Physics Letters A最新文献_第10页

Variational quantum simulation of ground states and thermal states for lattice gauge theory with multi-objective optimization 晶格规范理论中基态和热态的多目标优化变分量子模拟

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-04-04 DOI: 10.1016/j.physleta.2025.130516

Lang-Xing Cheng , Dan-Bo Zhang

{"title":"Variational quantum simulation of ground states and thermal states for lattice gauge theory with multi-objective optimization","authors":"Lang-Xing Cheng , Dan-Bo Zhang","doi":"10.1016/j.physleta.2025.130516","DOIUrl":"10.1016/j.physleta.2025.130516","url":null,"abstract":"<div><div>Variational quantum algorithms provide feasible approaches for simulating quantum systems and are widely applied. For lattice gauge theory, however, variational quantum simulation faces a challenge as local gauge invariance enforces a constraint on the physical Hilbert space. In this paper, we incorporate multi-objective optimization for variational quantum simulation of lattice gauge theory at zero and finite temperatures. By setting energy or free energy of the system and penalty for enforcing the local gauge invariance as two objectives, the multi-objective optimization can self-adjust the proper weighting for two objectives and thus faithfully simulate the gauge theory in the physical Hilbert space. Specifically, we propose variational quantum eigensolver and variational quantum thermalizer for preparing the ground states and thermal states of lattice gauge theory, respectively. We demonstrate the quantum algorithms for a <span><math><msub><mrow><mi>Z</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> lattice gauge theory with spinless fermion in one dimension. With numeral simulations, the multi-objective optimization shows that minimizing energy (free energy) and enforcing the local gauge invariance can be achieved simultaneously at zero temperature (finite temperature). The multi-objective optimization suggests a feasible ingredient for quantum simulation of complicated physical systems on near-term quantum devices.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"546 ","pages":"Article 130516"},"PeriodicalIF":2.3,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143791251","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

Quantum droplet speed management and supersolid behavior in external harmonic confinement 外谐波约束下量子液滴速度管理和超固体行为

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-04-03 DOI: 10.1016/j.physleta.2025.130508

Saurab Das , Jayanta Bera , Ajay Nath

引用次数: 0

Exploring the effects of substitution site selectivity on structural transition and magnetocaloric effect in MnCoGe alloy 探讨取代位选择性对MnCoGe合金结构转变和磁热效应的影响

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-04-03 DOI: 10.1016/j.physleta.2025.130503

Hao Zhang, Lifu Bao, Xudong Zhang, Yongzhuo Sang, Yunzhe Ding, Jilong Gao, Danan Zhao, Hongwei Zhang, Ming Tian, Yuting Bai, Zhijie Li

{"title":"Exploring the effects of substitution site selectivity on structural transition and magnetocaloric effect in MnCoGe alloy","authors":"Hao Zhang, Lifu Bao, Xudong Zhang, Yongzhuo Sang, Yunzhe Ding, Jilong Gao, Danan Zhao, Hongwei Zhang, Ming Tian, Yuting Bai, Zhijie Li","doi":"10.1016/j.physleta.2025.130503","DOIUrl":"10.1016/j.physleta.2025.130503","url":null,"abstract":"<div><div>This study investigates the effects of Ga substitution at three distinct lattice sites (Mn, Co, Ge) in MnCoGe alloys to elucidate the relationship between substitution sites and phase transition regulation. The results demonstrate site-dependent efficiency in phase transition control: Ga substitution at Mn sites effectively lowers structural transition temperatures while enabling coupled magneto-structural transitions, causing the large magnetocaloric effects; substitution at Co sites exhibits the unusual capability to only tune the structural transition of cooling process into the Curie temperature window; conversely, substitution at Ge sites shows negligible phase transition modulation. These findings systematically map substitution site efficacy to transition tuning capabilities and their resultant MCE magnitudes, providing critical guidance for strategic site selection targeting enhanced magnetocaloric performance in solid-state refrigeration systems.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"545 ","pages":"Article 130503"},"PeriodicalIF":2.3,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759972","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

