Chinese Journal of Physics最新文献

{"title":"Linear and nonlinear stability analysis of double-diffusive nanofluid convection in an inclined porous medium with Forchheimer drag","authors":"Ghulam Rasool ,&nbsp;Muhammad Ijaz Khan ,&nbsp;F.F. Al-Harbi","doi":"10.1016/j.cjph.2025.10.023","DOIUrl":"10.1016/j.cjph.2025.10.023","url":null,"abstract":"<div><div>This study presents an extended linear and nonlinear stability analysis of double-diffusive nanofluid convection in an inclined porous medium, incorporating nonlinear inertial effects via the Forchheimer drag term. The governing equations are formulated using a generalized Darcy-Forchheimer model with thermal and solutal buoyancy forces projected along the inclined axis. Linear stability is assessed via a normal mode analysis, leading to a generalized eigenvalue problem solved numerically using finite difference discretization. Nonlinear energy stability is investigated through an integral energy method, yielding conservative thresholds for the onset of convective instability. Comprehensive parametric studies reveal the influence of Darcy number, Lewis number, and inclination angle on both thermal and solutal Rayleigh thresholds. Results show that nonlinear thresholds exhibit sharp maxima near <span><math><mrow><mi>β</mi><mo>=</mo><msup><mn>90</mn><mo>∘</mo></msup></mrow></math></span>, highlighting the geometric suppression of vertical buoyancy. The Forchheimer term consistently enhances stability, especially at low permeability and high inclination. These insights are critical for thermal management and flow control in porous-layer energy systems.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"100 ","pages":"Pages 289-307"},"PeriodicalIF":4.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146074730","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":"Unveiling the impact of bonding asymmetry on the lattice thermal conductivity of MnXS2Cl (X=Sb, Bi) for promising thermoelectric applications","authors":"Suiting Ning ,&nbsp;Ziye Zhang ,&nbsp;Xiaochen Liu ,&nbsp;Zhiquan Chen","doi":"10.1016/j.cjph.2026.01.018","DOIUrl":"10.1016/j.cjph.2026.01.018","url":null,"abstract":"<div><div>Both anharmonicity and phonon scattering have significant effects on the lattice thermal conductivity of materials. Through the calculation on the double-anion chalcohalides MnXS₂Cl (X=Sb,Bi), it is found that both MnSbS₂Cl and MnBiS₂Cl exhibit low intrinsic lattice thermal conductivity, which are only 0.40 and 0.46 W m<span><math><msup><mrow></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span> K<span><math><msup><mrow></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span> at 300 K, respectively. In order to clarify the origin of the low lattice thermal conductivity in this kind of material, the phonon correlation quantities are analyzed in detail by the phonon Boltzmann transport theory. It is discovered that the presence of double-anion causes distortion in the crystal structure and the asymmetry in chemical bonding. The bonding asymmetry leads to strong coupling between acoustic-optical branches and therefore more phonon scattering processes, decreasing the phonon relaxation time. The weak X-Cl bonding also leads to low phonon group velocity. These two factors greatly reduce the lattice thermal conductivity of the MnXS₂Cl compounds. In addition, due to the more suitable carrier effective mass and the achievement of band convergence in the conduction band, MnXS₂Cl exhibits superior electronic transport properties for n-type materials. Combined with the low intrinsic lattice thermal conductivity, the optimal <em>ZT</em> value of MnSbS₂Cl can reach 2.7 at 800 K, indicating that it has excellent thermoelectric performance. This study provides a theoretical basis for elucidating the thermal conductivity characteristics of mixed-anion chalcohalides, and demonstrates the potential applications of such materials in the thermoelectric field.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"100 ","pages":"Pages 236-246"},"PeriodicalIF":4.