Chinese Journal of Physics最新文献

Chaos in a triple diffusive system involving a viscoelastic fluid layer 涉及粘弹性流体层的三重扩散系统中的混沌

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2026-06-01 Epub Date: 2026-01-29 DOI: 10.1016/j.cjph.2026.01.024

N.D. Pavan , S. Pranesh , P.G. Siddheshwar

{"title":"Chaos in a triple diffusive system involving a viscoelastic fluid layer","authors":"N.D. Pavan , S. Pranesh , P.G. Siddheshwar","doi":"10.1016/j.cjph.2026.01.024","DOIUrl":"10.1016/j.cjph.2026.01.024","url":null,"abstract":"<div><div>This study investigates the linear and weakly nonlinear stability analysis in a Rayleigh-Bénard configuration with a viscoelastic fluid layer influenced by two additional solutal components. The governing equations for both stationary and oscillatory convective regimes, and the critical point at which convection sets in is derived. The comparative analysis is performed for three different viscoelastic fluid models: Oldroyd-B, Maxwell, Rivlin-Ericksen fluid, along with the Newtonian fluid model. In weakly nonlinear stability analysis, a generalized eight-mode Lorenz model is developed that satisfies the general properties of a classical Lorenz model. From this reduced model, the critical points and Hopf-Rayleigh number, representing the initiation of chaos through Hopf bifurcation are determined. The Lyapunov exponents are used to characterize the chaotic, periodic and quasi-periodic motions of the system. The results show that the viscoelastic and triple diffusion parameters affect the initiation of convection and transition to chaos. It is also observed that the Maxwell fluid exhibits the earliest initiation of chaos and the Newtonian fluid the latest, with Oldroyd-B and Rivlin-Ericksen exhibiting intermediate behaviour. The presence of additional solutal concentrations delays the onset of chaotic motion.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"101 ","pages":"Pages 57-79"},"PeriodicalIF":4.6,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187192","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}

引用次数: 0

Thermodynamic performance of a quantum Stirling heat engine in Lipkin-Meshkov-Glick model with magnetic field 具有磁场的Lipkin-Meshkov-Glick模型中量子斯特林热机的热力学性能

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2026-06-01 Epub Date: 2025-12-04 DOI: 10.1016/j.cjph.2025.12.005

Feilang Ning , Chengjian Yang , Liu Long

{"title":"Thermodynamic performance of a quantum Stirling heat engine in Lipkin-Meshkov-Glick model with magnetic field","authors":"Feilang Ning , Chengjian Yang , Liu Long","doi":"10.1016/j.cjph.2025.12.005","DOIUrl":"10.1016/j.cjph.2025.12.005","url":null,"abstract":"<div><div>This paper explores the quantum Stirling cycle with a working medium modeled by the two-sided Lipkin-Meshkov-Glick (LMG) model under the influence of an external magnetic field and a symmetric cross-interaction. Shannon entropy is then used to derive the necessary quantities for analyzing the quantum Stirling heat engine, and its four-stage cycle is examined using the introduced quantum working medium. Subsequently, the efficiency and thermodynamic performance are calculated based on the established relations. Three scenarios are considered: the anisotropic XY model, the Ising model, and the mixed ferromagnetic model. The findings demonstrate that the Stirling cycle can function as a refrigerator, accelerator, heat engine, or heater, with its operational mode highly tunable via external parameters, including the magnetic field, the anisotropy parameter, the temperature ratio of the heat baths, and the ratio of the magnetic coupling strengths. Transitions between these regimes are governed by quantum fluctuations, anisotropy effects, and thermal gradients. The efficiency and thermodynamic performance of the cycle are analyzed under variation of these parameters. These insights provide a foundation for optimizing quantum thermal devices for energy conversion and refrigeration applications.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"101 ","pages":"Pages 80-93"},"PeriodicalIF":4.6,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187193","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}

引用次数: 0

Optical aspect of cosmological black holes in Einstein-Maxwell-dilaton theory 爱因斯坦-麦克斯韦膨胀理论中宇宙学黑洞的光学方面

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2026-06-01 Epub Date: 2025-11-03 DOI: 10.1016/j.cjph.2025.10.032

