Chinese Journal of Physics最新文献

{"title":"A universal representation for quantifying the significance of higher-order structures within networks under complex propagation mechanisms","authors":"Jiahui Song,&nbsp;Zaiwu Gong","doi":"10.1016/j.cjph.2025.04.012","DOIUrl":"10.1016/j.cjph.2025.04.012","url":null,"abstract":"<div><div>With the increasing complexity of epidemic propagation, traditional metrics for assessing critical components of networks often fail to adequately capture the higher-order structural characteristics of networks under complex propagation mechanisms. These higher-order features significantly influence the speed, scale, and pathways of propagation through synergistic reinforcement mechanisms. Based on existing complex propagation models, this study introduces the concept of “multiple infections” and constructs a universal representation method to quantify the importance of higher-order structures through the closure approximation of lower-order structures. The core innovation of this method lies in the introduction of an enhancement factor, which explicitly characterizes the nonlinear growth of propagation rates when infected nodes participate in higher-order interactions. Additionally, a probabilistic closure framework is proposed to transform the dynamic characteristics of higher-order structures into computable mathematical expressions, supporting the dimensionality reduction representation of higher-order structures at arbitrary scales. We specifically apply the proposed representation for quantifying the importance of higher-order structures to links and fully connected triplets (i.e., triangles), comparing it with existing metrics for link and triangle importance. By analyzing the degree of suppression of infection scale and complex propagation rates, the accuracy of identification, the efficiency of disrupting higher-order structures, and monotonicity, the superiority of the proposed quantification method is validated. The findings of this research contribute to a deeper understanding of the structural characteristics and dynamic behaviors of networks in the context of complex transmission. By introducing a generalized dynamic representation of higher-order structures, we provide researchers in fields such as network science, social network analysis, and transmission modeling with new insights and tools, thereby promoting further advancements in related areas and offering more reliable theoretical support for practical applications.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 919-938"},"PeriodicalIF":4.6,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Ultra-compact on-chip optical quantum circuit based on structured Si quantum logic gates","authors":"Huiqin Wang ,&nbsp;Meitong Dong ,&nbsp;Jiaxiang Li ,&nbsp;Nanrun Zhou ,&nbsp;Haoji Yang ,&nbsp;Xiaoyong Hu ,&nbsp;Heqing Xu","doi":"10.1016/j.cjph.2025.03.046","DOIUrl":"10.1016/j.cjph.2025.03.046","url":null,"abstract":"<div><div>Quantum circuits are common platforms for quantum computing and quantum information processing. However, the sizes of conventional quantum circuits are too large to be suitable for on-chip circuits. We present an intelligent reverse design methodology using a sequential quadratic program (SQP) for designing ultra-compact optical quantum logic gate (QLG) cells on chips. The single-qubit gates, including the Hadamard (H) gate and the Pauli-X gate, are designed whose sizes are 0.75 μm × 1.5 μm and 3.74 μm × 1.15 μm, respectively. Meanwhile, the two-qubit gates, including the controlled-NOT (CNOT) gate and the SWAP gate, are constructed from fundamental cells with footprints of 4.15 μm × 1.9 μm and 3.65 μm × 7.10 μm, respectively. The gates are the currently smallest QLGs reported by far. Furthermore, an optical quantum circuit has been integrated by cascading these logic gates, whose size is 10.18 μm × 4.15 μm, which is about several orders smaller than that of previous optical quantum circuits. It is expected that it can provide a new way to realize large-scale optical quantum circuits via the inverse design method.