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146074725","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":"Global stability analysis of double-diffusive convection in an inclined porous layer with chemical reaction using a thermal non-equilibrium model","authors":"Bhagya Mathapati ,&nbsp;Ravi Ragoju ,&nbsp;Dhananjay Yadav ,&nbsp;Kuppalapalle Vajravelu","doi":"10.1016/j.cjph.2026.01.002","DOIUrl":"10.1016/j.cjph.2026.01.002","url":null,"abstract":"<div><div>The thermosolutal convection in an inclined porous medium using a local thermal non-equilibrium (LTNE) model with chemical reaction is investigated, which has valuable applications in geophysical and industrial sectors, particularly in subsurface energy extraction and chemical processing. Linear and nonlinear analyses are employed to study the stability of the system. Linear instability is examined through the normal mode, nonlinear stability is analyzed using the energy method by constructing a generalized energy functional. The bvp4c routine in MATLAB R2023a is used to solve the eigenvalue problem. The study evaluates the effect of non-dimensional parameters, including the porosity-modified conductivity ratio (<em>τ</em>), the Damkohler number (<em>Dm</em>), the inter-phase heat transfer parameter (<em>H</em>), the Lewis number (<em>Le</em>), and the solutal Rayleigh number (<em>Rs</em>). The results from this study show that, increasing the inclination angle, <em>Le</em>, and <em>H</em>, increases the critical thermal Rayleigh number, enhancing system stability. On the other hand, the Damkohler number destabilizes the fluid flow. A noteworthy observation is that the suppression of transverse roll structure is governed by the magnitude of the <em>Le</em>. Additionally, while the increase in <em>Le</em> and <em>Rs</em>, the critical Rayleigh value increases in the linear case but decreases in the nonlinear case, which causes the subcritical region to expand.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"100 ","pages":"Pages 10-22"},"PeriodicalIF":4.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975511","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":"Role of asymmetry and deformation parameters in the population of high spin states associated with incomplete fusion","authors":"Amritraj Mahato ,&nbsp;Dharmendra Singh ,&nbsp;Pankaj K. Giri ,&nbsp;Nitin Sharma ,&nbsp;Harish Kumar ,&nbsp;Rahbar Ali ,&nbsp;R. Tripathi ,&nbsp;S.S. Ghugre ,&nbsp;M. Afzal Ansari ,&nbsp;R. Kumar ,&nbsp;S. Muralithar ,&nbsp;R.P. Singh","doi":"10.1016/j.cjph.2026.01.011","DOIUrl":"10.1016/j.cjph.2026.01.011","url":null,"abstract":"<div><div>The spin distributions of different evaporation residues produced in the system ¹⁹F + ¹⁵⁴Sm have been measured at an energy of  ≈ 6 MeV/nucleon. The measured spin distributions and feeding intensity patterns of complete and incomplete fusion channels are found to be entirely different, indicating their population through different reaction routes. The results obtained from the measured data suggest the incomplete fusion observed in the interaction of ¹⁹F projectile with ¹⁵⁴Sm target has a peripheral nature. The measured spin distributions of <em>α</em> emitting channels in the forward angular zone provide an experimental signature of the breakup of ¹⁹F projectile. The influence of the mass and charge asymmetries of the entrance channel as well as the deformations of the projectile and target, on the average angular momentum ( &lt; ℓ &gt; ) values imparted in the system has also been investigated. The ( &lt; ℓ &gt; ) values associated with complete and incomplete fusion channels were found to be significantly influenced by the asymmetry parameters and the deformations of the projectile and target. These results include the identification of certain degrees of freedom, like the asymmetry and deformation of the entrance channel in the population of high-spin states. The present systematic study provides experimental evidence for the localization of CF and successive ICF channels in successive angular momentum windows as proposed in the Sumrule model for a wide range of systems and variable projectile and target deformations.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"100 ","pages":"Pages 208-225"},"PeriodicalIF":4.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146074621","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":"Kármán vortex street in a discrete quasi-2D Bose-Einstein condensate","authors":"Bao-Long Xi ,&nbsp;Xiao-Bei Fan ,&nbsp;Kai-Hua Shao ,&nbsp;Pu Tu ,&nbsp;Xi Zhao ,&nbsp;Zhong-Hong Xi ,&nbsp;Rui-Ming Su ,&nbsp;Jin-Ping Ma ,&nbsp;Yu-Ren Shi","doi":"10.1016/j.cjph.2026.01.017","DOIUrl":"10.1016/j.cjph.2026.01.017","url":null,"abstract":"<div><div>The dynamical behaviors of a discrete quasi-2D Bose-Einstein condensate (BEC) through a moving obstacle potential are investigated numerically. Under various discrete strengths, four special vortex arrangement patterns are discovered, namely symmetrical double-row wake, oblique drift wake, V-shaped wake and Kármán vortex street. The Kármán vortex street, which consists of periodic antisymmetric double row vortex pairs, occurs in discrete BEC when the width and velocity of the obstacle potential reach an appropriate value. It can be noted that the