Hajar Belmahi , Amin Mohamed Rbah

{"title":"Optical aspect of cosmological black holes in Einstein-Maxwell-dilaton theory","authors":"Hajar Belmahi , Amin Mohamed Rbah","doi":"10.1016/j.cjph.2025.10.032","DOIUrl":"10.1016/j.cjph.2025.10.032","url":null,"abstract":"<div><div>Motivated by string theory scenarios, we study the optical aspect of AdS black holes in Einstein-Maxwell-dilaton theory. Concretely, we investigate and examine the shadows and the deflection angle of light rays by such cosmological black holes. Regarding the shadows, we first deal with the non-rotating solutions. As expected, we obtain perfect circular shadows where their sizes are controlled by the involved parameters including the charge and the cosmological constant. Combining the Newman-Janis formalism and the Hamilton-Jacobi algorithm, we approach the rotating black hole shadows using one dimensional real curves. Among others, we observe that the size and the shape of the shadows depend on certain parameters such as the rotation parameter. To make contact with the Event Horizon Telescope observational data, we show that certain constraints should be imposed on such parameters. Then, we study the behaviors of the light rays near such cosmological black holes by computing the deflection angle in terms of the Einstein-Maxwell-dilaton theory parameters. Specifically, we reveal that the effect of the cosmological constant on the deflection angle depends on the coupling between the black hole parameters. Introducing the rotation parameter, we observe that this effect becomes similar to that of the cosmological constant in ordinary AdS black holes.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"101 ","pages":"Pages 33-46"},"PeriodicalIF":4.6,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146186881","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}

引用次数: 0

Extremal decomposable entanglement witnesses from limited local measurements in two-qudit systems 二量程系统中有限局部测量的极值可分解纠缠见证

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2026-06-01 Epub Date: 2025-12-29 DOI: 10.1016/j.cjph.2025.12.032

Yi-Fan Gao , Shu-Qian Shen , Ming Li , Lei Li , Shao-Ming Fei

引用次数: 0

A New Reduction Method to Find Rogue Waves of the Nonlinear Schro....dinger Equation 一种寻找非线性Schro异常波的新约简方法....谔方程

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2026-06-01 Epub Date: 2026-01-30 DOI: 10.1016/j.cjph.2026.01.022

Dazhao Lü , Yanying Cui , Xiufang Wang

{"title":"A New Reduction Method to Find Rogue Waves of the Nonlinear Schro....dinger Equation","authors":"Dazhao Lü , Yanying Cui , Xiufang Wang","doi":"10.1016/j.cjph.2026.01.022","DOIUrl":"10.1016/j.cjph.2026.01.022","url":null,"abstract":"<div><div>Rogue waves of the focusing nonlinear Schrödinger equation are obtained by a novel and highly efficient composite function reduction method. Compared to existing literatures, instead of the nonlinear differential operators <span><math><msup><mrow><mo>[</mo><mi>f</mi><mrow><mo>(</mo><msub><mi>p</mi><mi>i</mi></msub><mo>)</mo></mrow><mspace></mspace><msub><mi>∂</mi><msub><mi>p</mi><mi>i</mi></msub></msub><mo>]</mo></mrow><mi>k</mi></msup></math></span> and <span><math><msup><mrow><mo>[</mo><mi>f</mi><mrow><mo>(</mo><msub><mi>q</mi><mi>j</mi></msub><mo>)</mo></mrow><mspace></mspace><msub><mi>∂</mi><msub><mi>q</mi><mi>j</mi></msub></msub><mo>]</mo></mrow><mi>l</mi></msup></math></span>, the only linear differential operators <span><math><msubsup><mi>∂</mi><mrow><mi>λ</mi></mrow><mi>k</mi></msubsup></math></span> and <span><math><msubsup><mi>∂</mi><mrow><mi>μ</mi></mrow><mi>l</mi></msubsup></math></span> are used in this paper, which significantly simplify the computational process for deriving rogue waves and the analytical expressions of rogue waves. On the technical aspect, this research makes two key contributions to soliton theory. First, it broadens the applicability of the Grammian technique to a wider range by generalizing the constants <em>p<sub>i</sub></em> and <em>q<sub>j</sub></em> in the nonlinear dispersion relation to the functions <span><math><mrow><msub><mi>p</mi><mi>i</mi></msub><mo>=</mo><mi>h</mi><mrow><mo>(</mo><mi>λ</mi><mo>)</mo></mrow><mo>,</mo><mspace></mspace><msub><mi>q</mi><mi>j</mi></msub><mo>=</mo><mi>h</mi><mrow><mo>(</mo><mi>μ</mi><mo>)</mo></mrow></mrow></math></span>. Second, it adds diversity to the available reduction techniques in soliton theory by introducing the composite function reduction method.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"101 ","pages":"Pages 26-32"},"PeriodicalIF":4.6,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146135689","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}

引用次数: 0

Thermal radiation and salt finger-induced chaotic double-diffusive convection with concentration modulation along an inclined plane 热辐射与盐指沿斜面浓度调制的混沌双扩散对流

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2026-06-01 Epub Date: 2026-01-31 DOI: 10.1016/j.cjph.2026.01.026