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 742-751"},"PeriodicalIF":4.6,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Manipulating non-Markovianity via bath's coherence in a collision model","authors":"Xiao-Ming Li,&nbsp;Zhong-Xiao Man,&nbsp;Yun-Jie Xia","doi":"10.1016/j.cjph.2025.04.018","DOIUrl":"10.1016/j.cjph.2025.04.018","url":null,"abstract":"<div><div>In this paper, we propose a structured collision model where the system qubit directly interacts with a nonthermal bath simulated by an ensemble of ancillas, and each ancilla consists of <em>N</em> correlated qubits. Based on this collision model, we systematically investigate the effects of three distinct types of coherence, namely displacement coherence in the single-qubit bath, along with squeezing and heat-exchange coherences in the two-qubit bath, on non-Markovianity in open quantum dynamics. The research findings demonstrate that injecting any of these three types of coherence into the environment can enhance the non-Markovianity in dynamics and make it more easily activated as long as the parameters (including the magnitude and phase of coherence) are appropriately selected. When the intracollision strength is relatively small, manipulating the coherence embedded in the bath can induce successive transitions of the system's dynamics between Markovian and non-Markovian regimes. In particular, we show that compared to the displacement coherence in the single-qubit bath, injecting the heat-exchange coherence or squeezing coherence into the two-qubit bath is more effective for improving the non-Markovianity.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 877-889"},"PeriodicalIF":4.6,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Numerical simulation of heat and mass transfer in non-Newtonian Casson nanofluids driven nonlinearly by a wedge-shaped stretching plate","authors":"Liang Zhang,&nbsp;Huimin Zhang","doi":"10.1016/j.cjph.2025.04.015","DOIUrl":"10.1016/j.cjph.2025.04.015","url":null,"abstract":"<div><div>In this paper, the heat mass transfer and entropy production of a non-Newtonian Casson nanofluid under the nonlinear motion of a wedge-shaped stretching plate are investigated. The effects of magnetic field, free flow velocity and porous medium are fully considered in the control equations. Then, the control equations are transformed into ordinary differential equations by using similar transformations, and the effects of dimensionless parameters on the momentum, heat and mass transfer and entropy production of the fluid are solved by using numerical solution methods. The results show that increasing both the magnetic field parameter and the Darcy parameter can effectively improve the heat transfer of the nanofluid, but at the expense of frictional resistance. It is also found that when the magnetic field strength and the velocity ratio parameter are increased, the Bejan number distribution shifts to the right overall, which can be explained by the increase in the proportion of entropy production due to heat transfer in the nanofluid system. This study theoretically deepens the understanding of non-Newtonian Casson nanofluid flow properties, and also provides a key theoretical basis for engineering applications such as heat exchanger design.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 939-961"},"PeriodicalIF":4.6,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"A neuron with asymmetric memristive channels and nonlinear membrane","authors":"Junen Jia,&nbsp;Chunni Wang,&nbsp;Guodong Ren","doi":"10.1016/j.cjph.2025.04.010","DOIUrl":"10.1016/j.cjph.2025.04.010","url":null,"abstract":"<div><div>Memristor-based branch circuits can present and estimate distinct field effect and then external physical field can be detected by monitoring the channel currents. The intracellular and extracellular ions have different passing probabilities across the cell membrane and thus appropriate gradient concentration is maintained to support suitable membrane potential and firing patterns under external stimulus. Therefore, it is worthy of presenting a reliable neuron model for discerning the permeability diversity of ions by connecting two different kinds of memristive channels, one controls the outer membrane while another controls the inner membrane, and the physical property of the media between inner and outer membrane is considered. In our study, two capacitors are connected via a nonlinear resistor, and two different memristors are used in the branch circuits for estimating the electrical activities during energy exchange. A two-capacitive neuron model with asymmetric memristive channels is obtained, and the energy characteristic is discussed after exact definition of the energy function. Noisy disturbance is applied for mimicking stochastic electromagnetic radiation on the neuron, and coherence resonance is detected and predicted by calculating the distribution of average energy with noise intensity in the neuron. Finally, field coupling via charge exchanges is activated to reveal the self-organization and pattern formation in the neural network, and the spatial patterns are controlled by the adaptive growth of membrane capacitance ratio for outer and inner membranes. Our suggested neuron model contains two memristive channels and double capacitive variables, and it is more suitable to match the physical property of biological neurons in presence of external electromagnetic field.