stability condition for vortex streets in discrete BEC is smaller than that (0.28) for vortex streets in classical fluids, and it approaches 0.28 as the discrete intensity increases. The results show that the velocity of the obstacle potential required to form the Kármán vortex street increases with the increase of discrete intensity. As the discrete strength increases from 4 to 8, the parameter region where the vortex street appears in the <span><math><mrow><mi>d</mi><mspace></mspace><mo>−</mo><mspace></mspace><mi>v</mi></mrow></math></span> phase diagram manifests as several discrete and independent domains. The intrinsic mechanism related to the formation of wake flow was analyzed in detail by calculating the drag force on the obstacle potential. Notably, the vertical component of the drag force exhibits sinusoidal oscillations when the wake is a Kármán vortex street, which can be used to calculate the shedding frequency of vortex pairs in the vortex street.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"100 ","pages":"Pages 226-235"},"PeriodicalIF":4.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146074733","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":"Quantum hydrodynamic modeling of nonlinear wave interactions","authors":"Kolade M. Owolabi","doi":"10.1016/j.cjph.2025.12.034","DOIUrl":"10.1016/j.cjph.2025.12.034","url":null,"abstract":"<div><div>Quantum hydrodynamic (QHD) models provide a self-consistent framework for describing the evolution of particle density and velocity fields in quantum systems, incorporating both classical and purely quantum dispersive effects. In this work, we analyze nonlinear wave interactions by deriving QHD equations from the nonlinear Schrödinger formalism and investigating their dynamical properties. We establish rigorous analytical results, including conservation laws, existence of weak solutions, and nonlinear stability of energy-minimizing states. Complementary numerical simulations using Fourier spectral methods combined with exponential time-stepping reveal rich nonlinear phenomena such as stationary solitons, breather formation, and quasi-elastic collisions, confirming theoretical predictions. The results demonstrate the applicability of QHD models to a variety of physical settings, including quantum plasmas, nonlinear optical media, and Bose–Einstein condensates, providing insights into both fundamental dynamics and potential technological applications.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"100 ","pages":"Pages 67-94"},"PeriodicalIF":4.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146035645","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":"Quantum-correlation enhancement in cavity-magnon optomechanical hybrid systems mediated by a coherent feedback loop","authors":"Ya-Qin Lin ,&nbsp;Yue-Han Lin ,&nbsp;Rong-Can Yang ,&nbsp;Hong-Yu Liu","doi":"10.1016/j.cjph.2025.12.039","DOIUrl":"10.1016/j.cjph.2025.12.039","url":null,"abstract":"<div><div>Magnonics-based hybrid quantum systems have emerged as a critical platform for investigating diverse quantum correlation phenomena. In this paper, we propose a cavity-magnon optomechanical hybrid system integrated with a coherent feedback loop to enhance quantum correlations. Unlike previous schemes, GHz-band magnon and MHz-band mechanical modes in our proposal are not directly coupled, enabling the easier independent quantum control over subsystems. Moreover, the theoretical analysis and numerical simulations illustrate that the introduced feedback loop can not only significantly amplify quantum correlations but also enhance thermal stability relative to conventional configurations. Such enhancement of quantum correlations may pave the way for advancements in quantum precision measurement and quantum communication technologies.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"100 ","pages":"Pages 39-46"},"PeriodicalIF":4.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975510","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":"Large magnetoresistance and nonvolatile multi-level memory in VSi2N4/MoSiGeN4/VSi2N4 magnetic tunnel junctions","authors":"Jing-Run Wei,&nbsp;Wei-Kang Zhang,&nbsp;Zong-Liang Li,&nbsp;Chuan-Kui Wang,&nbsp;Xiao-Xiao Fu","doi":"10.1016/j.cjph.2026.01.006","DOIUrl":"10.1016/j.cjph.2026.01.006","url":null,"abstract":"<div><div>Constructing two-dimensional van der Waals magnetic tunnel junctions with the giant tunneling magnetoresistance effect is crucial towards miniaturized spintronic devices. Herein, we introduce a two-dimensional van der Waals magnetic tunnel junction based on the VSi₂N₄ half-metal and the Janus MoSiGeN₄ semiconductor