Rohit Kannaujiya , B.S. Bhadauria

{"title":"Thermal radiation and salt finger-induced chaotic double-diffusive convection with concentration modulation along an inclined plane","authors":"Rohit Kannaujiya , B.S. Bhadauria","doi":"10.1016/j.cjph.2026.01.026","DOIUrl":"10.1016/j.cjph.2026.01.026","url":null,"abstract":"<div><div>The study examines the impact of time-dependent solute on an inclined plane under thermal radiation using an analytical approach. The ordinary differential equation, which is time dependent and non-autonomous, is used to frame the problem. The nonlinear theory and solvability condition are used to create the Ginzburg Landau equation. A nonlinear stability analysis of the stationary mode convection has been carried out and heat and mass transfer in terms of Sherwood number (<em>Sh</em>) and Nusselt number (<em>Nu</em>) are obtained. The Sherwood number (<em>Sh</em>) and Nusselt number (<em>Nu</em>) are found in terms of Rayleigh number, Lewis number, amplitude of convection, and analyzed graphically for various parameters of the system. The Lorenz model is employed to analyze chaotic convection near onset, showing transitions from steady to chaotic states. Flow patterns are visualized using streamlines, isotherms, and isohalines. In case of <strong>In-Phase Modulation</strong>, <em>ω</em> & <em>δ</em> have negligible effects while heat and mass transport increased in <strong>Out-phase and Upper Boundary Phase Modulation</strong>. Lewis number (<em>Le</em>) decreases the heat transfer while increasing the mass transfer due to the time-dependent concentration and surfaces concentrated from the above i.e. finger salt process. It is concluded that convection is less pronounced on the inclined surface compared to horizontal surface, which shows that <em>Nu</em> increases more quickly for horizontal fluid layer that it does for inclined fluid layer.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"101 ","pages":"Pages 1-25"},"PeriodicalIF":4.6,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146135687","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}

引用次数: 0

Electrically controlled laser generation in a photonic crystal - liquid crystal - metal microcavity 光子晶体-液晶-金属微腔的电控激光产生

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2026-04-01 Epub Date: 2026-01-07 DOI: 10.1016/j.cjph.2026.01.004

Daniil S. Buzin , Pavel S. Pankin , Dmitrii N. Maksimov , Vitaly S. Sutormin , Gavriil A. Romanenko , Rashid G. Bikbaev , Sergey V. Nedelin , Nikita A. Zolotovskii , Igor A. Tambasov , Stepan Ya. Vetrov , Kuo-Ping Chen , Ivan V. Timofeev

引用次数: 0

Tunable spin-wave resonance and chirality control in concentric nanotori for advanced spintronic applications 可调谐自旋波共振和手性控制在同心纳米环先进自旋电子学应用

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2026-04-01 Epub Date: 2026-01-01 DOI: 10.1016/j.cjph.2025.12.035

Eduardo Saavedra , Ulises J. Guevara , Carlos Saji , Tamara González-Vega , Pablo Díaz , Laura M. Pérez

{"title":"Tunable spin-wave resonance and chirality control in concentric nanotori for advanced spintronic applications","authors":"Eduardo Saavedra , Ulises J. Guevara , Carlos Saji , Tamara González-Vega , Pablo Díaz , Laura M. Pérez","doi":"10.1016/j.cjph.2025.12.035","DOIUrl":"10.1016/j.cjph.2025.12.035","url":null,"abstract":"<div><div>We investigate the spin-wave dynamics in concentric magnetic nanotori through micromagnetic simulations under perpendicular pulsed magnetic fields, using the free software MuMax3. These 3D nanostructures can host homochiral and heterochiral vortex configurations, whose spin-wave spectra strongly depend on the magnetostatic coupling parameter <em>δ</em>. In homochiral systems, resonance modes converge as <em>δ</em> increases, while in heterochiral systems, they diverge. Two distinct modes are identified: one associated with the outer surfaces of the tori and another with the inner torus. A central result is the demonstration of reversible transitions between homochiral and heterochiral vortex states using oscillating magnetic fields. The switching behavior and resonance properties vary with the coupling parameter <em>δ</em>, revealing the system’s dynamic versatility. This tunable chirality control positions concentric nanotori as promising candidates for future spintronic devices, enabling new opportunities for magnonic logic, non-volatile memory, and neuromorphic architectures. This work enhances the integration of 3D magnetic geometries with dynamic control, paving the way for applications in topological information processing and reconfigurable magnetic computing.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"100 ","pages":"Pages 95-102"},"PeriodicalIF":4.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146035643","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}

引用次数: 0

Multifield modulation of electronic structure in MoSi2N4/GeI2 van der Waals heterostructures MoSi2N4/GeI2范德华异质结构中电子结构的多场调制