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 978-994"},"PeriodicalIF":4.6,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Turning the magnetically dependent topological phase with electron correlation","authors":"Kunpeng Cai ,&nbsp;Yanqing Shen ,&nbsp;Xin Yang ,&nbsp;Xianghui Meng ,&nbsp;Yu Zhang ,&nbsp;Long Pang ,&nbsp;Peng E ,&nbsp;Zhongxiang Zhou","doi":"10.1016/j.cjph.2025.03.032","DOIUrl":"10.1016/j.cjph.2025.03.032","url":null,"abstract":"<div><div>In materials with unique structures and localized orbital distributions, electron correlation effects play a crucial role in determining their electronic properties. In the present work, we investigate the FeBrF monolayer through the Hubbard+<em>U</em> method to elucidate the underlying mechanisms linking electron correlation effects with magnetization-dependent topological phase transitions. The study demonstrates that electron correlation effects can significantly influence the Berry curvature, thereby driving topological phase transitions. The topologically protected edge states demonstrate robustness against magnetization angular variations. Even when the magnetization direction is close to the in-plane orientation, dissipationless chiral edge states can still be observed in the system. Our work provides new insights for the design of next-generation low-power electronic devices.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 662-673"},"PeriodicalIF":4.6,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143767685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Dynamic NiOx-based memristors for edge computing","authors":"Seoyoung Park ,&nbsp;Suyong Park ,&nbsp;Sungjun Kim","doi":"10.1016/j.cjph.2025.04.003","DOIUrl":"10.1016/j.cjph.2025.04.003","url":null,"abstract":"<div><div>Resistive random-access memory (RRAM) devices, which leverage resistance state modulation for data storage and retrieval, have garnered considerable interest due to their high-speed performance, low energy consumption, and exceptional scalability. These advanced characteristics make RRAM devices highly suitable for neuromorphic computing, a rapidly emerging paradigm aimed at developing autonomous systems capable of real-time learning, adaptation, and environmental interaction. In neuromorphic architecture, RRAM is increasingly viewed as a promising candidate for computing-in-memory. This research investigates the realization of neuromorphic systems by fine-tuning conductance using the DC sweep and electrical pulse on ITO/NiO_X/n^{+ +} Si stacked RRAM devices, based on their distinct resistance states. Key properties crucial for neuromorphic functionality, including Spike Amplitude-Dependent Plasticity (SADP), Spike Number-Dependent Plasticity (SNDP), Spike Duration-Dependent Plasticity (SDDP), were systematically examined. The potentiation and depression dynamics, along with the long-term plasticity characteristics demonstrated by the RRAM device, underscore its promising potential for neuromorphic applications. The demonstrated multi-state operational capability highlights the potential of the device for high-efficiency data processing and storage, which are essential for advanced edge computing architectures.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 803-813"},"PeriodicalIF":4.6,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Coupled effect of pressure corrections and heat-mass transfer on Rayleigh-Taylor instability in Casson fluid layer","authors":"Atul Kumar Shukla ,&nbsp;Mukesh Kumar Awasthi ,&nbsp;Dhananjay Yadav ,&nbsp;U.S. Mahabaleshwar","doi":"10.1016/j.cjph.2025.03.038","DOIUrl":"10.1016/j.cjph.2025.03.038","url":null,"abstract":"<div><div>This study explores the novel stability characteristics of the interface in a system composed of a viscous-Casson fluid, focusing on the coupled effects of heat and mass transfer. Extending the work of Awasthi et al. (Physics Fluids, 36 (2024) 102132), this investigation incorporates tangential viscous stresses into the interfacial dynamic condition, marking a departure from traditional potential flow theories. The model features a Casson fluid as the upper layer and a viscous fluid as the lower layer, with the analysis assuming no-slip conditions at rigid boundaries while the normal velocity is zero at these boundaries. A second-order polynomial equation is derived to characterize the growth rate, solved numerically using the Newton-Raphson method. Key findings demonstrate that heat and mass transfer enhance interface stability, with increased heat transport mitigating the destabilizing effects of the Atwood number. This theoretical advancement provides deeper insights into the dynamics of interfacial instability in complex fluid systems.