material, and comprehensively investigate the spintronic transport properties by using density functional theory combined with the non-equilibrium Green's function method. A spin filtering efficiency close to 100% is achieved for the VSi₂N₄/MoSiGeN₄/VSi₂N₄ magnetic tunnel junction with a parallel magnetic configuration, and, surprisingly, a large tunnel magnetoresistance ratio is obtained. Due to the intrinsic dipole moment of Janus MoSiGeN₄, a large tunnel dipole-induced resistance ratio of 6999% is observed in the VSi₂N₄/bilayer-MoSiGeN₄/VSi₂N₄ van der Waals magnetic tunnel junction at zero bias voltage, and it can be further improved by tuning the bias voltage. Importantly, the high spin filtering efficiency and the large tunneling magnetoresistance ratios are maintained throughout the entire bias voltage range. The large tunneling magnetoresistance effect is attributed to the absence of electron states in both spin-conducting channels near the Fermi level in the antiparallel magnetic configuration. Subsequently, we classify the six distinct magnetic and electric combinations of the magnetic tunnel junctions into four distinguishable storage states. Multilevel data storage is thereby achieved through the cooperative control of magnetic and electrical switching. We demonstrate that the VSi₂N₄/MoSiGeN₄/VSi₂N₄ and VSi₂N₄/bilayer-MoSiGeN₄/VSi₂N₄ van der Waals magnetic tunnel junctions are promising candidates for next-generation spintronic devices.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"100 ","pages":"Pages 47-56"},"PeriodicalIF":4.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975515","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":"Normal Shock Wave Propagation in Magnetized Turbulent Flow Using Analytical and Neural Network","authors":"Tanya Srivastava ,&nbsp;Nilam VenkataKoteswararao","doi":"10.1016/j.cjph.2025.12.022","DOIUrl":"10.1016/j.cjph.2025.12.022","url":null,"abstract":"<div><div>A parametric study is done to investigate the change in fluid properties due to normal shock wave and turbulent flow interaction, taking into account the influence of the magnetic field. These effects are significant for the development of plasma propulsion systems, compressible fluid dynamics and aerospace technologies. A modified Rankine–Hugoniot model has been developed in order to accomplish this. The analysis begins with the derivation of governing equations that include the effects of the magnetic field for compressible and turbulent flow. The analysis has been enhanced further by using Artificial Neural Network techniques to predict Mach number and shock strength using a back-propagation algorithm that has been optimised using the Levenberg–Marquardt method. Turbulence intensity and magnetic fields significantly affect the compression process across the shock and downstream flow characteristics, leading to variations in density, velocity and Mach number ratios. These results offer new perspectives for the design and efficiency of high-speed flow systems and offer important insights into the dynamics of shocks in magnetised turbulent environments.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"100 ","pages":"Pages 23-38"},"PeriodicalIF":4.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975516","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":"Full three-dimensional particle-In-Cell simulation for phase-matched ion-based high-order harmonic generation in water-window X-ray","authors":"Ying-Shan Chen ,&nbsp;Hsu-Hsin Chu ,&nbsp;Shih-Hung Chen ,&nbsp;Yao-Li Liu","doi":"10.1016/j.cjph.2025.12.033","DOIUrl":"10.1016/j.cjph.2025.12.033","url":null,"abstract":"<div><div>We perform a full three-dimensional particle-in-cell (3D-PIC) simulation to investigate a phase-matching scheme of ion-based high-order harmonic generation (HHG). A high-intensity laser pulse ( ∼ 10¹⁶ W/cm², 405-nm wavelength, 50-fs pulse duration) is employed to produce He<span><math><msup><mrow></mrow><mrow><mn>1</mn><mo>+</mo></mrow></msup></math></span> ions as the interacting medium for extending the cutoff photon energy to the water-window X-ray spectral region. The simulation result shows that phase matching for the 179^th harmonic (2.26nm) is achieved by compensating the positive dipole phase with negative plasma and geometric phase shifts through laser divergence control. The relative conversion efficiency can be higher than 91% of the value with the ideal phase-matching condition.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"99 ","pages":"Pages 588-599"},"PeriodicalIF":4.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145920904","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}