Exploring the depths of symmetries in the mKdV equation: Physical interpretations and multi-wave solutions 探索mKdV方程对称性的深度：物理解释和多波解

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-04-03 DOI: 10.1016/j.physleta.2025.130514

Xiazhi Hao , S.Y. Lou

{"title":"Exploring the depths of symmetries in the mKdV equation: Physical interpretations and multi-wave solutions","authors":"Xiazhi Hao , S.Y. Lou","doi":"10.1016/j.physleta.2025.130514","DOIUrl":"10.1016/j.physleta.2025.130514","url":null,"abstract":"<div><div>This manuscript embarks on an in-depth exploration of the modified Korteweg-de Vries (mKdV) equation, with a particular emphasis on unraveling the intricate structure of its infinite symmetries and their physical interpretations. Central to this investigation are the <em>K</em>-symmetries and <em>τ</em>-symmetries, which are delineated by a recursive relationship and constitute an infinite ensemble that underpins the conservation laws. We engage with an existing symmetry conjecture, which posits that the currently identified symmetries represent a subset of a more expansive, yet to be unearthed, set. This conjecture is substantiated through an analysis of the soliton solutions associated with the mKdV equation, demonstrating that these symmetries can be decomposed into linear combinations of center and wave number translational symmetries. Further, by imposing an infinite sequence of symmetry constraints, it becomes feasible to derive exact multi-wave solutions. This methodology, predicated on the proposed symmetry conjecture, facilitates the extraction of exact solutions, encompassing complexiton, breather, multi-soliton solutions, among others.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"546 ","pages":"Article 130514"},"PeriodicalIF":2.3,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143815392","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

Hartman-Grossman Hopf bifurcation control for traffic flow modelling of curves 交通流曲线建模的Hartman-Grossman Hopf分岔控制

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-04-02 DOI: 10.1016/j.physleta.2025.130493

WenHuan Ai, Xin Yang, GuoAo Li, YongHao Yang

{"title":"Hartman-Grossman Hopf bifurcation control for traffic flow modelling of curves","authors":"WenHuan Ai, Xin Yang, GuoAo Li, YongHao Yang","doi":"10.1016/j.physleta.2025.130493","DOIUrl":"10.1016/j.physleta.2025.130493","url":null,"abstract":"<div><div>Bifurcation analysis of the stochastic behaviour of complex traffic flow systems can provide an in-depth understanding of the causes of various traffic phenomena, while bifurcation control on the basis of bifurcation analysis can effectively alleviate traffic congestion. In this paper, we firstly introduces an extended Aw-Rascle model considering the bend factor, and convert it into a traffic flow stability model suitable for bifurcation analysis. Then the macro traffic flow model of this curve is subjected to bifurcation analysis, and its stability conditions and the existence conditions of various types of bifurcations are derived, and the changes of trajectories near the equilibrium point and their corresponding traffic phenomena are described by the phase plane diagram. Finally, the bifurcation characteristics of the system are modified by the design of the feedback controller, such that the bifurcations appearing at the equilibrium point in the control system are shifted forward, backward, or disappeared, so that the effect of preventing or alleviating traffic congestion can be achieved. It is shown that the controlled system model can be adjusted by adjusting the values of the controller parameters to achieve the bifurcation point forward and backward, so that the unstable bifurcation point disappears, and to control the amplitude of the limit cycle formed by the Hopf bifurcation to control the stability of the system, and thus the bifurcation in the curved roadway traffic flow model provides a decision support for the traffic management.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"546 ","pages":"Article 130493"},"PeriodicalIF":2.3,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143815391","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

Research on characteristics of partially coherent circularly polarized vortex beam in oceanic turbulence 海洋湍流中部分相干圆极化涡旋光束特性研究

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-04-02 DOI: 10.1016/j.physleta.2025.130513

Rui Cong, Dajun Liu, Yan Yin, Haiyang Zhong, Yaochuan Wang, Guiqiu Wang

引用次数: 0

The power of easy belief: How behaviors spread rapidly in two-layer networks 简单信念的力量：行为如何在两层网络中迅速传播

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-04-01 DOI: 10.1016/j.physleta.2025.130506

