表面的张力。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2025-01-01 DOI: 10.1103/PhysRevE.111.015503

Yancheng Meng, Hui He, Jianqiang Zhang, Luxian Li

引用次数: 0

Systematic study of the role of dissipative environment in regulating entanglement and exciton delocalization in the Fenna-Matthews-Olson complex. Fenna-Matthews-Olson复合物中耗散环境在调控纠缠和激子离域中的作用的系统研究。

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2025-01-01 DOI: 10.1103/PhysRevE.111.014143

Luis E Herrera Rodríguez, Alexei A Kananenka

引用次数: 0