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2026-04-01 Epub Date: 2025-12-26 DOI: 10.1016/j.cjph.2025.12.028

Yuanlei Zhao, Xuewen Wang, Yingying Zhao, Ting Zhu, Zhaoming Fu, Syed Awais Ahmad, Weibin Zhang, Quanhong Ou

{"title":"Multifield modulation of electronic structure in MoSi2N4/GeI2 van der Waals heterostructures","authors":"Yuanlei Zhao, Xuewen Wang, Yingying Zhao, Ting Zhu, Zhaoming Fu, Syed Awais Ahmad, Weibin Zhang, Quanhong Ou","doi":"10.1016/j.cjph.2025.12.028","DOIUrl":"10.1016/j.cjph.2025.12.028","url":null,"abstract":"<div><div>Through first-principles calculations, we systematically explored the evolution of the electronic structure of MoSi<sub>2</sub>N<sub>4</sub>/GeI<sub>2</sub> van der Waals heterostructure (vdWH) under biaxial strain, interlayer separation, and externally applied perpendicular electric fields. The pristine vdWH emerges as a direct-gap semiconductor with a bandgap of 1.69 eV. A compressive strain of 4% increases the bandgap to a maximum of 2.23 eV, whereas a tensile strain induces a precipitous reduction to 0.63 eV at 8%. Variations in interlayer spacing exert an equally pronounced influence: the bandgap broadens to 1.83 eV at 3.06 Å, but collapses abruptly to 0.16 eV upon further contraction to 1.56 Å. Perpendicular E-fields provide an additional lever of control; a modest field of -0.1 V Å<sup>-1</sup> elevates the bandgap to 1.85 eV, while stronger fields of -0.5 V Å<sup>-1</sup> quench the gap entirely, driving the system into a metallic state. The underlying mechanisms governing these bandgap modulations are elucidated in detail. Collectively, these results highlight the remarkable tunability of MoSi<sub>2</sub>N<sub>4</sub>/GeI<sub>2</sub> vdWH, thereby providing a theoretical framework for the rational conception of next-generation devices in the optoelectronic and flexible electronic domains.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"100 ","pages":"Pages 113-126"},"PeriodicalIF":4.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146035642","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}

引用次数: 0

Stellar modeling within regularized 4D Einstein-Gauss-Bonnet gravity in light of current astrophysical constraints 基于当前天体物理约束的正则四维爱因斯坦-高斯-邦尼引力下的恒星建模

IF 4.6 2区物理与天体物理

Chinese Journal of Physics Pub Date : 2026-04-01 Epub Date: 2025-12-31 DOI: 10.1016/j.cjph.2025.12.037

Grigorios Panotopoulos , Ángel Rincón , Ilidio Lopes

{"title":"Stellar modeling within regularized 4D Einstein-Gauss-Bonnet gravity in light of current astrophysical constraints","authors":"Grigorios Panotopoulos , Ángel Rincón , Ilidio Lopes","doi":"10.1016/j.cjph.2025.12.037","DOIUrl":"10.1016/j.cjph.2025.12.037","url":null,"abstract":"<div><div>In this study we obtain interior solutions and investigate structural properties of isotropic compact stars in the framework of four-dimensional regularized Einstein-Gauss-Bonnet (4DEGB) gravity. For stellar matter content, we adopt a widely used quark-matter model that approximates a realistic equation of state (EoS). By numerically integrating the modified Tolman-Oppenheimer-Volkoff equations, we obtain interior solutions for static, spherically symmetric fluid spheres. The resulting sequences are compared directly with the predictions of General Relativity (GR). Our analysis focuses on three diagnostic indicators: (i) the mass-radius profiles under GR and three representative choices of the Gauss-Bonnet coupling; (ii) the stellar compactness factor, <em>C</em> ≡ <em>M</em>/<em>R</em>; and (iii) the relation between stellar mass and central energy density. Recent observational studies suggest that the maximum masses inferred from the mass-radius relation may be larger than previously expected. To address this, we include a comparative set of constraints from multi-messenger astrophysical observations, including gravitational-wave event GW190814, as well as X-ray measurements from NICER for PSR J0740+6620 and PSR J0030+0451. These data provide stringent, astrophysically grounded tests of the viability of the models discussed here. Our results indicate that compact stars within 4DEGB gravity are systematically less compact and achieve moderately higher maximum masses compared to the GR case. This trend is consistent with recent theoretical analyses of compact stars in higher-curvature gravity theories and with constraints from multi-messenger astrophysics. Together, these findings suggest that regularized Gauss-Bonnet corrections constitute a plausible extension of GR in the strong-field regime.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"100 ","pages":"Pages 57-66"},"PeriodicalIF":4.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146035646","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}

引用次数: 0