Zhujie Chu , Fengyu Zhou , Teng Sun , Xuzhen Zhu

引用次数: 0

Topic and opinion infused hypergraphs for influence maximization 主题和意见注入超图的影响最大化

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-04-01 DOI: 10.1016/j.physleta.2025.130507

Amartya Chakraborty, Nandini Mukherjee

引用次数: 0

Thermal transport in the long-range interactions Fermi-Pasta-Ulam model with weak interface 具有弱界面的Fermi-Pasta-Ulam模型中远距离相互作用的热输运

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-04-01 DOI: 10.1016/j.physleta.2025.130504

Qiang Zhang, Yu Xue, Kun Zhang, Haojie Luo

{"title":"Thermal transport in the long-range interactions Fermi-Pasta-Ulam model with weak interface","authors":"Qiang Zhang, Yu Xue, Kun Zhang, Haojie Luo","doi":"10.1016/j.physleta.2025.130504","DOIUrl":"10.1016/j.physleta.2025.130504","url":null,"abstract":"<div><div>We investigate the thermal transport properties of a one-dimensional long-range Fermi-Pasta-Ulam (β-FPU) model with the inclusion of a weak interface. The system comprises two nonlinear long-range FPU chains connected via a linear weak interface. The weak interface is modeled using linear harmonic interactions. The equations of motion were simulated using molecular dynamics, enabling the calculation of thermal transport quantities, including heat flux J, thermal conductivity κ, and the local temperature distribution T<sub>i</sub>. Furthermore, an analysis of finite-size effects was conducted. Our analysis reveals distinct thermal transport behaviors governed by a critical value of δ, which marks a transition in the heat flux and thermal conductivity. This critical δ depends on the coupling strength of the interface k<sub>int</sub>; for instance, δ=5.0 is observed when k<sub>int</sub>=0.1. This threshold delineates two regimes of thermal conductivity: monotonic growth for δ<δ<sub>c</sub> and stabilization for δ>δ<sub>c</sub>. Notably, for a system without an interface, thermal conductivity peaks at δ=2.0. On the other hand, we also observed a scaling behavior of the heat flux J∝k<sub>int</sub>, which is consistent with previous studies. To elucidate the underlying mechanisms of this behavior, we calculate the mean standard deviation σ of the local heat fluxes J<sub>i</sub>, which provides a consistent explanation for the observed critical phenomena in both heat flux and thermal conductivity.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"545 ","pages":"Article 130504"},"PeriodicalIF":2.3,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747070","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

Light polarization effect on the extinction spectrum of silver nanostructures 光偏振效应对银纳米结构消光光谱的影响

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-04-01 DOI: 10.1016/j.physleta.2025.130509

Samaya El Samad , Maher Jneid , Hanaa El Badawi Yassine , Salem Marhaba

{"title":"Light polarization effect on the extinction spectrum of silver nanostructures","authors":"Samaya El Samad , Maher Jneid , Hanaa El Badawi Yassine , Salem Marhaba","doi":"10.1016/j.physleta.2025.130509","DOIUrl":"10.1016/j.physleta.2025.130509","url":null,"abstract":"<div><div>The optical properties of metal nanostructures especially the localized surface plasmon resonances (LSPRs) have been intensively investigated in recent times. In this paper, we explore the resonance behavior for various arrangement of silver (Ag) nanostructures characterized by far field optical spectroscopy in the visible and near-infrared regions of the electromagnetic waves. Depending on the light polarization and nanostructure morphology, extinction cross section spectrum displays multipolar resonance modes. Furthermore, plasmonic coupling within the nanostructure results in a strong increase in the optical response magnitude, accompanied by a spectral position redshift. Using transmission electron microscopy (TEM) images, the nanostructures morphologies are redesigned by Comsol Multiphysics. The optical response of the nanostructures recorded from measurements and modeling based on Finite Element Method (FEM) provides a very good agreement. Knowing the optical response of these nanostructures and exploiting the generation of plasmonic field enhancement, opens applications on several domains such as sensors and imaging.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"546 ","pages":"Article 130509"},"PeriodicalIF":2.3,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143783899","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