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 962-977"},"PeriodicalIF":4.6,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"An innovative solution to the Mathieu-Van der Pol-Helmholtz-Duffing equation for the stability of superposed electrified Rivlin-Ericksen fluids","authors":"Yusry O. El-Dib ,&nbsp;Haifa A. Alyousef","doi":"10.1016/j.cjph.2025.03.044","DOIUrl":"10.1016/j.cjph.2025.03.044","url":null,"abstract":"<div><div>This paper presents a novel way to <strong>solve</strong> the Mathieu-Van der Pol-Helmholtz-Duffing equation to investigate the stability of superposed electrified Rivlin-Ericksen fluids. It focuses on the dynamics of surface waves propagating between two Rivlin-Ericksen elastic-viscous fluids under a vertical periodic electric field and relative streaming flow, revealing information about fluid interface stability and interactions. The analysis illustrates the delicate balance of forces that govern the system's behavior by combining surface tension, gravitational forces, and viscoelastic effects. Given the complexities of streaming flow, a mathematical simplification is used to increase analytical tractability. The boundary conditions account for viscoelasticity's effect, which greatly adds to the system's complexity. To assist analysis, the approximate equations of motion are first solved while ignoring viscoelastic effects, allowing for a preliminary understanding of the fundamental interactions between the periodic electric field, surface tension, and gravity. Once this baseline is created, viscoelastic effects are applied to capture the entire dynamics. The resulting nonlinear equation governing interfacial displacement, which is constructed as a nonlinear Mathieu-type equation and then simplified into a linearized form, allows for a detailed examination of stability and reveals areas of stability and instability. Numerical results show that characteristics such as the dielectric constant ratio, viscosity ratio, and viscoelasticity ratio all affect stability differently. Notably, the viscoelasticity coefficient causes destabilization in the nonlinear regime, emphasizing the complex interplay of forces in elastic-viscous fluid systems. This work contributes to a better understanding of complicated fluid interfaces, particularly under periodic electric excitation and viscoelastic effects.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 902-918"},"PeriodicalIF":4.6,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"An innovative methodology of inspecting nonlinear stability of a cylindrical interface separating two magnetic liquids","authors":"Asma Alanazy ,&nbsp;Galal M. Moatimid ,&nbsp;Yasmeen M. Mohamed","doi":"10.1016/j.cjph.2025.03.045","DOIUrl":"10.1016/j.cjph.2025.03.045","url":null,"abstract":"<div><div>Studying the nonlinear stability of a cylindrical interface between two magnetic liquids is novel due to its complex interaction of Magnetohydrodynamic (MHD) effects, interfacial deformations, and thermodynamic gradients, relevant to industrial applications and astrophysical phenomena. Consequently, this study examines the nonlinear stability of a cylindrical interface between two liquids in MHD, focusing on applications like MHD technologies, industrial processes, and geophysical inflows. The inner region contains a Power-law fluid (PLF), meanwhile, the outer one is filled by an Eyring-Powell fluid (EPF), both of them are immersed in a permeable medium under a uniform magnetic field (MF). Surface tension (ST), mass, and heat transfer (MHT) are analyzed employing Hsieh's streamlined formulation. To summarize the mathematical manipulation, the investigation utilizes the viscous potential theory (VPT), which simplifies calculations by regarding normal stress equilibrium, however ignoring shear stresses. Through quasi-static approximations of Maxwell's equations, a boundary-value problem is derived. Nonlinear boundary conditions (BCs) are established by linearizing the movement equations. A nonlinear ordinary differential equation (ODE) is converted into a linear one using He's frequency formula (HFF), which supports a novel procedure named the non-perturbative approach (NPA). Dimensionless quantities simplify the framework, revealing the impact of MFs, viscoelastic parameters, and Lorentz forces on interfacial performance. It is found that the Weber numbers, the linear factor of MHT as well as Darcy number have stabilized influences. The characteristic nonlinear ODE possesses real coefficients in the absence of the Weber number. The PolarPlot graphics demonstrate stability criteria, which remain reliable in both real and complex coefficients, except for variations in the transitional curve.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"95 ","pages":"Pages 1222-1249"},"PeriodicalIF":4.6,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143899388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}